87 lines
3.5 KiB
Java
87 lines
3.5 KiB
Java
/*
|
|
* Copyright 2010 Google Inc. 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 6952330
|
|
* @summary Test StringBuffer/StringBuilder capacity handling.
|
|
* @key randomness
|
|
*/
|
|
|
|
import java.util.Random;
|
|
|
|
public class Capacity {
|
|
void test(String[] args) throws Throwable {
|
|
Random rnd = new Random();
|
|
int[] sizes = { 0, 1, rnd.nextInt(10), rnd.nextInt(1000) };
|
|
for (int size : sizes) {
|
|
equal(16, new StringBuffer().capacity());
|
|
equal(16, new StringBuilder().capacity());
|
|
StringBuffer buff = new StringBuffer(size);
|
|
StringBuilder bild = new StringBuilder(size);
|
|
equal(size, buff.capacity());
|
|
equal(size, bild.capacity());
|
|
buff.ensureCapacity(size);
|
|
bild.ensureCapacity(size);
|
|
equal(size, buff.capacity());
|
|
equal(size, bild.capacity());
|
|
buff.ensureCapacity(size+1);
|
|
bild.ensureCapacity(size+1);
|
|
equal(size*2+2, buff.capacity());
|
|
equal(size*2+2, bild.capacity());
|
|
size = buff.capacity();
|
|
buff.ensureCapacity(size*2+1);
|
|
bild.ensureCapacity(size*2+1);
|
|
equal(size*2+2, buff.capacity());
|
|
equal(size*2+2, bild.capacity());
|
|
size = buff.capacity();
|
|
int newSize = size * 2 + 3;
|
|
buff.ensureCapacity(newSize);
|
|
bild.ensureCapacity(newSize);
|
|
equal(newSize, buff.capacity());
|
|
equal(newSize, bild.capacity());
|
|
buff.ensureCapacity(0);
|
|
bild.ensureCapacity(0);
|
|
equal(newSize, buff.capacity());
|
|
equal(newSize, bild.capacity());
|
|
}
|
|
}
|
|
|
|
//--------------------- Infrastructure ---------------------------
|
|
volatile int passed = 0, failed = 0;
|
|
void pass() {passed++;}
|
|
void fail() {failed++; Thread.dumpStack();}
|
|
void fail(String msg) {System.err.println(msg); fail();}
|
|
void unexpected(Throwable t) {failed++; t.printStackTrace();}
|
|
void check(boolean cond) {if (cond) pass(); else fail();}
|
|
void equal(Object x, Object y) {
|
|
if (x == null ? y == null : x.equals(y)) pass();
|
|
else fail(x + " not equal to " + y);}
|
|
public static void main(String[] args) throws Throwable {
|
|
new Capacity().instanceMain(args);}
|
|
public void instanceMain(String[] args) throws Throwable {
|
|
try {test(args);} catch (Throwable t) {unexpected(t);}
|
|
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
|
|
if (failed > 0) throw new AssertionError("Some tests failed");}
|
|
}
|