Tue, 21 May 2013 13:50:56 +0100
8005207: test has 2 @bug tags
Reviewed-by: mcimadamore
1 /*
2 * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
24 /*
25 * @test
26 * @bug 4030173 4071548
27 * @summary Verify correct conversion of non-string arguments in string concatenation.
28 * @author maddox
29 *
30 * @compile StringConversion.java
31 * @run main StringConversion
32 */
34 class FooBar {
35 public String toString(){
36 return null;
37 }
38 }
40 public class StringConversion {
42 static void check(int testid, String have, String expect)
43 throws Exception {
44 if ((have == null && have != expect) ||
45 (have != null && !have.equals(expect))) {
46 String msg =
47 "TEST " + testid + ": HAVE \"" +
48 have + "\" EXPECT \"" + expect + "\"";
49 System.out.println("StringConversion: " + msg);
50 throw new Exception(msg);
51 }
52 }
54 public static void main(String[] args) throws Exception {
56 String s;
57 String n = null;
58 Object o = null;
59 FooBar m = new FooBar();
61 // Null reference must be converted to "null"
63 // Conversion will be done by 'StringBuffer.append'.
64 s = "foo" + n;
65 check(11, s, "foonull");
66 s = n + "bar";
67 check(12, s, "nullbar");
68 s = "foo" + o;
69 check(13, s, "foonull");
70 s = o + "bar";
71 check(14, s, "nullbar");
73 // Conversion will be done by 'String.valueOf'.
74 s = "" + n;
75 check(21, s, "null");
76 s = n + "";
77 check(22, s, "null");
78 s = "" + o;
79 check(23, s, "null");
80 s = o + "";
81 check(24, s, "null");
83 // Null 'toString' result must be converted to "null"
85 // Conversion will be done by 'StringBuffer.append'.
86 s = "foo" + m;
87 check(31, s, "foonull");
88 s = m + "bar";
89 check(32, s, "nullbar");
91 // Conversion will be done by 'String.valueOf'.
92 s = "" + m;
93 check(43, s, "null");
94 s = m + "";
95 check(44, s, "null");
97 // A character array must be converted as if by
98 // 'toString', i.e., it is treated as an 'Object'.
100 s = "polymorph";
101 char[] ca = {'i', 's', 'm'};
103 check(51, s + ca, s + ca.toString());
104 check(52, ca + s, ca.toString() + s);
106 System.out.println("OK");
107 }
108 }