--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/lang/StringBuffer/Capacity.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,86 @@
+/*
+ * 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");}
+}