test/java/nio/Buffer/AllocateDirectInit.java

/*
 * Copyright (c) 2001, 2007, Oracle and/or its affiliates. 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
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 * questions.
 */

/**
 * @test
 * @bug 4490253 6535542
 * @summary Verify that newly allocated direct buffers are initialized.
 */

import java.nio.ByteBuffer;

public class AllocateDirectInit {
    public static void main(String [] args){
        for (int i = 0; i < 1024; i++) {
            ByteBuffer bb = ByteBuffer.allocateDirect(1024);
//          printByteBuffer(bb);
            for (bb.position(0); bb.position() < bb.limit(); ) {
                if ((bb.get() & 0xff) != 0)
                    throw new RuntimeException("uninitialized buffer, position = "
                                               + bb.position());
            }
        }
    }

    private static void printByteBuffer(ByteBuffer bb) {
        System.out.print("byte [");
        for (bb.position(0); bb.position() < bb.limit(); )
            System.out.print(" " + Integer.toHexString(bb.get() & 0xff));
        System.out.println(" ]");
    }
}