109 lines
3.2 KiB
Java
109 lines
3.2 KiB
Java
/*
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* Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4030173 4071548
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* @summary Verify correct conversion of non-string arguments in string concatenation.
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* @author maddox
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*
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* @compile StringConversion.java
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* @run main StringConversion
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*/
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class FooBar {
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public String toString(){
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return null;
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}
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}
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public class StringConversion {
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static void check(int testid, String have, String expect)
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throws Exception {
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if ((have == null && have != expect) ||
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(have != null && !have.equals(expect))) {
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String msg =
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"TEST " + testid + ": HAVE \"" +
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have + "\" EXPECT \"" + expect + "\"";
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System.out.println("StringConversion: " + msg);
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throw new Exception(msg);
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}
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}
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public static void main(String[] args) throws Exception {
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String s;
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String n = null;
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Object o = null;
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FooBar m = new FooBar();
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// Null reference must be converted to "null"
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// Conversion will be done by 'StringBuffer.append'.
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s = "foo" + n;
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check(11, s, "foonull");
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s = n + "bar";
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check(12, s, "nullbar");
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s = "foo" + o;
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check(13, s, "foonull");
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s = o + "bar";
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check(14, s, "nullbar");
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// Conversion will be done by 'String.valueOf'.
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s = "" + n;
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check(21, s, "null");
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s = n + "";
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check(22, s, "null");
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s = "" + o;
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check(23, s, "null");
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s = o + "";
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check(24, s, "null");
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// Null 'toString' result must be converted to "null"
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// Conversion will be done by 'StringBuffer.append'.
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s = "foo" + m;
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check(31, s, "foonull");
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s = m + "bar";
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check(32, s, "nullbar");
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// Conversion will be done by 'String.valueOf'.
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s = "" + m;
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check(43, s, "null");
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s = m + "";
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check(44, s, "null");
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// A character array must be converted as if by
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// 'toString', i.e., it is treated as an 'Object'.
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s = "polymorph";
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char[] ca = {'i', 's', 'm'};
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check(51, s + ca, s + ca.toString());
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check(52, ca + s, ca.toString() + s);
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System.out.println("OK");
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}
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}
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