/*

 * Copyright (c) 2018, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

 * @bug 8191416

 * @summary Verify no UnsupportedOperationException for cast subclass

 */

import java.nio.ByteBuffer;

import java.nio.MappedByteBuffer;

public class SubclassCastUOE {

    public static void main(String[] args) throws Exception {

        ByteBuffer buf = ByteBuffer.allocateDirect(37);

        if (!(buf instanceof MappedByteBuffer)) {

            throw new RuntimeException("Direct buffer not a MappedByteBuffer");

        }

        if (((MappedByteBuffer)buf).load() != buf) {

            throw new RuntimeException("load() did not return same buffer");

        }

        if (!((MappedByteBuffer)buf).isLoaded()) {

            throw new RuntimeException("isLoaded() returned false");

        }

        if (((MappedByteBuffer)buf).force() != buf) {

            throw new RuntimeException("force() did not return same buffer");

        }

    }

}