0N/A/*
553N/A * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
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
0N/A * published by the Free Software Foundation.
0N/A *
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 *
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.
0N/A *
553N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
553N/A * or visit www.oracle.com if you need additional information or have any
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0N/A */
0N/A
0N/A/*
0N/A * @test
0N/A * @bug 4030173 4071548
0N/A * @summary Verify correct conversion of non-string arguments in string concatenation.
0N/A * @author maddox
0N/A *
0N/A * @compile StringConversion.java
0N/A * @run main StringConversion
0N/A */
0N/A
0N/Aclass FooBar {
0N/A public String toString(){
0N/A return null;
0N/A }
0N/A}
0N/A
0N/Apublic class StringConversion {
0N/A
0N/A static void check(int testid, String have, String expect)
0N/A throws Exception {
0N/A if ((have == null && have != expect) ||
0N/A (have != null && !have.equals(expect))) {
0N/A String msg =
0N/A "TEST " + testid + ": HAVE \"" +
0N/A have + "\" EXPECT \"" + expect + "\"";
0N/A System.out.println("StringConversion: " + msg);
0N/A throw new Exception(msg);
0N/A }
0N/A }
0N/A
0N/A public static void main(String[] args) throws Exception {
0N/A
0N/A String s;
0N/A String n = null;
0N/A Object o = null;
0N/A FooBar m = new FooBar();
0N/A
0N/A // Null reference must be converted to "null"
0N/A
0N/A // Conversion will be done by 'StringBuffer.append'.
0N/A s = "foo" + n;
0N/A check(11, s, "foonull");
0N/A s = n + "bar";
0N/A check(12, s, "nullbar");
0N/A s = "foo" + o;
0N/A check(13, s, "foonull");
0N/A s = o + "bar";
0N/A check(14, s, "nullbar");
0N/A
0N/A // Conversion will be done by 'String.valueOf'.
0N/A s = "" + n;
0N/A check(21, s, "null");
0N/A s = n + "";
0N/A check(22, s, "null");
0N/A s = "" + o;
0N/A check(23, s, "null");
0N/A s = o + "";
0N/A check(24, s, "null");
0N/A
0N/A // Null 'toString' result must be converted to "null"
0N/A
0N/A // Conversion will be done by 'StringBuffer.append'.
0N/A s = "foo" + m;
0N/A check(31, s, "foonull");
0N/A s = m + "bar";
0N/A check(32, s, "nullbar");
0N/A
0N/A // Conversion will be done by 'String.valueOf'.
0N/A s = "" + m;
0N/A check(43, s, "null");
0N/A s = m + "";
0N/A check(44, s, "null");
0N/A
0N/A // A character array must be converted as if by
0N/A // 'toString', i.e., it is treated as an 'Object'.
0N/A
0N/A s = "polymorph";
0N/A char[] ca = {'i', 's', 'm'};
0N/A
0N/A check(51, s + ca, s + ca.toString());
0N/A check(52, ca + s, ca.toString() + s);
0N/A
0N/A System.out.println("OK");
0N/A }
0N/A}