| /* |
| * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * 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. |
| */ |
| |
| /* |
| * @test |
| * @bug 4030173 4071548 |
| * @summary Verify correct conversion of non-string arguments in string concatenation. |
| * @author maddox |
| * |
| * @compile StringConversion.java |
| * @run main StringConversion |
| */ |
| |
| class FooBar { |
| public String toString(){ |
| return null; |
| } |
| } |
| |
| public class StringConversion { |
| |
| static void check(int testid, String have, String expect) |
| throws Exception { |
| if ((have == null && have != expect) || |
| (have != null && !have.equals(expect))) { |
| String msg = |
| "TEST " + testid + ": HAVE \"" + |
| have + "\" EXPECT \"" + expect + "\""; |
| System.out.println("StringConversion: " + msg); |
| throw new Exception(msg); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| |
| String s; |
| String n = null; |
| Object o = null; |
| FooBar m = new FooBar(); |
| |
| // Null reference must be converted to "null" |
| |
| // Conversion will be done by 'StringBuffer.append'. |
| s = "foo" + n; |
| check(11, s, "foonull"); |
| s = n + "bar"; |
| check(12, s, "nullbar"); |
| s = "foo" + o; |
| check(13, s, "foonull"); |
| s = o + "bar"; |
| check(14, s, "nullbar"); |
| |
| // Conversion will be done by 'String.valueOf'. |
| s = "" + n; |
| check(21, s, "null"); |
| s = n + ""; |
| check(22, s, "null"); |
| s = "" + o; |
| check(23, s, "null"); |
| s = o + ""; |
| check(24, s, "null"); |
| |
| // Null 'toString' result must be converted to "null" |
| |
| // Conversion will be done by 'StringBuffer.append'. |
| s = "foo" + m; |
| check(31, s, "foonull"); |
| s = m + "bar"; |
| check(32, s, "nullbar"); |
| |
| // Conversion will be done by 'String.valueOf'. |
| s = "" + m; |
| check(43, s, "null"); |
| s = m + ""; |
| check(44, s, "null"); |
| |
| // A character array must be converted as if by |
| // 'toString', i.e., it is treated as an 'Object'. |
| |
| s = "polymorph"; |
| char[] ca = {'i', 's', 'm'}; |
| |
| check(51, s + ca, s + ca.toString()); |
| check(52, ca + s, ca.toString() + s); |
| |
| System.out.println("OK"); |
| } |
| } |