1 /*

     2  * Copyright 1997 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 

    25 /* @test

    26    @bug 4017414

    27    @summary Check for correct implementation of PushbackInputStream.available

    28    */

    29 

    30 import java.io.*;

    31 

    32 

    33 

    34 public class Available{

    35 

    36     private static void dotest(PushbackInputStream in , int expected)

    37         throws Exception

    38     {

    39 

    40         int got = in.available();

    41         System.err.println("available must be " + expected + " , got : " + got);

    42         if (got != expected) {

    43             throw new

    44                 RuntimeException("Unexpected number of bytes available in the PushBackInputStream");

    45         }

    46 

    47     }

    48 

    49 

    50 

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

    52 

    53         PushbackInputStream in = new

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

    55 

    56         dotest(in , 10);

    57 

    58         in.read();

    59         dotest(in , 9);

    60 

    61         in.unread(20);

    62         dotest(in , 10);

    63 

    64         in.unread(20);

    65         dotest(in , 11);

    66 

    67     }

    68 

    69 }