1 /*
2 * Copyright 2010 Google Inc. 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 */
23
24 /*
25 * @test
26 * @bug 6952330
27 * @summary Test StringBuffer/StringBuilder capacity handling.
28 * @key randomness
29 */
30
31 import java.util.Random;
32
33 public class Capacity {
34 void test(String[] args) throws Throwable {
35 Random rnd = new Random();
36 int[] sizes = { 0, 1, rnd.nextInt(10), rnd.nextInt(1000) };
37 for (int size : sizes) {
38 equal(16, new StringBuffer().capacity());
39 equal(16, new StringBuilder().capacity());
40 StringBuffer buff = new StringBuffer(size);
41 StringBuilder bild = new StringBuilder(size);
42 equal(size, buff.capacity());
43 equal(size, bild.capacity());
44 buff.ensureCapacity(size);
45 bild.ensureCapacity(size);
46 equal(size, buff.capacity());
47 equal(size, bild.capacity());
48 buff.ensureCapacity(size+1);
49 bild.ensureCapacity(size+1);
50 equal(size*2+2, buff.capacity());
51 equal(size*2+2, bild.capacity());
52 size = buff.capacity();
53 buff.ensureCapacity(size*2+1);
54 bild.ensureCapacity(size*2+1);
55 equal(size*2+2, buff.capacity());
56 equal(size*2+2, bild.capacity());
57 size = buff.capacity();
58 int newSize = size * 2 + 3;
59 buff.ensureCapacity(newSize);
60 bild.ensureCapacity(newSize);
61 equal(newSize, buff.capacity());
62 equal(newSize, bild.capacity());
63 buff.ensureCapacity(0);
64 bild.ensureCapacity(0);
65 equal(newSize, buff.capacity());
66 equal(newSize, bild.capacity());
67 }
68 }
69
70 //--------------------- Infrastructure ---------------------------
71 volatile int passed = 0, failed = 0;
72 void pass() {passed++;}
73 void fail() {failed++; Thread.dumpStack();}
74 void fail(String msg) {System.err.println(msg); fail();}
75 void unexpected(Throwable t) {failed++; t.printStackTrace();}
76 void check(boolean cond) {if (cond) pass(); else fail();}
77 void equal(Object x, Object y) {
78 if (x == null ? y == null : x.equals(y)) pass();
79 else fail(x + " not equal to " + y);}
80 public static void main(String[] args) throws Throwable {
81 new Capacity().instanceMain(args);}
82 public void instanceMain(String[] args) throws Throwable {
83 try {test(args);} catch (Throwable t) {unexpected(t);}
84 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
85 if (failed > 0) throw new AssertionError("Some tests failed");}
86 }