test/jdk/java/lang/StringBuilder/HugeCapacity.java

/*
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 * 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.
 *
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 */

/**
 * @test
 * @bug 8149330
 * @summary Capacity should not get close to Integer.MAX_VALUE unless
 *          necessary
 * @run main/othervm -Xmx5G HugeCapacity
 * @ignore This test has huge memory requirements
 */

public class HugeCapacity {
    private static int failures = 0;

    public static void main(String[] args) {
        testLatin1();
        testUtf16();
        if (failures > 0) {
            throw new RuntimeException(failures + " tests failed");
        }
    }

    private static void testLatin1() {
        try {
            StringBuilder sb = new StringBuilder();
            sb.ensureCapacity(Integer.MAX_VALUE / 2);
            sb.ensureCapacity(Integer.MAX_VALUE / 2 + 1);
        } catch (OutOfMemoryError oom) {
            oom.printStackTrace();
            failures++;
        }
    }

    private static void testUtf16() {
        try {
            StringBuilder sb = new StringBuilder();
            sb.append('\u042b');
            sb.ensureCapacity(Integer.MAX_VALUE / 4);
            sb.ensureCapacity(Integer.MAX_VALUE / 4 + 1);
        } catch (OutOfMemoryError oom) {
            oom.printStackTrace();
            failures++;
        }
    }
}