3202N/A * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * The {@code Float} class wraps a value of primitive type 0N/A * {@code float} in an object. An object of type 0N/A * {@code Float} contains a single field whose type is 0N/A * <p>In addition, this class provides several methods for converting a 0N/A * {@code float} to a {@code String} and a 0N/A * {@code String} to a {@code float}, as well as other 0N/A * constants and methods useful when dealing with a 0N/A * @author Lee Boynton 0N/A * @author Arthur van Hoff 0N/A * @author Joseph D. Darcy 0N/A * A constant holding the positive infinity of type 0N/A * {@code float}. It is equal to the value returned by 0N/A * {@code Float.intBitsToFloat(0x7f800000)}. 0N/A * A constant holding the negative infinity of type 0N/A * {@code float}. It is equal to the value returned by 0N/A * {@code Float.intBitsToFloat(0xff800000)}. 0N/A * A constant holding a Not-a-Number (NaN) value of type 0N/A * {@code float}. It is equivalent to the value returned by 0N/A * {@code Float.intBitsToFloat(0x7fc00000)}. 0N/A public static final float NaN =
0.0f /
0.0f;
0N/A * A constant holding the largest positive finite value of type 0N/A * {@code float}, (2-2<sup>-23</sup>)·2<sup>127</sup>. 0N/A * It is equal to the hexadecimal floating-point literal 0N/A * {@code 0x1.fffffeP+127f} and also equal to 0N/A * {@code Float.intBitsToFloat(0x7f7fffff)}. 0N/A * A constant holding the smallest positive normal value of type 0N/A * {@code float}, 2<sup>-126</sup>. It is equal to the 0N/A * hexadecimal floating-point literal {@code 0x1.0p-126f} and also 0N/A * equal to {@code Float.intBitsToFloat(0x00800000)}. 0N/A public static final float MIN_NORMAL =
0x1.
0p-
126f;
// 1.17549435E-38f 0N/A * A constant holding the smallest positive nonzero value of type 0N/A * {@code float}, 2<sup>-149</sup>. It is equal to the 0N/A * hexadecimal floating-point literal {@code 0x0.000002P-126f} 0N/A * and also equal to {@code Float.intBitsToFloat(0x1)}. 0N/A public static final float MIN_VALUE =
0x0.
000002P-
126f;
// 1.4e-45f 0N/A * Maximum exponent a finite {@code float} variable may have. It 0N/A * is equal to the value returned by {@code 0N/A * Math.getExponent(Float.MAX_VALUE)}. 0N/A * Minimum exponent a normalized {@code float} variable may have. 0N/A * It is equal to the value returned by {@code 0N/A * Math.getExponent(Float.MIN_NORMAL)}. 0N/A * The number of bits used to represent a {@code float} value. 0N/A * The {@code Class} instance representing the primitive type 0N/A * Returns a string representation of the {@code float} 0N/A * argument. All characters mentioned below are ASCII characters. 0N/A * <li>If the argument is NaN, the result is the string 0N/A * <li>Otherwise, the result is a string that represents the sign and 0N/A * magnitude (absolute value) of the argument. If the sign is 0N/A * negative, the first character of the result is 0N/A * '{@code -}' (<code>'\u002D'</code>); if the sign is 0N/A * positive, no sign character appears in the result. As for 0N/A * the magnitude <i>m</i>: 0N/A * <li>If <i>m</i> is infinity, it is represented by the characters 0N/A * {@code "Infinity"}; thus, positive infinity produces 0N/A * the result {@code "Infinity"} and negative infinity 0N/A * produces the result {@code "-Infinity"}. 0N/A * <li>If <i>m</i> is zero, it is represented by the characters 0N/A * {@code "0.0"}; thus, negative zero produces the result 0N/A * {@code "-0.0"} and positive zero produces the result 0N/A * <li> If <i>m</i> is greater than or equal to 10<sup>-3</sup> but 0N/A * less than 10<sup>7</sup>, then it is represented as the 0N/A * integer part of <i>m</i>, in decimal form with no leading 0N/A * zeroes, followed by '{@code .}' 0N/A * (<code>'\u002E'</code>), followed by one or more 0N/A * decimal digits representing the fractional part of 0N/A * <li> If <i>m</i> is less than 10<sup>-3</sup> or greater than or 0N/A * equal to 10<sup>7</sup>, then it is represented in 0N/A * so-called "computerized scientific notation." Let <i>n</i> 0N/A * be the unique integer such that 10<sup><i>n</i> </sup>≤ 0N/A * <i>m</i> {@literal <} 10<sup><i>n</i>+1</sup>; then let <i>a</i> 0N/A * be the mathematically exact quotient of <i>m</i> and 0N/A * 10<sup><i>n</i></sup> so that 1 ≤ <i>a</i> {@literal <} 10. 0N/A * The magnitude is then represented as the integer part of 0N/A * <i>a</i>, as a single decimal digit, followed by 0N/A * '{@code .}' (<code>'\u002E'</code>), followed by 0N/A * decimal digits representing the fractional part of 0N/A * <i>a</i>, followed by the letter '{@code E}' 0N/A * (<code>'\u0045'</code>), followed by a representation 0N/A * of <i>n</i> as a decimal integer, as produced by the 0N/A * method {@link java.lang.Integer#toString(int)}. 0N/A * How many digits must be printed for the fractional part of 0N/A * <i>m</i> or <i>a</i>? There must be at least one digit 0N/A * to represent the fractional part, and beyond that as many, but 0N/A * only as many, more digits as are needed to uniquely distinguish 0N/A * the argument value from adjacent values of type 0N/A * {@code float}. That is, suppose that <i>x</i> is the 0N/A * exact mathematical value represented by the decimal 0N/A * representation produced by this method for a finite nonzero 0N/A * argument <i>f</i>. Then <i>f</i> must be the {@code float} 0N/A * value nearest to <i>x</i>; or, if two {@code float} values are 0N/A * equally close to <i>x</i>, then <i>f</i> must be one of 0N/A * them and the least significant bit of the significand of 0N/A * <i>f</i> must be {@code 0}. 0N/A * <p>To create localized string representations of a floating-point 0N/A * value, use subclasses of {@link java.text.NumberFormat}. 0N/A * @param f the float to be converted. 0N/A * @return a string representation of the argument. 0N/A * Returns a hexadecimal string representation of the 0N/A * {@code float} argument. All characters mentioned below are 0N/A * <li>If the argument is NaN, the result is the string 0N/A * <li>Otherwise, the result is a string that represents the sign and 0N/A * magnitude (absolute value) of the argument. If the sign is negative, 0N/A * the first character of the result is '{@code -}' 0N/A * (<code>'\u002D'</code>); if the sign is positive, no sign character 0N/A * appears in the result. As for the magnitude <i>m</i>: 0N/A * <li>If <i>m</i> is infinity, it is represented by the string 0N/A * {@code "Infinity"}; thus, positive infinity produces the 0N/A * result {@code "Infinity"} and negative infinity produces 0N/A * the result {@code "-Infinity"}. 0N/A * <li>If <i>m</i> is zero, it is represented by the string 0N/A * {@code "0x0.0p0"}; thus, negative zero produces the result 0N/A * {@code "-0x0.0p0"} and positive zero produces the result 0N/A * {@code "0x0.0p0"}. 0N/A * <li>If <i>m</i> is a {@code float} value with a 0N/A * normalized representation, substrings are used to represent the 0N/A * significand and exponent fields. The significand is 0N/A * represented by the characters {@code "0x1."} 0N/A * followed by a lowercase hexadecimal representation of the rest 0N/A * of the significand as a fraction. Trailing zeros in the 0N/A * hexadecimal representation are removed unless all the digits 0N/A * are zero, in which case a single zero is used. Next, the 0N/A * exponent is represented by {@code "p"} followed 0N/A * by a decimal string of the unbiased exponent as if produced by 0N/A * a call to {@link Integer#toString(int) Integer.toString} on the 0N/A * <li>If <i>m</i> is a {@code float} value with a subnormal 0N/A * representation, the significand is represented by the 0N/A * characters {@code "0x0."} followed by a 0N/A * hexadecimal representation of the rest of the significand as a 0N/A * fraction. Trailing zeros in the hexadecimal representation are 0N/A * removed. Next, the exponent is represented by 0N/A * {@code "p-126"}. Note that there must be at 0N/A * least one nonzero digit in a subnormal significand. 0N/A * <caption><h3>Examples</h3></caption> 0N/A * <tr><th>Floating-point Value</th><th>Hexadecimal String</th> 0N/A * <tr><td>{@code 1.0}</td> <td>{@code 0x1.0p0}</td> 0N/A * <tr><td>{@code -1.0}</td> <td>{@code -0x1.0p0}</td> 0N/A * <tr><td>{@code 2.0}</td> <td>{@code 0x1.0p1}</td> 0N/A * <tr><td>{@code 3.0}</td> <td>{@code 0x1.8p1}</td> 0N/A * <tr><td>{@code 0.5}</td> <td>{@code 0x1.0p-1}</td> 0N/A * <tr><td>{@code 0.25}</td> <td>{@code 0x1.0p-2}</td> 0N/A * <tr><td>{@code Float.MAX_VALUE}</td> 0N/A * <td>{@code 0x1.fffffep127}</td> 0N/A * <tr><td>{@code Minimum Normal Value}</td> 0N/A * <td>{@code 0x1.0p-126}</td> 0N/A * <tr><td>{@code Maximum Subnormal Value}</td> 0N/A * <td>{@code 0x0.fffffep-126}</td> 0N/A * <tr><td>{@code Float.MIN_VALUE}</td> 0N/A * <td>{@code 0x0.000002p-126}</td> 0N/A * @param f the {@code float} to be converted. 0N/A * @return a hex string representation of the argument. 0N/A * @author Joseph D. Darcy 0N/A && f !=
0.0f ) {
// float subnormal 0N/A // Adjust exponent to create subnormal double, then 0N/A // replace subnormal double exponent with subnormal float 0N/A else // double string will be the same as float string 0N/A * Returns a {@code Float} object holding the 0N/A * {@code float} value represented by the argument string 0N/A * <p>If {@code s} is {@code null}, then a 0N/A * {@code NullPointerException} is thrown. 0N/A * <p>Leading and trailing whitespace characters in {@code s} 0N/A * are ignored. Whitespace is removed as if by the {@link 0N/A * String#trim} method; that is, both ASCII space and control 0N/A * characters are removed. The rest of {@code s} should 0N/A * constitute a <i>FloatValue</i> as described by the lexical 0N/A * <dt><i>FloatValue:</i> 0N/A * <dd><i>Sign<sub>opt</sub></i> {@code NaN} 0N/A * <dd><i>Sign<sub>opt</sub></i> {@code Infinity} 0N/A * <dd><i>Sign<sub>opt</sub> FloatingPointLiteral</i> 0N/A * <dd><i>Sign<sub>opt</sub> HexFloatingPointLiteral</i> 0N/A * <dd><i>SignedInteger</i> 0N/A * <dt><i>HexFloatingPointLiteral</i>: 0N/A * <dd> <i>HexSignificand BinaryExponent FloatTypeSuffix<sub>opt</sub></i> 0N/A * <dt><i>HexSignificand:</i> 0N/A * <dd><i>HexNumeral</i> 0N/A * <dd><i>HexNumeral</i> {@code .} 0N/A * <dd>{@code 0x} <i>HexDigits<sub>opt</sub> 0N/A * </i>{@code .}<i> HexDigits</i> 0N/A * <dd>{@code 0X}<i> HexDigits<sub>opt</sub> 0N/A * </i>{@code .} <i>HexDigits</i> 0N/A * <dt><i>BinaryExponent:</i> 0N/A * <dd><i>BinaryExponentIndicator SignedInteger</i> 0N/A * <dt><i>BinaryExponentIndicator:</i> 0N/A * where <i>Sign</i>, <i>FloatingPointLiteral</i>, 0N/A * <i>HexNumeral</i>, <i>HexDigits</i>, <i>SignedInteger</i> and 0N/A * <i>FloatTypeSuffix</i> are as defined in the lexical structure 4008N/A * <cite>The Java™ Language Specification</cite>, 4008N/A * except that underscores are not accepted between digits. 4008N/A * If {@code s} does not have the form of 0N/A * a <i>FloatValue</i>, then a {@code NumberFormatException} 0N/A * is thrown. Otherwise, {@code s} is regarded as 0N/A * representing an exact decimal value in the usual 0N/A * "computerized scientific notation" or as an exact 0N/A * hexadecimal value; this exact numerical value is then 0N/A * conceptually converted to an "infinitely precise" 0N/A * binary value that is then rounded to type {@code float} 0N/A * by the usual round-to-nearest rule of IEEE 754 floating-point 0N/A * arithmetic, which includes preserving the sign of a zero 807N/A * Note that the round-to-nearest rule also implies overflow and 807N/A * underflow behaviour; if the exact value of {@code s} is large 807N/A * enough in magnitude (greater than or equal to ({@link 807N/A * #MAX_VALUE} + {@link Math#ulp(float) ulp(MAX_VALUE)}/2), 807N/A * rounding to {@code float} will result in an infinity and if the 807N/A * exact value of {@code s} is small enough in magnitude (less 807N/A * than or equal to {@link #MIN_VALUE}/2), rounding to float will 807N/A * Finally, after rounding a {@code Float} object representing 807N/A * this {@code float} value is returned. 0N/A * <p>To interpret localized string representations of a 0N/A * floating-point value, use subclasses of {@link 0N/A * java.text.NumberFormat}. 0N/A * <p>Note that trailing format specifiers, specifiers that 0N/A * determine the type of a floating-point literal 0N/A * ({@code 1.0f} is a {@code float} value; 0N/A * {@code 1.0d} is a {@code double} value), do 0N/A * <em>not</em> influence the results of this method. In other 0N/A * words, the numerical value of the input string is converted 0N/A * directly to the target floating-point type. In general, the 0N/A * two-step sequence of conversions, string to {@code double} 0N/A * followed by {@code double} to {@code float}, is 0N/A * <em>not</em> equivalent to converting a string directly to 0N/A * {@code float}. For example, if first converted to an 0N/A * intermediate {@code double} and then to 0N/A * {@code float}, the string<br> 0N/A * {@code "1.00000017881393421514957253748434595763683319091796875001d"}<br> 0N/A * results in the {@code float} value 0N/A * {@code 1.0000002f}; if the string is converted directly to 0N/A * {@code float}, <code>1.000000<b>1</b>f</code> results. 0N/A * <p>To avoid calling this method on an invalid string and having 0N/A * a {@code NumberFormatException} be thrown, the documentation 0N/A * for {@link Double#valueOf Double.valueOf} lists a regular 0N/A * expression which can be used to screen the input. 0N/A * @param s the string to be parsed. 0N/A * @return a {@code Float} object holding the value 0N/A * represented by the {@code String} argument. 0N/A * @throws NumberFormatException if the string does not contain a 0N/A * Returns a {@code Float} instance representing the specified 0N/A * {@code float} value. 0N/A * If a new {@code Float} instance is not required, this method 0N/A * should generally be used in preference to the constructor 0N/A * {@link #Float(float)}, as this method is likely to yield 0N/A * significantly better space and time performance by caching 0N/A * frequently requested values. 0N/A * @param f a float value. 0N/A * @return a {@code Float} instance representing {@code f}. 0N/A * Returns a new {@code float} initialized to the value 0N/A * represented by the specified {@code String}, as performed 0N/A * by the {@code valueOf} method of class {@code Float}. 1419N/A * @param s the string to be parsed. 0N/A * @return the {@code float} value represented by the string 1419N/A * @throws NullPointerException if the string is null 1419N/A * @throws NumberFormatException if the string does not contain a 0N/A * parsable {@code float}. 1419N/A * @see java.lang.Float#valueOf(String) 0N/A * Returns {@code true} if the specified number is a 0N/A * Not-a-Number (NaN) value, {@code false} otherwise. 0N/A * @param v the value to be tested. 0N/A * @return {@code true} if the argument is NaN; 0N/A * {@code false} otherwise. 0N/A * Returns {@code true} if the specified number is infinitely 0N/A * large in magnitude, {@code false} otherwise. 0N/A * @param v the value to be tested. 0N/A * @return {@code true} if the argument is positive infinity or 0N/A * negative infinity; {@code false} otherwise. 0N/A * The value of the Float. 0N/A * Constructs a newly allocated {@code Float} object that 0N/A * represents the primitive {@code float} argument. 0N/A * @param value the value to be represented by the {@code Float}. 0N/A * Constructs a newly allocated {@code Float} object that 0N/A * represents the argument converted to type {@code float}. 0N/A * @param value the value to be represented by the {@code Float}. 0N/A * Constructs a newly allocated {@code Float} object that 0N/A * represents the floating-point value of type {@code float} 0N/A * represented by the string. The string is converted to a 0N/A * {@code float} value as if by the {@code valueOf} method. 0N/A * @param s a string to be converted to a {@code Float}. 0N/A * @throws NumberFormatException if the string does not contain a 0N/A * @see java.lang.Float#valueOf(java.lang.String) 0N/A // REMIND: this is inefficient 0N/A * Returns {@code true} if this {@code Float} value is a 0N/A * Not-a-Number (NaN), {@code false} otherwise. 0N/A * @return {@code true} if the value represented by this object is 0N/A * NaN; {@code false} otherwise. 0N/A * Returns {@code true} if this {@code Float} value is 0N/A * infinitely large in magnitude, {@code false} otherwise. 0N/A * @return {@code true} if the value represented by this object is 0N/A * positive infinity or negative infinity; 0N/A * {@code false} otherwise. 0N/A * Returns a string representation of this {@code Float} object. 0N/A * The primitive {@code float} value represented by this object 0N/A * is converted to a {@code String} exactly as if by the method 0N/A * {@code toString} of one argument. 0N/A * @return a {@code String} representation of this object. 0N/A * @see java.lang.Float#toString(float) 0N/A * Returns the value of this {@code Float} as a {@code byte} (by 0N/A * casting to a {@code byte}). 0N/A * @return the {@code float} value represented by this object 0N/A * converted to type {@code byte} 0N/A * Returns the value of this {@code Float} as a {@code short} (by 0N/A * casting to a {@code short}). 0N/A * @return the {@code float} value represented by this object 0N/A * converted to type {@code short} 0N/A * Returns the value of this {@code Float} as an {@code int} (by 0N/A * casting to type {@code int}). 0N/A * @return the {@code float} value represented by this object 0N/A * converted to type {@code int} 0N/A * Returns value of this {@code Float} as a {@code long} (by 0N/A * casting to type {@code long}). 0N/A * @return the {@code float} value represented by this object 0N/A * converted to type {@code long} 0N/A * Returns the {@code float} value of this {@code Float} object. 0N/A * @return the {@code float} value represented by this object 0N/A * Returns the {@code double} value of this {@code Float} object. 0N/A * @return the {@code float} value represented by this 0N/A * object is converted to type {@code double} and the 0N/A * result of the conversion is returned. 0N/A * Returns a hash code for this {@code Float} object. The 0N/A * result is the integer bit representation, exactly as produced 0N/A * by the method {@link #floatToIntBits(float)}, of the primitive 0N/A * {@code float} value represented by this {@code Float} 0N/A * @return a hash code value for this object. 0N/A * Compares this object against the specified object. The result 0N/A * is {@code true} if and only if the argument is not 0N/A * {@code null} and is a {@code Float} object that 0N/A * represents a {@code float} with the same value as the 0N/A * {@code float} represented by this object. For this 0N/A * purpose, two {@code float} values are considered to be the 0N/A * same if and only if the method {@link #floatToIntBits(float)} 0N/A * returns the identical {@code int} value when applied to 0N/A * <p>Note that in most cases, for two instances of class 0N/A * {@code Float}, {@code f1} and {@code f2}, the value 0N/A * of {@code f1.equals(f2)} is {@code true} if and only if 0N/A * f1.floatValue() == f2.floatValue() 0N/A * </pre></blockquote> 0N/A * <p>also has the value {@code true}. However, there are two exceptions: 0N/A * <li>If {@code f1} and {@code f2} both represent 0N/A * {@code Float.NaN}, then the {@code equals} method returns 0N/A * {@code true}, even though {@code Float.NaN==Float.NaN} 0N/A * has the value {@code false}. 0N/A * <li>If {@code f1} represents {@code +0.0f} while 0N/A * {@code f2} represents {@code -0.0f}, or vice 0N/A * versa, the {@code equal} test has the value 0N/A * {@code false}, even though {@code 0.0f==-0.0f} 0N/A * has the value {@code true}. 0N/A * This definition allows hash tables to operate properly. 0N/A * @param obj the object to be compared 0N/A * @return {@code true} if the objects are the same; 0N/A * {@code false} otherwise. 0N/A * @see java.lang.Float#floatToIntBits(float) 0N/A * Returns a representation of the specified floating-point value 0N/A * according to the IEEE 754 floating-point "single format" bit 0N/A * <p>Bit 31 (the bit that is selected by the mask 0N/A * {@code 0x80000000}) represents the sign of the floating-point 0N/A * Bits 30-23 (the bits that are selected by the mask 0N/A * {@code 0x7f800000}) represent the exponent. 0N/A * Bits 22-0 (the bits that are selected by the mask 0N/A * {@code 0x007fffff}) represent the significand (sometimes called 0N/A * the mantissa) of the floating-point number. 0N/A * <p>If the argument is positive infinity, the result is 0N/A * {@code 0x7f800000}. 0N/A * <p>If the argument is negative infinity, the result is 0N/A * {@code 0xff800000}. 0N/A * <p>If the argument is NaN, the result is {@code 0x7fc00000}. 0N/A * <p>In all cases, the result is an integer that, when given to the 0N/A * {@link #intBitsToFloat(int)} method, will produce a floating-point 0N/A * value the same as the argument to {@code floatToIntBits} 0N/A * (except all NaN values are collapsed to a single 0N/A * "canonical" NaN value). 0N/A * @param value a floating-point number. 0N/A * @return the bits that represent the floating-point number. 0N/A // Check for NaN based on values of bit fields, maximum 0N/A // exponent and nonzero significand. 0N/A * Returns a representation of the specified floating-point value 0N/A * according to the IEEE 754 floating-point "single format" bit 0N/A * layout, preserving Not-a-Number (NaN) values. 0N/A * <p>Bit 31 (the bit that is selected by the mask 0N/A * {@code 0x80000000}) represents the sign of the floating-point 0N/A * Bits 30-23 (the bits that are selected by the mask 0N/A * {@code 0x7f800000}) represent the exponent. 0N/A * Bits 22-0 (the bits that are selected by the mask 0N/A * {@code 0x007fffff}) represent the significand (sometimes called 0N/A * the mantissa) of the floating-point number. 0N/A * <p>If the argument is positive infinity, the result is 0N/A * {@code 0x7f800000}. 0N/A * <p>If the argument is negative infinity, the result is 0N/A * {@code 0xff800000}. 0N/A * <p>If the argument is NaN, the result is the integer representing 0N/A * the actual NaN value. Unlike the {@code floatToIntBits} 0N/A * method, {@code floatToRawIntBits} does not collapse all the 0N/A * bit patterns encoding a NaN to a single "canonical" 0N/A * <p>In all cases, the result is an integer that, when given to the 0N/A * {@link #intBitsToFloat(int)} method, will produce a 0N/A * floating-point value the same as the argument to 0N/A * {@code floatToRawIntBits}. 0N/A * @param value a floating-point number. 0N/A * @return the bits that represent the floating-point number. 0N/A * Returns the {@code float} value corresponding to a given 0N/A * bit representation. 0N/A * The argument is considered to be a representation of a 0N/A * floating-point value according to the IEEE 754 floating-point 0N/A * "single format" bit layout. 0N/A * <p>If the argument is {@code 0x7f800000}, the result is positive 0N/A * <p>If the argument is {@code 0xff800000}, the result is negative 0N/A * <p>If the argument is any value in the range 0N/A * {@code 0x7f800001} through {@code 0x7fffffff} or in 0N/A * the range {@code 0xff800001} through 0N/A * {@code 0xffffffff}, the result is a NaN. No IEEE 754 0N/A * floating-point operation provided by Java can distinguish 0N/A * between two NaN values of the same type with different bit 0N/A * patterns. Distinct values of NaN are only distinguishable by 0N/A * use of the {@code Float.floatToRawIntBits} method. 0N/A * <p>In all other cases, let <i>s</i>, <i>e</i>, and <i>m</i> be three 0N/A * values that can be computed from the argument: 0N/A * int s = ((bits >> 31) == 0) ? 1 : -1; 0N/A * int e = ((bits >> 23) & 0xff); 0N/A * int m = (e == 0) ? 0N/A * (bits & 0x7fffff) << 1 : 0N/A * (bits & 0x7fffff) | 0x800000; 0N/A * </pre></blockquote> 0N/A * Then the floating-point result equals the value of the mathematical 0N/A * expression <i>s</i>·<i>m</i>·2<sup><i>e</i>-150</sup>. 0N/A * <p>Note that this method may not be able to return a 0N/A * {@code float} NaN with exactly same bit pattern as the 0N/A * {@code int} argument. IEEE 754 distinguishes between two 0N/A * kinds of NaNs, quiet NaNs and <i>signaling NaNs</i>. The 0N/A * differences between the two kinds of NaN are generally not 0N/A * visible in Java. Arithmetic operations on signaling NaNs turn 0N/A * them into quiet NaNs with a different, but often similar, bit 0N/A * pattern. However, on some processors merely copying a 0N/A * signaling NaN also performs that conversion. In particular, 0N/A * copying a signaling NaN to return it to the calling method may 0N/A * perform this conversion. So {@code intBitsToFloat} may 0N/A * not be able to return a {@code float} with a signaling NaN 0N/A * bit pattern. Consequently, for some {@code int} values, 0N/A * {@code floatToRawIntBits(intBitsToFloat(start))} may 0N/A * <i>not</i> equal {@code start}. Moreover, which 0N/A * particular bit patterns represent signaling NaNs is platform 0N/A * dependent; although all NaN bit patterns, quiet or signaling, 0N/A * must be in the NaN range identified above. 0N/A * @param bits an integer. 0N/A * @return the {@code float} floating-point value with the same bit 0N/A * Compares two {@code Float} objects numerically. There are 0N/A * two ways in which comparisons performed by this method differ 0N/A * from those performed by the Java language numerical comparison 0N/A * operators ({@code <, <=, ==, >=, >}) when 0N/A * applied to primitive {@code float} values: 0N/A * {@code Float.NaN} is considered by this method to 0N/A * be equal to itself and greater than all other 0N/A * {@code float} values 0N/A * (including {@code Float.POSITIVE_INFINITY}). 0N/A * {@code 0.0f} is considered by this method to be greater 0N/A * than {@code -0.0f}. 0N/A * This ensures that the <i>natural ordering</i> of {@code Float} 0N/A * objects imposed by this method is <i>consistent with equals</i>. 0N/A * @param anotherFloat the {@code Float} to be compared. 0N/A * @return the value {@code 0} if {@code anotherFloat} is 0N/A * numerically equal to this {@code Float}; a value 0N/A * less than {@code 0} if this {@code Float} 0N/A * is numerically less than {@code anotherFloat}; 0N/A * and a value greater than {@code 0} if this 0N/A * {@code Float} is numerically greater than 0N/A * {@code anotherFloat}. 0N/A * @see Comparable#compareTo(Object) 0N/A * Compares the two specified {@code float} values. The sign 0N/A * of the integer value returned is the same as that of the 0N/A * integer that would be returned by the call: 0N/A * new Float(f1).compareTo(new Float(f2)) 0N/A * @param f1 the first {@code float} to compare. 0N/A * @param f2 the second {@code float} to compare. 0N/A * @return the value {@code 0} if {@code f1} is 0N/A * numerically equal to {@code f2}; a value less than 0N/A * {@code 0} if {@code f1} is numerically less than 0N/A * {@code f2}; and a value greater than {@code 0} 0N/A * if {@code f1} is numerically greater than 0N/A return -
1;
// Neither val is NaN, thisVal is smaller 0N/A return 1;
// Neither val is NaN, thisVal is larger 3202N/A // Cannot use floatToRawIntBits because of possibility of NaNs. 0N/A 1));
// (0.0, -0.0) or (NaN, !NaN) 0N/A /** use serialVersionUID from JDK 1.0.2 for interoperability */