1 /*

     2  * Copyright 1998 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 /* @test

    25    @bug 4101707

    26    @summary Test if fill() will behave correctly at EOF to

    27             allow file to grow.

    28 */

    29 

    30 import java.io.*;

    31 

    32 public class GrowAfterEOF {

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

    34         File input = new File(".", "TestEOFInput.txt");

    35         RandomAccessFile rf = new RandomAccessFile(input, "rw");

    36         BufferedReader r = new BufferedReader

    37             (new InputStreamReader(new FileInputStream(input)));

    38 

    39         // write something

    40         rf.writeBytes("a line");

    41 

    42         // read till the end of file

    43         while (r.readLine() != null);

    44 

    45         // append to the end of the file

    46         rf.seek(rf.length());

    47         rf.writeBytes("new line");

    48 

    49         // now try to read again

    50         boolean readMore = false;

    51         while (r.readLine() != null) {

    52             readMore = true;

    53         }

    54         if (!readMore) {

    55             input.delete();

    56             throw new Exception("Failed test: unable to read!");

    57         } else {

    58             input.delete();

    59         }

    60     }

    61 }