/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* The <code>String</code> class represents character strings. All
* string literals in Java programs, such as <code>"abc"</code>, are
* implemented as instances of this class.
* <p>
* Strings are constant; their values cannot be changed after they
* are created. String buffers support mutable strings.
* Because String objects are immutable they can be shared. For example:
* <p><blockquote><pre>
* String str = "abc";
* </pre></blockquote><p>
* is equivalent to:
* <p><blockquote><pre>
* char data[] = {'a', 'b', 'c'};
* String str = new String(data);
* </pre></blockquote><p>
* Here are some more examples of how strings can be used:
* <p><blockquote><pre>
* System.out.println("abc");
* String cde = "cde";
* System.out.println("abc" + cde);
* String c = "abc".substring(2,3);
* String d = cde.substring(1, 2);
* </pre></blockquote>
* <p>
* The class <code>String</code> includes methods for examining
* individual characters of the sequence, for comparing strings, for
* searching strings, for extracting substrings, and for creating a
* copy of a string with all characters translated to uppercase or to
* lowercase. Case mapping is based on the Unicode Standard version
* specified by the {@link java.lang.Character Character} class.
* <p>
* The Java language provides special support for the string
* concatenation operator ( + ), and for conversion of
* other objects to strings. String concatenation is implemented
* through the <code>StringBuilder</code>(or <code>StringBuffer</code>)
* class and its <code>append</code> method.
* String conversions are implemented through the method
* <code>toString</code>, defined by <code>Object</code> and
* inherited by all classes in Java. For additional information on
* string concatenation and conversion, see Gosling, Joy, and Steele,
* <i>The Java Language Specification</i>.
*
* <p> Unless otherwise noted, passing a <tt>null</tt> argument to a constructor
* or method in this class will cause a {@link NullPointerException} to be
* thrown.
*
* <p>A <code>String</code> represents a string in the UTF-16 format
* in which <em>supplementary characters</em> are represented by <em>surrogate
* pairs</em> (see the section <a href="Character.html#unicode">Unicode
* Character Representations</a> in the <code>Character</code> class for
* more information).
* Index values refer to <code>char</code> code units, so a supplementary
* character uses two positions in a <code>String</code>.
* <p>The <code>String</code> class provides methods for dealing with
* Unicode code points (i.e., characters), in addition to those for
* dealing with Unicode code units (i.e., <code>char</code> values).
*
* @author Lee Boynton
* @author Arthur van Hoff
* @author Martin Buchholz
* @author Ulf Zibis
* @see java.lang.Object#toString()
* @see java.lang.StringBuffer
* @see java.lang.StringBuilder
* @see java.nio.charset.Charset
* @since JDK1.0
*/
public final class String
/** The value is used for character storage. */
private final char value[];
/** Cache the hash code for the string */
/** use serialVersionUID from JDK 1.0.2 for interoperability */
/**
* Class String is special cased within the Serialization Stream Protocol.
*
* A String instance is written initially into an ObjectOutputStream in the
* following format:
* <pre>
* <code>TC_STRING</code> (utf String)
* </pre>
* The String is written by method <code>DataOutput.writeUTF</code>.
* A new handle is generated to refer to all future references to the
* string instance within the stream.
*/
new ObjectStreamField[0];
/**
* Initializes a newly created {@code String} object so that it represents
* an empty character sequence. Note that use of this constructor is
* unnecessary since Strings are immutable.
*/
public String() {
this.value = new char[0];
}
/**
* Initializes a newly created {@code String} object so that it represents
* the same sequence of characters as the argument; in other words, the
* newly created string is a copy of the argument string. Unless an
* explicit copy of {@code original} is needed, use of this constructor is
* unnecessary since Strings are immutable.
*
* @param original
* A {@code String}
*/
}
/**
* Allocates a new {@code String} so that it represents the sequence of
* characters currently contained in the character array argument. The
* contents of the character array are copied; subsequent modification of
* the character array does not affect the newly created string.
*
* @param value
* The initial value of the string
*/
}
/**
* Allocates a new {@code String} that contains characters from a subarray
* of the character array argument. The {@code offset} argument is the
* index of the first character of the subarray and the {@code count}
* argument specifies the length of the subarray. The contents of the
* subarray are copied; subsequent modification of the character array does
* not affect the newly created string.
*
* @param value
* Array that is the source of characters
*
* @param offset
* The initial offset
*
* @param count
* The length
*
* @throws IndexOutOfBoundsException
* If the {@code offset} and {@code count} arguments index
* characters outside the bounds of the {@code value} array
*/
if (offset < 0) {
throw new StringIndexOutOfBoundsException(offset);
}
if (count < 0) {
throw new StringIndexOutOfBoundsException(count);
}
// Note: offset or count might be near -1>>>1.
}
}
/**
* Allocates a new {@code String} that contains characters from a subarray
* of the <a href="Character.html#unicode">Unicode code point</a> array
* argument. The {@code offset} argument is the index of the first code
* point of the subarray and the {@code count} argument specifies the
* length of the subarray. The contents of the subarray are converted to
* {@code char}s; subsequent modification of the {@code int} array does not
* affect the newly created string.
*
* @param codePoints
* Array that is the source of Unicode code points
*
* @param offset
* The initial offset
*
* @param count
* The length
*
* @throws IllegalArgumentException
* If any invalid Unicode code point is found in {@code
* codePoints}
*
* @throws IndexOutOfBoundsException
* If the {@code offset} and {@code count} arguments index
* characters outside the bounds of the {@code codePoints} array
*
* @since 1.5
*/
if (offset < 0) {
throw new StringIndexOutOfBoundsException(offset);
}
if (count < 0) {
throw new StringIndexOutOfBoundsException(count);
}
// Note: offset or count might be near -1>>>1.
}
// Pass 1: Compute precise size of char[]
int n = count;
int c = codePoints[i];
if (Character.isBmpCodePoint(c))
continue;
else if (Character.isValidCodePoint(c))
n++;
}
// Pass 2: Allocate and fill in char[]
final char[] v = new char[n];
int c = codePoints[i];
if (Character.isBmpCodePoint(c))
v[j] = (char)c;
else
Character.toSurrogates(c, v, j++);
}
this.value = v;
}
/**
* Allocates a new {@code String} constructed from a subarray of an array
* of 8-bit integer values.
*
* <p> The {@code offset} argument is the index of the first byte of the
* subarray, and the {@code count} argument specifies the length of the
* subarray.
*
* <p> Each {@code byte} in the subarray is converted to a {@code char} as
* specified in the method above.
*
* @deprecated This method does not properly convert bytes into characters.
* As of JDK 1.1, the preferred way to do this is via the
* {@code String} constructors that take a {@link
* java.nio.charset.Charset}, charset name, or that use the platform's
* default charset.
*
* @param ascii
* The bytes to be converted to characters
*
* @param hibyte
* The top 8 bits of each 16-bit Unicode code unit
*
* @param offset
* The initial offset
* @param count
* The length
*
* @throws IndexOutOfBoundsException
* If the {@code offset} or {@code count} argument is invalid
*
* @see #String(byte[], int)
* @see #String(byte[], int, int, java.lang.String)
* @see #String(byte[], int, int, java.nio.charset.Charset)
* @see #String(byte[], int, int)
* @see #String(byte[], java.lang.String)
* @see #String(byte[], java.nio.charset.Charset)
* @see #String(byte[])
*/
if (hibyte == 0) {
for (int i = count; i-- > 0;) {
}
} else {
hibyte <<= 8;
for (int i = count; i-- > 0;) {
}
}
}
/**
* Allocates a new {@code String} containing characters constructed from
* an array of 8-bit integer values. Each character <i>c</i>in the
* resulting string is constructed from the corresponding component
* <i>b</i> in the byte array such that:
*
* <blockquote><pre>
* <b><i>c</i></b> == (char)(((hibyte & 0xff) << 8)
* | (<b><i>b</i></b> & 0xff))
* </pre></blockquote>
*
* @deprecated This method does not properly convert bytes into
* characters. As of JDK 1.1, the preferred way to do this is via the
* {@code String} constructors that take a {@link
* java.nio.charset.Charset}, charset name, or that use the platform's
* default charset.
*
* @param ascii
* The bytes to be converted to characters
*
* @param hibyte
* The top 8 bits of each 16-bit Unicode code unit
*
* @see #String(byte[], int, int, java.lang.String)
* @see #String(byte[], int, int, java.nio.charset.Charset)
* @see #String(byte[], int, int)
* @see #String(byte[], java.lang.String)
* @see #String(byte[], java.nio.charset.Charset)
* @see #String(byte[])
*/
}
/* Common private utility method used to bounds check the byte array
* and requested offset & length values used by the String(byte[],..)
* constructors.
*/
if (length < 0)
throw new StringIndexOutOfBoundsException(length);
if (offset < 0)
throw new StringIndexOutOfBoundsException(offset);
}
/**
* Constructs a new {@code String} by decoding the specified subarray of
* bytes using the specified charset. The length of the new {@code String}
* is a function of the charset, and hence may not be equal to the length
* of the subarray.
*
* <p> The behavior of this constructor when the given bytes are not valid
* in the given charset is unspecified. The {@link
* java.nio.charset.CharsetDecoder} class should be used when more control
* over the decoding process is required.
*
* @param bytes
* The bytes to be decoded into characters
*
* @param offset
* The index of the first byte to decode
*
* @param length
* The number of bytes to decode
* @param charsetName
* The name of a supported {@linkplain java.nio.charset.Charset
* charset}
*
* @throws UnsupportedEncodingException
* If the named charset is not supported
*
* @throws IndexOutOfBoundsException
* If the {@code offset} and {@code length} arguments index
* characters outside the bounds of the {@code bytes} array
*
* @since JDK1.1
*/
throws UnsupportedEncodingException {
if (charsetName == null)
throw new NullPointerException("charsetName");
}
/**
* Constructs a new {@code String} by decoding the specified subarray of
* bytes using the specified {@linkplain java.nio.charset.Charset charset}.
* The length of the new {@code String} is a function of the charset, and
* hence may not be equal to the length of the subarray.
*
* <p> This method always replaces malformed-input and unmappable-character
* sequences with this charset's default replacement string. The {@link
* java.nio.charset.CharsetDecoder} class should be used when more control
* over the decoding process is required.
*
* @param bytes
* The bytes to be decoded into characters
*
* @param offset
* The index of the first byte to decode
*
* @param length
* The number of bytes to decode
*
* @param charset
* The {@linkplain java.nio.charset.Charset charset} to be used to
* decode the {@code bytes}
*
* @throws IndexOutOfBoundsException
* If the {@code offset} and {@code length} arguments index
* characters outside the bounds of the {@code bytes} array
*
* @since 1.6
*/
throw new NullPointerException("charset");
}
/**
* Constructs a new {@code String} by decoding the specified array of bytes
* using the specified {@linkplain java.nio.charset.Charset charset}. The
* length of the new {@code String} is a function of the charset, and hence
* may not be equal to the length of the byte array.
*
* <p> The behavior of this constructor when the given bytes are not valid
* in the given charset is unspecified. The {@link
* java.nio.charset.CharsetDecoder} class should be used when more control
* over the decoding process is required.
*
* @param bytes
* The bytes to be decoded into characters
*
* @param charsetName
* The name of a supported {@linkplain java.nio.charset.Charset
* charset}
*
* @throws UnsupportedEncodingException
* If the named charset is not supported
*
* @since JDK1.1
*/
throws UnsupportedEncodingException {
}
/**
* Constructs a new {@code String} by decoding the specified array of
* bytes using the specified {@linkplain java.nio.charset.Charset charset}.
* The length of the new {@code String} is a function of the charset, and
* hence may not be equal to the length of the byte array.
*
* <p> This method always replaces malformed-input and unmappable-character
* sequences with this charset's default replacement string. The {@link
* java.nio.charset.CharsetDecoder} class should be used when more control
* over the decoding process is required.
*
* @param bytes
* The bytes to be decoded into characters
*
* @param charset
* The {@linkplain java.nio.charset.Charset charset} to be used to
* decode the {@code bytes}
*
* @since 1.6
*/
}
/**
* Constructs a new {@code String} by decoding the specified subarray of
* bytes using the platform's default charset. The length of the new
* {@code String} is a function of the charset, and hence may not be equal
* to the length of the subarray.
*
* <p> The behavior of this constructor when the given bytes are not valid
* in the default charset is unspecified. The {@link
* java.nio.charset.CharsetDecoder} class should be used when more control
* over the decoding process is required.
*
* @param bytes
* The bytes to be decoded into characters
*
* @param offset
* The index of the first byte to decode
*
* @param length
* The number of bytes to decode
*
* @throws IndexOutOfBoundsException
* If the {@code offset} and the {@code length} arguments index
* characters outside the bounds of the {@code bytes} array
*
* @since JDK1.1
*/
}
/**
* Constructs a new {@code String} by decoding the specified array of bytes
* using the platform's default charset. The length of the new {@code
* String} is a function of the charset, and hence may not be equal to the
* length of the byte array.
*
* <p> The behavior of this constructor when the given bytes are not valid
* in the default charset is unspecified. The {@link
* java.nio.charset.CharsetDecoder} class should be used when more control
* over the decoding process is required.
*
* @param bytes
* The bytes to be decoded into characters
*
* @since JDK1.1
*/
}
/**
* Allocates a new string that contains the sequence of characters
* currently contained in the string buffer argument. The contents of the
* string buffer are copied; subsequent modification of the string buffer
* does not affect the newly created string.
*
* @param buffer
* A {@code StringBuffer}
*/
synchronized(buffer) {
}
}
/**
* Allocates a new string that contains the sequence of characters
* currently contained in the string builder argument. The contents of the
* string builder are copied; subsequent modification of the string builder
* does not affect the newly created string.
*
* <p> This constructor is provided to ease migration to {@code
* StringBuilder}. Obtaining a string from a string builder via the {@code
* toString} method is likely to run faster and is generally preferred.
*
* @param builder
* A {@code StringBuilder}
*
* @since 1.5
*/
}
/*
* Package private constructor which shares value array for speed.
* this constructor is always expected to be called with share==true.
* a separate constructor is needed because we already have a public
* String(char[]) constructor that makes a copy of the given char[].
*/
// assert share : "unshared not supported";
}
/**
* Package private constructor
*
* @deprecated Use {@link #String(char[],int,int)} instead.
*/
}
/**
* Returns the length of this string.
* The length is equal to the number of <a href="Character.html#unicode">Unicode
* code units</a> in the string.
*
* @return the length of the sequence of characters represented by this
* object.
*/
public int length() {
}
/**
* Returns <tt>true</tt> if, and only if, {@link #length()} is <tt>0</tt>.
*
* @return <tt>true</tt> if {@link #length()} is <tt>0</tt>, otherwise
* <tt>false</tt>
*
* @since 1.6
*/
public boolean isEmpty() {
}
/**
* Returns the <code>char</code> value at the
* specified index. An index ranges from <code>0</code> to
* <code>length() - 1</code>. The first <code>char</code> value of the sequence
* is at index <code>0</code>, the next at index <code>1</code>,
* and so on, as for array indexing.
*
* <p>If the <code>char</code> value specified by the index is a
* <a href="Character.html#unicode">surrogate</a>, the surrogate
* value is returned.
*
* @param index the index of the <code>char</code> value.
* @return the <code>char</code> value at the specified index of this string.
* The first <code>char</code> value is at index <code>0</code>.
* @exception IndexOutOfBoundsException if the <code>index</code>
* argument is negative or not less than the length of this
* string.
*/
throw new StringIndexOutOfBoundsException(index);
}
}
/**
* Returns the character (Unicode code point) at the specified
* index. The index refers to <code>char</code> values
* (Unicode code units) and ranges from <code>0</code> to
* {@link #length()}<code> - 1</code>.
*
* <p> If the <code>char</code> value specified at the given index
* is in the high-surrogate range, the following index is less
* than the length of this <code>String</code>, and the
* <code>char</code> value at the following index is in the
* low-surrogate range, then the supplementary code point
* corresponding to this surrogate pair is returned. Otherwise,
* the <code>char</code> value at the given index is returned.
*
* @param index the index to the <code>char</code> values
* @return the code point value of the character at the
* <code>index</code>
* @exception IndexOutOfBoundsException if the <code>index</code>
* argument is negative or not less than the length of this
* string.
* @since 1.5
*/
throw new StringIndexOutOfBoundsException(index);
}
}
/**
* Returns the character (Unicode code point) before the specified
* index. The index refers to <code>char</code> values
* (Unicode code units) and ranges from <code>1</code> to {@link
* CharSequence#length() length}.
*
* <p> If the <code>char</code> value at <code>(index - 1)</code>
* is in the low-surrogate range, <code>(index - 2)</code> is not
* negative, and the <code>char</code> value at <code>(index -
* 2)</code> is in the high-surrogate range, then the
* supplementary code point value of the surrogate pair is
* returned. If the <code>char</code> value at <code>index -
* 1</code> is an unpaired low-surrogate or a high-surrogate, the
* surrogate value is returned.
*
* @param index the index following the code point that should be returned
* @return the Unicode code point value before the given index.
* @exception IndexOutOfBoundsException if the <code>index</code>
* argument is less than 1 or greater than the length
* of this string.
* @since 1.5
*/
int i = index - 1;
throw new StringIndexOutOfBoundsException(index);
}
}
/**
* Returns the number of Unicode code points in the specified text
* range of this <code>String</code>. The text range begins at the
* specified <code>beginIndex</code> and extends to the
* <code>char</code> at index <code>endIndex - 1</code>. Thus the
* length (in <code>char</code>s) of the text range is
* <code>endIndex-beginIndex</code>. Unpaired surrogates within
* the text range count as one code point each.
*
* @param beginIndex the index to the first <code>char</code> of
* the text range.
* @param endIndex the index after the last <code>char</code> of
* the text range.
* @return the number of Unicode code points in the specified text
* range
* @exception IndexOutOfBoundsException if the
* <code>beginIndex</code> is negative, or <code>endIndex</code>
* is larger than the length of this <code>String</code>, or
* <code>beginIndex</code> is larger than <code>endIndex</code>.
* @since 1.5
*/
throw new IndexOutOfBoundsException();
}
}
/**
* Returns the index within this <code>String</code> that is
* offset from the given <code>index</code> by
* <code>codePointOffset</code> code points. Unpaired surrogates
* within the text range given by <code>index</code> and
* <code>codePointOffset</code> count as one code point each.
*
* @param index the index to be offset
* @param codePointOffset the offset in code points
* @return the index within this <code>String</code>
* @exception IndexOutOfBoundsException if <code>index</code>
* is negative or larger then the length of this
* <code>String</code>, or if <code>codePointOffset</code> is positive
* and the substring starting with <code>index</code> has fewer
* than <code>codePointOffset</code> code points,
* or if <code>codePointOffset</code> is negative and the substring
* before <code>index</code> has fewer than the absolute value
* of <code>codePointOffset</code> code points.
* @since 1.5
*/
throw new IndexOutOfBoundsException();
}
}
/**
* Copy characters from this string into dst starting at dstBegin.
* This method doesn't perform any range checking.
*/
}
/**
* Copies characters from this string into the destination character
* array.
* <p>
* The first character to be copied is at index <code>srcBegin</code>;
* the last character to be copied is at index <code>srcEnd-1</code>
* (thus the total number of characters to be copied is
* <code>srcEnd-srcBegin</code>). The characters are copied into the
* subarray of <code>dst</code> starting at index <code>dstBegin</code>
* and ending at index:
* <p><blockquote><pre>
* dstbegin + (srcEnd-srcBegin) - 1
* </pre></blockquote>
*
* @param srcBegin index of the first character in the string
* to copy.
* @param srcEnd index after the last character in the string
* to copy.
* @param dst the destination array.
* @param dstBegin the start offset in the destination array.
* @exception IndexOutOfBoundsException If any of the following
* is true:
* <ul><li><code>srcBegin</code> is negative.
* <li><code>srcBegin</code> is greater than <code>srcEnd</code>
* <li><code>srcEnd</code> is greater than the length of this
* string
* <li><code>dstBegin</code> is negative
* <li><code>dstBegin+(srcEnd-srcBegin)</code> is larger than
* <code>dst.length</code></ul>
*/
if (srcBegin < 0) {
throw new StringIndexOutOfBoundsException(srcBegin);
}
throw new StringIndexOutOfBoundsException(srcEnd);
}
}
}
/**
* Copies characters from this string into the destination byte array. Each
* byte receives the 8 low-order bits of the corresponding character. The
* eight high-order bits of each character are not copied and do not
* participate in the transfer in any way.
*
* <p> The first character to be copied is at index {@code srcBegin}; the
* last character to be copied is at index {@code srcEnd-1}. The total
* number of characters to be copied is {@code srcEnd-srcBegin}. The
* characters, converted to bytes, are copied into the subarray of {@code
* dst} starting at index {@code dstBegin} and ending at index:
*
* <blockquote><pre>
* dstbegin + (srcEnd-srcBegin) - 1
* </pre></blockquote>
*
* @deprecated This method does not properly convert characters into
* bytes. As of JDK 1.1, the preferred way to do this is via the
* {@link #getBytes()} method, which uses the platform's default charset.
*
* @param srcBegin
* Index of the first character in the string to copy
*
* @param srcEnd
* Index after the last character in the string to copy
*
* @param dst
* The destination array
*
* @param dstBegin
* The start offset in the destination array
*
* @throws IndexOutOfBoundsException
* If any of the following is true:
* <ul>
* <li> {@code srcBegin} is negative
* <li> {@code srcBegin} is greater than {@code srcEnd}
* <li> {@code srcEnd} is greater than the length of this String
* <li> {@code dstBegin} is negative
* <li> {@code dstBegin+(srcEnd-srcBegin)} is larger than {@code
* dst.length}
* </ul>
*/
if (srcBegin < 0) {
throw new StringIndexOutOfBoundsException(srcBegin);
}
throw new StringIndexOutOfBoundsException(srcEnd);
}
}
int j = dstBegin;
int n = srcEnd;
int i = srcBegin;
while (i < n) {
}
}
/**
* Encodes this {@code String} into a sequence of bytes using the named
* charset, storing the result into a new byte array.
*
* <p> The behavior of this method when this string cannot be encoded in
* the given charset is unspecified. The {@link
* java.nio.charset.CharsetEncoder} class should be used when more control
* over the encoding process is required.
*
* @param charsetName
* The name of a supported {@linkplain java.nio.charset.Charset
* charset}
*
* @return The resultant byte array
*
* @throws UnsupportedEncodingException
* If the named charset is not supported
*
* @since JDK1.1
*/
throws UnsupportedEncodingException {
}
/**
* Encodes this {@code String} into a sequence of bytes using the given
* {@linkplain java.nio.charset.Charset charset}, storing the result into a
* new byte array.
*
* <p> This method always replaces malformed-input and unmappable-character
* sequences with this charset's default replacement byte array. The
* {@link java.nio.charset.CharsetEncoder} class should be used when more
* control over the encoding process is required.
*
* @param charset
* The {@linkplain java.nio.charset.Charset} to be used to encode
* the {@code String}
*
* @return The resultant byte array
*
* @since 1.6
*/
}
/**
* Encodes this {@code String} into a sequence of bytes using the
* platform's default charset, storing the result into a new byte array.
*
* <p> The behavior of this method when this string cannot be encoded in
* the default charset is unspecified. The {@link
* java.nio.charset.CharsetEncoder} class should be used when more control
* over the encoding process is required.
*
* @return The resultant byte array
*
* @since JDK1.1
*/
public byte[] getBytes() {
}
/**
* Compares this string to the specified object. The result is {@code
* true} if and only if the argument is not {@code null} and is a {@code
* String} object that represents the same sequence of characters as this
* object.
*
* @param anObject
* The object to compare this {@code String} against
*
* @return {@code true} if the given object represents a {@code String}
* equivalent to this string, {@code false} otherwise
*
* @see #compareTo(String)
* @see #equalsIgnoreCase(String)
*/
if (this == anObject) {
return true;
}
int i = 0;
while (n-- != 0) {
return false;
i++;
}
return true;
}
}
return false;
}
/**
* Compares this string to the specified {@code StringBuffer}. The result
* is {@code true} if and only if this {@code String} represents the same
* sequence of characters as the specified {@code StringBuffer}.
*
* @param sb
* The {@code StringBuffer} to compare this {@code String} against
*
* @return {@code true} if this {@code String} represents the same
* sequence of characters as the specified {@code StringBuffer},
* {@code false} otherwise
*
* @since 1.4
*/
synchronized (sb) {
}
}
/**
* Compares this string to the specified {@code CharSequence}. The result
* is {@code true} if and only if this {@code String} represents the same
* sequence of char values as the specified sequence.
*
* @param cs
* The sequence to compare this {@code String} against
*
* @return {@code true} if this {@code String} represents the same
* sequence of char values as the specified sequence, {@code
* false} otherwise
*
* @since 1.5
*/
return false;
// Argument is a StringBuffer, StringBuilder
if (cs instanceof AbstractStringBuilder) {
int i = 0;
while (n-- != 0) {
return false;
i++;
}
return true;
}
// Argument is a String
return true;
// Argument is a generic CharSequence
int i = 0;
while (n-- != 0) {
return false;
i++;
}
return true;
}
/**
* Compares this {@code String} to another {@code String}, ignoring case
* considerations. Two strings are considered equal ignoring case if they
* are of the same length and corresponding characters in the two strings
* are equal ignoring case.
*
* <p> Two characters {@code c1} and {@code c2} are considered the same
* ignoring case if at least one of the following is true:
* <ul>
* <li> The two characters are the same (as compared by the
* {@code ==} operator)
* <li> Applying the method {@link
* java.lang.Character#toUpperCase(char)} to each character
* produces the same result
* <li> Applying the method {@link
* java.lang.Character#toLowerCase(char)} to each character
* produces the same result
* </ul>
*
* @param anotherString
* The {@code String} to compare this {@code String} against
*
* @return {@code true} if the argument is not {@code null} and it
* represents an equivalent {@code String} ignoring case; {@code
* false} otherwise
*
* @see #equals(Object)
*/
return (this == anotherString) ? true
: (anotherString != null)
}
/**
* Compares two strings lexicographically.
* The comparison is based on the Unicode value of each character in
* the strings. The character sequence represented by this
* <code>String</code> object is compared lexicographically to the
* character sequence represented by the argument string. The result is
* a negative integer if this <code>String</code> object
* lexicographically precedes the argument string. The result is a
* positive integer if this <code>String</code> object lexicographically
* follows the argument string. The result is zero if the strings
* are equal; <code>compareTo</code> returns <code>0</code> exactly when
* the {@link #equals(Object)} method would return <code>true</code>.
* <p>
* This is the definition of lexicographic ordering. If two strings are
* different, then either they have different characters at some index
* that is a valid index for both strings, or their lengths are different,
* or both. If they have different characters at one or more index
* positions, let <i>k</i> be the smallest such index; then the string
* whose character at position <i>k</i> has the smaller value, as
* determined by using the < operator, lexicographically precedes the
* other string. In this case, <code>compareTo</code> returns the
* difference of the two character values at position <code>k</code> in
* the two string -- that is, the value:
* <blockquote><pre>
* this.charAt(k)-anotherString.charAt(k)
* </pre></blockquote>
* If there is no index position at which they differ, then the shorter
* string lexicographically precedes the longer string. In this case,
* <code>compareTo</code> returns the difference of the lengths of the
* strings -- that is, the value:
* <blockquote><pre>
* this.length()-anotherString.length()
* </pre></blockquote>
*
* @param anotherString the <code>String</code> to be compared.
* @return the value <code>0</code> if the argument string is equal to
* this string; a value less than <code>0</code> if this string
* is lexicographically less than the string argument; and a
* value greater than <code>0</code> if this string is
* lexicographically greater than the string argument.
*/
int k = 0;
while (k < lim) {
}
k++;
}
}
/**
* A Comparator that orders <code>String</code> objects as by
* <code>compareToIgnoreCase</code>. This comparator is serializable.
* <p>
* Note that this Comparator does <em>not</em> take locale into account,
* and will result in an unsatisfactory ordering for certain locales.
* The java.text package provides <em>Collators</em> to allow
* locale-sensitive ordering.
*
* @see java.text.Collator#compare(String, String)
* @since 1.2
*/
= new CaseInsensitiveComparator();
private static class CaseInsensitiveComparator
// use serialVersionUID from JDK 1.2.2 for interoperability
for (int i = 0; i < min; i++) {
// No overflow because of numeric promotion
}
}
}
}
}
}
/**
* Compares two strings lexicographically, ignoring case
* differences. This method returns an integer whose sign is that of
* calling <code>compareTo</code> with normalized versions of the strings
* where case differences have been eliminated by calling
* <code>Character.toLowerCase(Character.toUpperCase(character))</code> on
* each character.
* <p>
* Note that this method does <em>not</em> take locale into account,
* and will result in an unsatisfactory ordering for certain locales.
* The java.text package provides <em>collators</em> to allow
* locale-sensitive ordering.
*
* @param str the <code>String</code> to be compared.
* @return a negative integer, zero, or a positive integer as the
* specified String is greater than, equal to, or less
* than this String, ignoring case considerations.
* @see java.text.Collator#compare(String, String)
* @since 1.2
*/
}
/**
* Tests if two string regions are equal.
* <p>
* A substring of this <tt>String</tt> object is compared to a substring
* of the argument other. The result is true if these substrings
* represent identical character sequences. The substring of this
* <tt>String</tt> object to be compared begins at index <tt>toffset</tt>
* and has length <tt>len</tt>. The substring of other to be compared
* begins at index <tt>ooffset</tt> and has length <tt>len</tt>. The
* result is <tt>false</tt> if and only if at least one of the following
* is true:
* <ul><li><tt>toffset</tt> is negative.
* <li><tt>ooffset</tt> is negative.
* <li><tt>toffset+len</tt> is greater than the length of this
* <tt>String</tt> object.
* <li><tt>ooffset+len</tt> is greater than the length of the other
* argument.
* <li>There is some nonnegative integer <i>k</i> less than <tt>len</tt>
* such that:
* <tt>this.charAt(toffset+<i>k</i>) != other.charAt(ooffset+<i>k</i>)</tt>
* </ul>
*
* @param toffset the starting offset of the subregion in this string.
* @param other the string argument.
* @param ooffset the starting offset of the subregion in the string
* argument.
* @param len the number of characters to compare.
* @return <code>true</code> if the specified subregion of this string
* exactly matches the specified subregion of the string argument;
* <code>false</code> otherwise.
*/
int len) {
// Note: toffset, ooffset, or len might be near -1>>>1.
return false;
}
while (len-- > 0) {
return false;
}
}
return true;
}
/**
* Tests if two string regions are equal.
* <p>
* A substring of this <tt>String</tt> object is compared to a substring
* of the argument <tt>other</tt>. The result is <tt>true</tt> if these
* substrings represent character sequences that are the same, ignoring
* case if and only if <tt>ignoreCase</tt> is true. The substring of
* this <tt>String</tt> object to be compared begins at index
* <tt>toffset</tt> and has length <tt>len</tt>. The substring of
* <tt>other</tt> to be compared begins at index <tt>ooffset</tt> and
* has length <tt>len</tt>. The result is <tt>false</tt> if and only if
* at least one of the following is true:
* <ul><li><tt>toffset</tt> is negative.
* <li><tt>ooffset</tt> is negative.
* <li><tt>toffset+len</tt> is greater than the length of this
* <tt>String</tt> object.
* <li><tt>ooffset+len</tt> is greater than the length of the other
* argument.
* <li><tt>ignoreCase</tt> is <tt>false</tt> and there is some nonnegative
* integer <i>k</i> less than <tt>len</tt> such that:
* <blockquote><pre>
* this.charAt(toffset+k) != other.charAt(ooffset+k)
* </pre></blockquote>
* <li><tt>ignoreCase</tt> is <tt>true</tt> and there is some nonnegative
* integer <i>k</i> less than <tt>len</tt> such that:
* <blockquote><pre>
* Character.toLowerCase(this.charAt(toffset+k)) !=
Character.toLowerCase(other.charAt(ooffset+k))
* </pre></blockquote>
* and:
* <blockquote><pre>
* Character.toUpperCase(this.charAt(toffset+k)) !=
* Character.toUpperCase(other.charAt(ooffset+k))
* </pre></blockquote>
* </ul>
*
* @param ignoreCase if <code>true</code>, ignore case when comparing
* characters.
* @param toffset the starting offset of the subregion in this
* string.
* @param other the string argument.
* @param ooffset the starting offset of the subregion in the string
* argument.
* @param len the number of characters to compare.
* @return <code>true</code> if the specified subregion of this string
* matches the specified subregion of the string argument;
* <code>false</code> otherwise. Whether the matching is exact
* or case insensitive depends on the <code>ignoreCase</code>
* argument.
*/
// Note: toffset, ooffset, or len might be near -1>>>1.
return false;
}
while (len-- > 0) {
continue;
}
if (ignoreCase) {
// If characters don't match but case may be ignored,
// try converting both characters to uppercase.
// If the results match, then the comparison scan should
// continue.
continue;
}
// Unfortunately, conversion to uppercase does not work properly
// for the Georgian alphabet, which has strange rules about case
// conversion. So we need to make one last check before
// exiting.
continue;
}
}
return false;
}
return true;
}
/**
* Tests if the substring of this string beginning at the
* specified index starts with the specified prefix.
*
* @param prefix the prefix.
* @param toffset where to begin looking in this string.
* @return <code>true</code> if the character sequence represented by the
* argument is a prefix of the substring of this object starting
* at index <code>toffset</code>; <code>false</code> otherwise.
* The result is <code>false</code> if <code>toffset</code> is
* negative or greater than the length of this
* <code>String</code> object; otherwise the result is the same
* as the result of the expression
* <pre>
* this.substring(toffset).startsWith(prefix)
* </pre>
*/
int po = 0;
// Note: toffset might be near -1>>>1.
return false;
}
while (--pc >= 0) {
return false;
}
}
return true;
}
/**
* Tests if this string starts with the specified prefix.
*
* @param prefix the prefix.
* @return <code>true</code> if the character sequence represented by the
* argument is a prefix of the character sequence represented by
* this string; <code>false</code> otherwise.
* Note also that <code>true</code> will be returned if the
* argument is an empty string or is equal to this
* <code>String</code> object as determined by the
* {@link #equals(Object)} method.
* @since 1. 0
*/
}
/**
* Tests if this string ends with the specified suffix.
*
* @param suffix the suffix.
* @return <code>true</code> if the character sequence represented by the
* argument is a suffix of the character sequence represented by
* this object; <code>false</code> otherwise. Note that the
* result will be <code>true</code> if the argument is the
* empty string or is equal to this <code>String</code> object
* as determined by the {@link #equals(Object)} method.
*/
}
/**
* Returns a hash code for this string. The hash code for a
* <code>String</code> object is computed as
* <blockquote><pre>
* s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1]
* </pre></blockquote>
* using <code>int</code> arithmetic, where <code>s[i]</code> is the
* <i>i</i>th character of the string, <code>n</code> is the length of
* the string, and <code>^</code> indicates exponentiation.
* (The hash value of the empty string is zero.)
*
* @return a hash code value for this object.
*/
public int hashCode() {
int h = hash;
h = 31 * h + val[i];
}
hash = h;
}
return h;
}
/**
* Returns the index within this string of the first occurrence of
* the specified character. If a character with value
* <code>ch</code> occurs in the character sequence represented by
* this <code>String</code> object, then the index (in Unicode
* code units) of the first such occurrence is returned. For
* values of <code>ch</code> in the range from 0 to 0xFFFF
* (inclusive), this is the smallest value <i>k</i> such that:
* <blockquote><pre>
* this.charAt(<i>k</i>) == ch
* </pre></blockquote>
* is true. For other values of <code>ch</code>, it is the
* smallest value <i>k</i> such that:
* <blockquote><pre>
* this.codePointAt(<i>k</i>) == ch
* </pre></blockquote>
* is true. In either case, if no such character occurs in this
* string, then <code>-1</code> is returned.
*
* @param ch a character (Unicode code point).
* @return the index of the first occurrence of the character in the
* character sequence represented by this object, or
* <code>-1</code> if the character does not occur.
*/
}
/**
* Returns the index within this string of the first occurrence of the
* specified character, starting the search at the specified index.
* <p>
* If a character with value <code>ch</code> occurs in the
* character sequence represented by this <code>String</code>
* object at an index no smaller than <code>fromIndex</code>, then
* the index of the first such occurrence is returned. For values
* of <code>ch</code> in the range from 0 to 0xFFFF (inclusive),
* this is the smallest value <i>k</i> such that:
* <blockquote><pre>
* (this.charAt(<i>k</i>) == ch) && (<i>k</i> >= fromIndex)
* </pre></blockquote>
* is true. For other values of <code>ch</code>, it is the
* smallest value <i>k</i> such that:
* <blockquote><pre>
* (this.codePointAt(<i>k</i>) == ch) && (<i>k</i> >= fromIndex)
* </pre></blockquote>
* is true. In either case, if no such character occurs in this
* string at or after position <code>fromIndex</code>, then
* <code>-1</code> is returned.
*
* <p>
* There is no restriction on the value of <code>fromIndex</code>. If it
* is negative, it has the same effect as if it were zero: this entire
* string may be searched. If it is greater than the length of this
* string, it has the same effect as if it were equal to the length of
* this string: <code>-1</code> is returned.
*
* <p>All indices are specified in <code>char</code> values
* (Unicode code units).
*
* @param ch a character (Unicode code point).
* @param fromIndex the index to start the search from.
* @return the index of the first occurrence of the character in the
* character sequence represented by this object that is greater
* than or equal to <code>fromIndex</code>, or <code>-1</code>
* if the character does not occur.
*/
if (fromIndex < 0) {
fromIndex = 0;
// Note: fromIndex might be near -1>>>1.
return -1;
}
// handle most cases here (ch is a BMP code point or a
// negative value (invalid code point))
return i;
}
}
return -1;
} else {
}
}
/**
* Handles (rare) calls of indexOf with a supplementary character.
*/
return i;
}
}
}
return -1;
}
/**
* Returns the index within this string of the last occurrence of
* the specified character. For values of <code>ch</code> in the
* range from 0 to 0xFFFF (inclusive), the index (in Unicode code
* units) returned is the largest value <i>k</i> such that:
* <blockquote><pre>
* this.charAt(<i>k</i>) == ch
* </pre></blockquote>
* is true. For other values of <code>ch</code>, it is the
* largest value <i>k</i> such that:
* <blockquote><pre>
* this.codePointAt(<i>k</i>) == ch
* </pre></blockquote>
* is true. In either case, if no such character occurs in this
* string, then <code>-1</code> is returned. The
* <code>String</code> is searched backwards starting at the last
* character.
*
* @param ch a character (Unicode code point).
* @return the index of the last occurrence of the character in the
* character sequence represented by this object, or
* <code>-1</code> if the character does not occur.
*/
}
/**
* Returns the index within this string of the last occurrence of
* the specified character, searching backward starting at the
* specified index. For values of <code>ch</code> in the range
* from 0 to 0xFFFF (inclusive), the index returned is the largest
* value <i>k</i> such that:
* <blockquote><pre>
* (this.charAt(<i>k</i>) == ch) && (<i>k</i> <= fromIndex)
* </pre></blockquote>
* is true. For other values of <code>ch</code>, it is the
* largest value <i>k</i> such that:
* <blockquote><pre>
* (this.codePointAt(<i>k</i>) == ch) && (<i>k</i> <= fromIndex)
* </pre></blockquote>
* is true. In either case, if no such character occurs in this
* string at or before position <code>fromIndex</code>, then
* <code>-1</code> is returned.
*
* <p>All indices are specified in <code>char</code> values
* (Unicode code units).
*
* @param ch a character (Unicode code point).
* @param fromIndex the index to start the search from. There is no
* restriction on the value of <code>fromIndex</code>. If it is
* greater than or equal to the length of this string, it has
* the same effect as if it were equal to one less than the
* length of this string: this entire string may be searched.
* If it is negative, it has the same effect as if it were -1:
* -1 is returned.
* @return the index of the last occurrence of the character in the
* character sequence represented by this object that is less
* than or equal to <code>fromIndex</code>, or <code>-1</code>
* if the character does not occur before that point.
*/
// handle most cases here (ch is a BMP code point or a
// negative value (invalid code point))
for (; i >= 0; i--) {
return i;
}
}
return -1;
} else {
}
}
/**
* Handles (rare) calls of lastIndexOf with a supplementary character.
*/
for (; i >= 0; i--) {
return i;
}
}
}
return -1;
}
/**
* Returns the index within this string of the first occurrence of the
* specified substring.
*
* <p>The returned index is the smallest value <i>k</i> for which:
* <blockquote><pre>
* this.startsWith(str, <i>k</i>)
* </pre></blockquote>
* If no such value of <i>k</i> exists, then {@code -1} is returned.
*
* @param str the substring to search for.
* @return the index of the first occurrence of the specified substring,
* or {@code -1} if there is no such occurrence.
*/
}
/**
* Returns the index within this string of the first occurrence of the
* specified substring, starting at the specified index.
*
* <p>The returned index is the smallest value <i>k</i> for which:
* <blockquote><pre>
* <i>k</i> >= fromIndex && this.startsWith(str, <i>k</i>)
* </pre></blockquote>
* If no such value of <i>k</i> exists, then {@code -1} is returned.
*
* @param str the substring to search for.
* @param fromIndex the index from which to start the search.
* @return the index of the first occurrence of the specified substring,
* starting at the specified index,
* or {@code -1} if there is no such occurrence.
*/
}
/**
* Code shared by String and StringBuffer to do searches. The
* source is the character array being searched, and the target
* is the string being searched for.
*
* @param source the characters being searched.
* @param sourceOffset offset of the source string.
* @param sourceCount count of the source string.
* @param target the characters being searched for.
* @param targetOffset offset of the target string.
* @param targetCount count of the target string.
* @param fromIndex the index to begin searching from.
*/
int fromIndex) {
if (fromIndex >= sourceCount) {
}
if (fromIndex < 0) {
fromIndex = 0;
}
if (targetCount == 0) {
return fromIndex;
}
/* Look for first character. */
}
/* Found first character, now look at the rest of v2 */
if (i <= max) {
int j = i + 1;
== target[k]; j++, k++);
if (j == end) {
/* Found whole string. */
return i - sourceOffset;
}
}
}
return -1;
}
/**
* Returns the index within this string of the last occurrence of the
* specified substring. The last occurrence of the empty string ""
* is considered to occur at the index value {@code this.length()}.
*
* <p>The returned index is the largest value <i>k</i> for which:
* <blockquote><pre>
* this.startsWith(str, <i>k</i>)
* </pre></blockquote>
* If no such value of <i>k</i> exists, then {@code -1} is returned.
*
* @param str the substring to search for.
* @return the index of the last occurrence of the specified substring,
* or {@code -1} if there is no such occurrence.
*/
}
/**
* Returns the index within this string of the last occurrence of the
* specified substring, searching backward starting at the specified index.
*
* <p>The returned index is the largest value <i>k</i> for which:
* <blockquote><pre>
* <i>k</i> <= fromIndex && this.startsWith(str, <i>k</i>)
* </pre></blockquote>
* If no such value of <i>k</i> exists, then {@code -1} is returned.
*
* @param str the substring to search for.
* @param fromIndex the index to start the search from.
* @return the index of the last occurrence of the specified substring,
* searching backward from the specified index,
* or {@code -1} if there is no such occurrence.
*/
}
/**
* Code shared by String and StringBuffer to do searches. The
* source is the character array being searched, and the target
* is the string being searched for.
*
* @param source the characters being searched.
* @param sourceOffset offset of the source string.
* @param sourceCount count of the source string.
* @param target the characters being searched for.
* @param targetOffset offset of the target string.
* @param targetCount count of the target string.
* @param fromIndex the index to begin searching from.
*/
int fromIndex) {
/*
* Check arguments; return immediately where possible. For
* consistency, don't check for null str.
*/
if (fromIndex < 0) {
return -1;
}
if (fromIndex > rightIndex) {
}
/* Empty string always matches. */
if (targetCount == 0) {
return fromIndex;
}
while (true) {
i--;
}
if (i < min) {
return -1;
}
int j = i - 1;
int k = strLastIndex - 1;
while (j > start) {
i--;
continue startSearchForLastChar;
}
}
}
}
/**
* Returns a new string that is a substring of this string. The
* substring begins with the character at the specified index and
* extends to the end of this string. <p>
* Examples:
* <blockquote><pre>
* "unhappy".substring(2) returns "happy"
* "Harbison".substring(3) returns "bison"
* "emptiness".substring(9) returns "" (an empty string)
* </pre></blockquote>
*
* @param beginIndex the beginning index, inclusive.
* @return the specified substring.
* @exception IndexOutOfBoundsException if
* <code>beginIndex</code> is negative or larger than the
* length of this <code>String</code> object.
*/
if (beginIndex < 0) {
throw new StringIndexOutOfBoundsException(beginIndex);
}
if (subLen < 0) {
throw new StringIndexOutOfBoundsException(subLen);
}
}
/**
* Returns a new string that is a substring of this string. The
* substring begins at the specified <code>beginIndex</code> and
* extends to the character at index <code>endIndex - 1</code>.
* Thus the length of the substring is <code>endIndex-beginIndex</code>.
* <p>
* Examples:
* <blockquote><pre>
* "hamburger".substring(4, 8) returns "urge"
* "smiles".substring(1, 5) returns "mile"
* </pre></blockquote>
*
* @param beginIndex the beginning index, inclusive.
* @param endIndex the ending index, exclusive.
* @return the specified substring.
* @exception IndexOutOfBoundsException if the
* <code>beginIndex</code> is negative, or
* <code>endIndex</code> is larger than the length of
* this <code>String</code> object, or
* <code>beginIndex</code> is larger than
* <code>endIndex</code>.
*/
if (beginIndex < 0) {
throw new StringIndexOutOfBoundsException(beginIndex);
}
throw new StringIndexOutOfBoundsException(endIndex);
}
if (subLen < 0) {
throw new StringIndexOutOfBoundsException(subLen);
}
}
/**
* Returns a new character sequence that is a subsequence of this sequence.
*
* <p> An invocation of this method of the form
*
* <blockquote><pre>
* str.subSequence(begin, end)</pre></blockquote>
*
* behaves in exactly the same way as the invocation
*
* <blockquote><pre>
* str.substring(begin, end)</pre></blockquote>
*
* This method is defined so that the <tt>String</tt> class can implement
* the {@link CharSequence} interface. </p>
*
* @param beginIndex the begin index, inclusive.
* @param endIndex the end index, exclusive.
* @return the specified subsequence.
*
* @throws IndexOutOfBoundsException
* if <tt>beginIndex</tt> or <tt>endIndex</tt> are negative,
* if <tt>endIndex</tt> is greater than <tt>length()</tt>,
* or if <tt>beginIndex</tt> is greater than <tt>startIndex</tt>
*
* @since 1.4
* @spec JSR-51
*/
}
/**
* Concatenates the specified string to the end of this string.
* <p>
* If the length of the argument string is <code>0</code>, then this
* <code>String</code> object is returned. Otherwise, a new
* <code>String</code> object is created, representing a character
* sequence that is the concatenation of the character sequence
* represented by this <code>String</code> object and the character
* sequence represented by the argument string.<p>
* Examples:
* <blockquote><pre>
* "cares".concat("s") returns "caress"
* "to".concat("get").concat("her") returns "together"
* </pre></blockquote>
*
* @param str the <code>String</code> that is concatenated to the end
* of this <code>String</code>.
* @return a string that represents the concatenation of this object's
* characters followed by the string argument's characters.
*/
if (otherLen == 0) {
return this;
}
}
/**
* Returns a new string resulting from replacing all occurrences of
* <code>oldChar</code> in this string with <code>newChar</code>.
* <p>
* If the character <code>oldChar</code> does not occur in the
* character sequence represented by this <code>String</code> object,
* then a reference to this <code>String</code> object is returned.
* Otherwise, a new <code>String</code> object is created that
* represents a character sequence identical to the character sequence
* represented by this <code>String</code> object, except that every
* occurrence of <code>oldChar</code> is replaced by an occurrence
* of <code>newChar</code>.
* <p>
* Examples:
* <blockquote><pre>
* "mesquite in your cellar".replace('e', 'o')
* returns "mosquito in your collar"
* "the war of baronets".replace('r', 'y')
* returns "the way of bayonets"
* "sparring with a purple porpoise".replace('p', 't')
* returns "starring with a turtle tortoise"
* "JonL".replace('q', 'x') returns "JonL" (no change)
* </pre></blockquote>
*
* @param oldChar the old character.
* @param newChar the new character.
* @return a string derived from this string by replacing every
* occurrence of <code>oldChar</code> with <code>newChar</code>.
*/
int i = -1;
while (++i < len) {
break;
}
}
if (i < len) {
for (int j = 0; j < i; j++) {
}
while (i < len) {
char c = val[i];
i++;
}
}
}
return this;
}
/**
* Tells whether or not this string matches the given <a
* href="../util/regex/Pattern.html#sum">regular expression</a>.
*
* <p> An invocation of this method of the form
* <i>str</i><tt>.matches(</tt><i>regex</i><tt>)</tt> yields exactly the
* same result as the expression
*
* <blockquote><tt> {@link java.util.regex.Pattern}.{@link
* java.util.regex.Pattern#matches(String,CharSequence)
* matches}(</tt><i>regex</i><tt>,</tt> <i>str</i><tt>)</tt></blockquote>
*
* @param regex
* the regular expression to which this string is to be matched
*
* @return <tt>true</tt> if, and only if, this string matches the
* given regular expression
*
* @throws PatternSyntaxException
* if the regular expression's syntax is invalid
*
* @see java.util.regex.Pattern
*
* @since 1.4
* @spec JSR-51
*/
}
/**
* Returns true if and only if this string contains the specified
* sequence of char values.
*
* @param s the sequence to search for
* @return true if this string contains <code>s</code>, false otherwise
* @throws NullPointerException if <code>s</code> is <code>null</code>
* @since 1.5
*/
}
/**
* Replaces the first substring of this string that matches the given <a
* href="../util/regex/Pattern.html#sum">regular expression</a> with the
* given replacement.
*
* <p> An invocation of this method of the form
* <i>str</i><tt>.replaceFirst(</tt><i>regex</i><tt>,</tt> <i>repl</i><tt>)</tt>
* yields exactly the same result as the expression
*
* <blockquote><tt>
* {@link java.util.regex.Pattern}.{@link java.util.regex.Pattern#compile
* compile}(</tt><i>regex</i><tt>).{@link
* java.util.regex.Pattern#matcher(java.lang.CharSequence)
* matcher}(</tt><i>str</i><tt>).{@link java.util.regex.Matcher#replaceFirst
* replaceFirst}(</tt><i>repl</i><tt>)</tt></blockquote>
*
*<p>
* Note that backslashes (<tt>\</tt>) and dollar signs (<tt>$</tt>) in the
* replacement string may cause the results to be different than if it were
* being treated as a literal replacement string; see
* {@link java.util.regex.Matcher#replaceFirst}.
* Use {@link java.util.regex.Matcher#quoteReplacement} to suppress the special
* meaning of these characters, if desired.
*
* @param regex
* the regular expression to which this string is to be matched
* @param replacement
* the string to be substituted for the first match
*
* @return The resulting <tt>String</tt>
*
* @throws PatternSyntaxException
* if the regular expression's syntax is invalid
*
* @see java.util.regex.Pattern
*
* @since 1.4
* @spec JSR-51
*/
}
/**
* Replaces each substring of this string that matches the given <a
* href="../util/regex/Pattern.html#sum">regular expression</a> with the
* given replacement.
*
* <p> An invocation of this method of the form
* <i>str</i><tt>.replaceAll(</tt><i>regex</i><tt>,</tt> <i>repl</i><tt>)</tt>
* yields exactly the same result as the expression
*
* <blockquote><tt>
* {@link java.util.regex.Pattern}.{@link java.util.regex.Pattern#compile
* compile}(</tt><i>regex</i><tt>).{@link
* java.util.regex.Pattern#matcher(java.lang.CharSequence)
* matcher}(</tt><i>str</i><tt>).{@link java.util.regex.Matcher#replaceAll
* replaceAll}(</tt><i>repl</i><tt>)</tt></blockquote>
*
*<p>
* Note that backslashes (<tt>\</tt>) and dollar signs (<tt>$</tt>) in the
* replacement string may cause the results to be different than if it were
* being treated as a literal replacement string; see
* {@link java.util.regex.Matcher#replaceAll Matcher.replaceAll}.
* Use {@link java.util.regex.Matcher#quoteReplacement} to suppress the special
* meaning of these characters, if desired.
*
* @param regex
* the regular expression to which this string is to be matched
* @param replacement
* the string to be substituted for each match
*
* @return The resulting <tt>String</tt>
*
* @throws PatternSyntaxException
* if the regular expression's syntax is invalid
*
* @see java.util.regex.Pattern
*
* @since 1.4
* @spec JSR-51
*/
}
/**
* Replaces each substring of this string that matches the literal target
* sequence with the specified literal replacement sequence. The
* replacement proceeds from the beginning of the string to the end, for
* example, replacing "aa" with "b" in the string "aaa" will result in
* "ba" rather than "ab".
*
* @param target The sequence of char values to be replaced
* @param replacement The replacement sequence of char values
* @return The resulting string
* @throws NullPointerException if <code>target</code> or
* <code>replacement</code> is <code>null</code>.
* @since 1.5
*/
}
/**
* Splits this string around matches of the given
* <a href="../util/regex/Pattern.html#sum">regular expression</a>.
*
* <p> The array returned by this method contains each substring of this
* string that is terminated by another substring that matches the given
* expression or is terminated by the end of the string. The substrings in
* the array are in the order in which they occur in this string. If the
* expression does not match any part of the input then the resulting array
* has just one element, namely this string.
*
* <p> The <tt>limit</tt> parameter controls the number of times the
* pattern is applied and therefore affects the length of the resulting
* array. If the limit <i>n</i> is greater than zero then the pattern
* will be applied at most <i>n</i> - 1 times, the array's
* length will be no greater than <i>n</i>, and the array's last entry
* will contain all input beyond the last matched delimiter. If <i>n</i>
* is non-positive then the pattern will be applied as many times as
* possible and the array can have any length. If <i>n</i> is zero then
* the pattern will be applied as many times as possible, the array can
* have any length, and trailing empty strings will be discarded.
*
* <p> The string <tt>"boo:and:foo"</tt>, for example, yields the
* following results with these parameters:
*
* <blockquote><table cellpadding=1 cellspacing=0 summary="Split example showing regex, limit, and result">
* <tr>
* <th>Regex</th>
* <th>Limit</th>
* <th>Result</th>
* </tr>
* <tr><td align=center>:</td>
* <td align=center>2</td>
* <td><tt>{ "boo", "and:foo" }</tt></td></tr>
* <tr><td align=center>:</td>
* <td align=center>5</td>
* <td><tt>{ "boo", "and", "foo" }</tt></td></tr>
* <tr><td align=center>:</td>
* <td align=center>-2</td>
* <td><tt>{ "boo", "and", "foo" }</tt></td></tr>
* <tr><td align=center>o</td>
* <td align=center>5</td>
* <td><tt>{ "b", "", ":and:f", "", "" }</tt></td></tr>
* <tr><td align=center>o</td>
* <td align=center>-2</td>
* <td><tt>{ "b", "", ":and:f", "", "" }</tt></td></tr>
* <tr><td align=center>o</td>
* <td align=center>0</td>
* <td><tt>{ "b", "", ":and:f" }</tt></td></tr>
* </table></blockquote>
*
* <p> An invocation of this method of the form
* <i>str.</i><tt>split(</tt><i>regex</i><tt>,</tt> <i>n</i><tt>)</tt>
* yields the same result as the expression
*
* <blockquote>
* {@link java.util.regex.Pattern}.{@link java.util.regex.Pattern#compile
* compile}<tt>(</tt><i>regex</i><tt>)</tt>.{@link
* java.util.regex.Pattern#split(java.lang.CharSequence,int)
* split}<tt>(</tt><i>str</i><tt>,</tt> <i>n</i><tt>)</tt>
* </blockquote>
*
*
* @param regex
* the delimiting regular expression
*
* @param limit
* the result threshold, as described above
*
* @return the array of strings computed by splitting this string
* around matches of the given regular expression
*
* @throws PatternSyntaxException
* if the regular expression's syntax is invalid
*
* @see java.util.regex.Pattern
*
* @since 1.4
* @spec JSR-51
*/
/* fastpath if the regex is a
(1)one-char String and this character is not one of the
RegEx's meta characters ".$|()[{^?*+\\", or
(2)two-char String and the first char is the backslash and
the second is not the ascii digit or ascii letter.
*/
char ch = 0;
{
int off = 0;
int next = 0;
} else { // last one
//assert (list.size() == limit - 1);
break;
}
}
// If no match was found, return this
if (off == 0)
return new String[]{this};
// Add remaining segment
// Construct result
if (limit == 0)
resultSize--;
}
}
/**
* Splits this string around matches of the given <a
* href="../util/regex/Pattern.html#sum">regular expression</a>.
*
* <p> This method works as if by invoking the two-argument {@link
* #split(String, int) split} method with the given expression and a limit
* argument of zero. Trailing empty strings are therefore not included in
* the resulting array.
*
* <p> The string <tt>"boo:and:foo"</tt>, for example, yields the following
* results with these expressions:
*
* <blockquote><table cellpadding=1 cellspacing=0 summary="Split examples showing regex and result">
* <tr>
* <th>Regex</th>
* <th>Result</th>
* </tr>
* <tr><td align=center>:</td>
* <td><tt>{ "boo", "and", "foo" }</tt></td></tr>
* <tr><td align=center>o</td>
* <td><tt>{ "b", "", ":and:f" }</tt></td></tr>
* </table></blockquote>
*
*
* @param regex
* the delimiting regular expression
*
* @return the array of strings computed by splitting this string
* around matches of the given regular expression
*
* @throws PatternSyntaxException
* if the regular expression's syntax is invalid
*
* @see java.util.regex.Pattern
*
* @since 1.4
* @spec JSR-51
*/
}
/**
* Converts all of the characters in this <code>String</code> to lower
* case using the rules of the given <code>Locale</code>. Case mapping is based
* on the Unicode Standard version specified by the {@link java.lang.Character Character}
* class. Since case mappings are not always 1:1 char mappings, the resulting
* <code>String</code> may be a different length than the original <code>String</code>.
* <p>
* Examples of lowercase mappings are in the following table:
* <table border="1" summary="Lowercase mapping examples showing language code of locale, upper case, lower case, and description">
* <tr>
* <th>Language Code of Locale</th>
* <th>Upper Case</th>
* <th>Lower Case</th>
* <th>Description</th>
* </tr>
* <tr>
* <td>tr (Turkish)</td>
* <td>\u0130</td>
* <td>\u0069</td>
* <td>capital letter I with dot above -> small letter i</td>
* </tr>
* <tr>
* <td>tr (Turkish)</td>
* <td>\u0049</td>
* <td>\u0131</td>
* <td>capital letter I -> small letter dotless i </td>
* </tr>
* <tr>
* <td>(all)</td>
* <td>French Fries</td>
* <td>french fries</td>
* <td>lowercased all chars in String</td>
* </tr>
* <tr>
* <td>(all)</td>
* <td><img src="doc-files/capiota.gif" alt="capiota"><img src="doc-files/capchi.gif" alt="capchi">
* <img src="doc-files/captheta.gif" alt="captheta"><img src="doc-files/capupsil.gif" alt="capupsil">
* <img src="doc-files/capsigma.gif" alt="capsigma"></td>
* <img src="doc-files/theta.gif" alt="theta"><img src="doc-files/upsilon.gif" alt="upsilon">
* <img src="doc-files/sigma1.gif" alt="sigma"></td>
* <td>lowercased all chars in String</td>
* </tr>
* </table>
*
* @param locale use the case transformation rules for this locale
* @return the <code>String</code>, converted to lowercase.
* @see java.lang.String#toLowerCase()
* @see java.lang.String#toUpperCase()
* @see java.lang.String#toUpperCase(Locale)
* @since 1.1
*/
throw new NullPointerException();
}
int firstUpper;
/* Now check if there are any characters that need to be changed. */
scan: {
char c = value[firstUpper];
if ((c >= Character.MIN_HIGH_SURROGATE)
&& (c <= Character.MAX_HIGH_SURROGATE)) {
break scan;
}
} else {
if (c != Character.toLowerCase(c)) {
break scan;
}
firstUpper++;
}
}
return this;
}
* is the write location in result */
/* Just copy the first few lowerCase characters. */
boolean localeDependent =
char[] lowerCharArray;
int lowerChar;
int srcChar;
int srcCount;
srcChar = codePointAt(i);
} else {
srcCount = 1;
}
} else {
}
} else {
}
} else if (srcCount == 2) {
continue;
} else {
}
/* Grow result if needed */
}
for (int x = 0; x < mapLen; ++x) {
}
} else {
}
}
}
/**
* Converts all of the characters in this <code>String</code> to lower
* case using the rules of the default locale. This is equivalent to calling
* <code>toLowerCase(Locale.getDefault())</code>.
* <p>
* <b>Note:</b> This method is locale sensitive, and may produce unexpected
* results if used for strings that are intended to be interpreted locale
* independently.
* Examples are programming language identifiers, protocol keys, and HTML
* tags.
* For instance, <code>"TITLE".toLowerCase()</code> in a Turkish locale
* returns <code>"t\u005Cu0131tle"</code>, where '\u005Cu0131' is the
* LATIN SMALL LETTER DOTLESS I character.
* To obtain correct results for locale insensitive strings, use
* <code>toLowerCase(Locale.ENGLISH)</code>.
* <p>
* @return the <code>String</code>, converted to lowercase.
* @see java.lang.String#toLowerCase(Locale)
*/
}
/**
* Converts all of the characters in this <code>String</code> to upper
* case using the rules of the given <code>Locale</code>. Case mapping is based
* on the Unicode Standard version specified by the {@link java.lang.Character Character}
* class. Since case mappings are not always 1:1 char mappings, the resulting
* <code>String</code> may be a different length than the original <code>String</code>.
* <p>
* Examples of locale-sensitive and 1:M case mappings are in the following table.
* <p>
* <table border="1" summary="Examples of locale-sensitive and 1:M case mappings. Shows Language code of locale, lower case, upper case, and description.">
* <tr>
* <th>Language Code of Locale</th>
* <th>Lower Case</th>
* <th>Upper Case</th>
* <th>Description</th>
* </tr>
* <tr>
* <td>tr (Turkish)</td>
* <td>\u0069</td>
* <td>\u0130</td>
* <td>small letter i -> capital letter I with dot above</td>
* </tr>
* <tr>
* <td>tr (Turkish)</td>
* <td>\u0131</td>
* <td>\u0049</td>
* <td>small letter dotless i -> capital letter I</td>
* </tr>
* <tr>
* <td>(all)</td>
* <td>\u00df</td>
* <td>\u0053 \u0053</td>
* <td>small letter sharp s -> two letters: SS</td>
* </tr>
* <tr>
* <td>(all)</td>
* <td>Fahrvergnügen</td>
* <td>FAHRVERGNÜGEN</td>
* <td></td>
* </tr>
* </table>
* @param locale use the case transformation rules for this locale
* @return the <code>String</code>, converted to uppercase.
* @see java.lang.String#toUpperCase()
* @see java.lang.String#toLowerCase()
* @see java.lang.String#toLowerCase(Locale)
* @since 1.1
*/
throw new NullPointerException();
}
int firstLower;
/* Now check if there are any characters that need to be changed. */
scan: {
int c = (int)value[firstLower];
int srcCount;
if ((c >= Character.MIN_HIGH_SURROGATE)
&& (c <= Character.MAX_HIGH_SURROGATE)) {
c = codePointAt(firstLower);
} else {
srcCount = 1;
}
|| (c != upperCaseChar)) {
break scan;
}
firstLower += srcCount;
}
return this;
}
* is the write location in result */
/* Just copy the first few upperCase characters. */
boolean localeDependent =
char[] upperCharArray;
int upperChar;
int srcChar;
int srcCount;
srcChar = codePointAt(i);
} else {
srcCount = 1;
}
if (localeDependent) {
} else {
}
if (localeDependent) {
} else {
}
} else if (srcCount == 2) {
continue;
} else {
}
/* Grow result if needed */
}
for (int x = 0; x < mapLen; ++x) {
}
} else {
}
}
}
/**
* Converts all of the characters in this <code>String</code> to upper
* case using the rules of the default locale. This method is equivalent to
* <code>toUpperCase(Locale.getDefault())</code>.
* <p>
* <b>Note:</b> This method is locale sensitive, and may produce unexpected
* results if used for strings that are intended to be interpreted locale
* independently.
* Examples are programming language identifiers, protocol keys, and HTML
* tags.
* For instance, <code>"title".toUpperCase()</code> in a Turkish locale
* returns <code>"T\u005Cu0130TLE"</code>, where '\u005Cu0130' is the
* LATIN CAPITAL LETTER I WITH DOT ABOVE character.
* To obtain correct results for locale insensitive strings, use
* <code>toUpperCase(Locale.ENGLISH)</code>.
* <p>
* @return the <code>String</code>, converted to uppercase.
* @see java.lang.String#toUpperCase(Locale)
*/
}
/**
* Returns a copy of the string, with leading and trailing whitespace
* omitted.
* <p>
* If this <code>String</code> object represents an empty character
* sequence, or the first and last characters of character sequence
* represented by this <code>String</code> object both have codes
* greater than <code>'\u0020'</code> (the space character), then a
* reference to this <code>String</code> object is returned.
* <p>
* Otherwise, if there is no character with a code greater than
* <code>'\u0020'</code> in the string, then a new
* <code>String</code> object representing an empty string is created
* and returned.
* <p>
* Otherwise, let <i>k</i> be the index of the first character in the
* string whose code is greater than <code>'\u0020'</code>, and let
* <i>m</i> be the index of the last character in the string whose code
* is greater than <code>'\u0020'</code>. A new <code>String</code>
* object is created, representing the substring of this string that
* begins with the character at index <i>k</i> and ends with the
* character at index <i>m</i>-that is, the result of
* <code>this.substring(<i>k</i>, <i>m</i>+1)</code>.
* <p>
* This method may be used to trim whitespace (as defined above) from
* the beginning and end of a string.
*
* @return A copy of this string with leading and trailing white
* space removed, or this string if it has no leading or
* trailing white space.
*/
int st = 0;
st++;
}
len--;
}
}
/**
* This object (which is already a string!) is itself returned.
*
* @return the string itself.
*/
return this;
}
/**
* Converts this string to a new character array.
*
* @return a newly allocated character array whose length is the length
* of this string and whose contents are initialized to contain
* the character sequence represented by this string.
*/
public char[] toCharArray() {
// Cannot use Arrays.copyOf because of class initialization order issues
return result;
}
/**
* Returns a formatted string using the specified format string and
* arguments.
*
* <p> The locale always used is the one returned by {@link
* java.util.Locale#getDefault() Locale.getDefault()}.
*
* @param format
* A <a href="../util/Formatter.html#syntax">format string</a>
*
* @param args
* Arguments referenced by the format specifiers in the format
* string. If there are more arguments than format specifiers, the
* extra arguments are ignored. The number of arguments is
* variable and may be zero. The maximum number of arguments is
* limited by the maximum dimension of a Java array as defined by
* <cite>The Java™ Virtual Machine Specification</cite>.
* The behaviour on a
* <tt>null</tt> argument depends on the <a
* href="../util/Formatter.html#syntax">conversion</a>.
*
* @throws IllegalFormatException
* If a format string contains an illegal syntax, a format
* specifier that is incompatible with the given arguments,
* insufficient arguments given the format string, or other
* illegal conditions. For specification of all possible
* formatting errors, see the <a
* href="../util/Formatter.html#detail">Details</a> section of the
* formatter class specification.
*
* @throws NullPointerException
* If the <tt>format</tt> is <tt>null</tt>
*
* @return A formatted string
*
* @see java.util.Formatter
* @since 1.5
*/
}
/**
* Returns a formatted string using the specified locale, format string,
* and arguments.
*
* @param l
* The {@linkplain java.util.Locale locale} to apply during
* formatting. If <tt>l</tt> is <tt>null</tt> then no localization
* is applied.
*
* @param format
* A <a href="../util/Formatter.html#syntax">format string</a>
*
* @param args
* Arguments referenced by the format specifiers in the format
* string. If there are more arguments than format specifiers, the
* extra arguments are ignored. The number of arguments is
* variable and may be zero. The maximum number of arguments is
* limited by the maximum dimension of a Java array as defined by
* <cite>The Java™ Virtual Machine Specification</cite>.
* The behaviour on a
* <tt>null</tt> argument depends on the <a
* href="../util/Formatter.html#syntax">conversion</a>.
*
* @throws IllegalFormatException
* If a format string contains an illegal syntax, a format
* specifier that is incompatible with the given arguments,
* insufficient arguments given the format string, or other
* illegal conditions. For specification of all possible
* formatting errors, see the <a
* href="../util/Formatter.html#detail">Details</a> section of the
* formatter class specification
*
* @throws NullPointerException
* If the <tt>format</tt> is <tt>null</tt>
*
* @return A formatted string
*
* @see java.util.Formatter
* @since 1.5
*/
}
/**
* Returns the string representation of the <code>Object</code> argument.
*
* @param obj an <code>Object</code>.
* @return if the argument is <code>null</code>, then a string equal to
* <code>"null"</code>; otherwise, the value of
* <code>obj.toString()</code> is returned.
* @see java.lang.Object#toString()
*/
}
/**
* Returns the string representation of the <code>char</code> array
* argument. The contents of the character array are copied; subsequent
* modification of the character array does not affect the newly
* created string.
*
* @param data a <code>char</code> array.
* @return a newly allocated string representing the same sequence of
* characters contained in the character array argument.
*/
}
/**
* Returns the string representation of a specific subarray of the
* <code>char</code> array argument.
* <p>
* The <code>offset</code> argument is the index of the first
* character of the subarray. The <code>count</code> argument
* specifies the length of the subarray. The contents of the subarray
* are copied; subsequent modification of the character array does not
* affect the newly created string.
*
* @param data the character array.
* @param offset the initial offset into the value of the
* <code>String</code>.
* @param count the length of the value of the <code>String</code>.
* @return a string representing the sequence of characters contained
* in the subarray of the character array argument.
* @exception IndexOutOfBoundsException if <code>offset</code> is
* negative, or <code>count</code> is negative, or
* <code>offset+count</code> is larger than
* <code>data.length</code>.
*/
}
/**
* Returns a String that represents the character sequence in the
* array specified.
*
* @param data the character array.
* @param offset initial offset of the subarray.
* @param count length of the subarray.
* @return a <code>String</code> that contains the characters of the
* specified subarray of the character array.
*/
// All public String constructors now copy the data.
}
/**
* Returns a String that represents the character sequence in the
* array specified.
*
* @param data the character array.
* @return a <code>String</code> that contains the characters of the
* character array.
*/
}
/**
* Returns the string representation of the <code>boolean</code> argument.
*
* @param b a <code>boolean</code>.
* @return if the argument is <code>true</code>, a string equal to
* <code>"true"</code> is returned; otherwise, a string equal to
* <code>"false"</code> is returned.
*/
return b ? "true" : "false";
}
/**
* Returns the string representation of the <code>char</code>
* argument.
*
* @param c a <code>char</code>.
* @return a string of length <code>1</code> containing
* as its single character the argument <code>c</code>.
*/
char data[] = {c};
}
/**
* Returns the string representation of the <code>int</code> argument.
* <p>
* The representation is exactly the one returned by the
* <code>Integer.toString</code> method of one argument.
*
* @param i an <code>int</code>.
* @return a string representation of the <code>int</code> argument.
* @see java.lang.Integer#toString(int, int)
*/
}
/**
* Returns the string representation of the <code>long</code> argument.
* <p>
* The representation is exactly the one returned by the
* <code>Long.toString</code> method of one argument.
*
* @param l a <code>long</code>.
* @return a string representation of the <code>long</code> argument.
* @see java.lang.Long#toString(long)
*/
}
/**
* Returns the string representation of the <code>float</code> argument.
* <p>
* The representation is exactly the one returned by the
* <code>Float.toString</code> method of one argument.
*
* @param f a <code>float</code>.
* @return a string representation of the <code>float</code> argument.
* @see java.lang.Float#toString(float)
*/
}
/**
* Returns the string representation of the <code>double</code> argument.
* <p>
* The representation is exactly the one returned by the
* <code>Double.toString</code> method of one argument.
*
* @param d a <code>double</code>.
* @return a string representation of the <code>double</code> argument.
* @see java.lang.Double#toString(double)
*/
}
/**
* Returns a canonical representation for the string object.
* <p>
* A pool of strings, initially empty, is maintained privately by the
* class <code>String</code>.
* <p>
* When the intern method is invoked, if the pool already contains a
* string equal to this <code>String</code> object as determined by
* the {@link #equals(Object)} method, then the string from the pool is
* returned. Otherwise, this <code>String</code> object is added to the
* pool and a reference to this <code>String</code> object is returned.
* <p>
* It follows that for any two strings <code>s</code> and <code>t</code>,
* <code>s.intern() == t.intern()</code> is <code>true</code>
* if and only if <code>s.equals(t)</code> is <code>true</code>.
* <p>
* All literal strings and string-valued constant expressions are
* interned. String literals are defined in section 3.10.5 of the
* <cite>The Java™ Language Specification</cite>.
*
* @return a string that has the same contents as this string, but is
* guaranteed to be from a pool of unique strings.
*/
/**
* Seed value used for each alternative hash calculated.
*/
private static final int HASHING_SEED;
static {
int SEED_MATERIAL[] = {
(int) (nanos >>> 32),
(int) nanos,
(int) (now >>> 32),
(int) now,
};
// Use murmur3 to scramble the seeding material.
// Inline implementation to avoid loading classes
int h1 = 0;
// body
for (int k1 : SEED_MATERIAL) {
k1 *= 0xcc9e2d51;
k1 *= 0x1b873593;
}
// tail (always empty, as body is always 32-bit chunks)
// finalization
// finalization mix force all bits of a hash block to avalanche
h1 *= 0x85ebca6b;
h1 *= 0xc2b2ae35;
HASHING_SEED = h1;
}
/**
* Cached value of the alternative hashing algorithm result
*/
/**
* Calculates a 32-bit hash value for this string.
*
* @return a 32-bit hash value for this string.
*/
int hash32() {
int h = hash32;
if (0 == h) {
// harmless data race on hash32 here.
// ensure result is not zero to avoid recalcing
h = (0 != h) ? h : 1;
hash32 = h;
}
return h;
}
}