Quelle Available.java Sprache: JAVA

/*
* Copyright (c) 1997, 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 4017414
   @summary Check for correct implementation of PushbackInputStream.available
   */

import java.io.*;

public class Available{

    private static void dotest(PushbackInputStream in , int expected)
        throws Exception
    {

        int got = in.available();
        System.err.println("available must be " + expected + " , got : " + got);
        if (got != expected) {
            throw new
                RuntimeException("Unexpected number of bytes available in the PushBackInputStream");
        }

    }

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

        PushbackInputStream in = new
            PushbackInputStream(new ByteArrayInputStream(new byte[10]),5);

        dotest(in , 10);

        in.read();
        dotest(in , 9);

        in.unread(20);
        dotest(in , 10);

        in.unread(20);
        dotest(in , 11);

    }

}

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