Quelle GrowAfterEOF.java Sprache: JAVA

/*
* Copyright (c) 1998, 2010, 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 4101707
   @summary Test if fill() will behave correctly at EOF to
            allow file to grow.
*/

import java.io.*;

public class GrowAfterEOF {
    public static void main(String[] args) throws Exception {
        File input = new File(".", "TestEOFInput.txt");
        RandomAccessFile rf = new RandomAccessFile(input, "rw");
        try {
            BufferedReader r = new BufferedReader
                (new InputStreamReader(new FileInputStream(input)));
            try {
                // write something
                rf.writeBytes("a line");

                // read till the end of file
                while (r.readLine() != null);

                // append to the end of the file
                rf.seek(rf.length());
                rf.writeBytes("new line");

                // now try to read again
                boolean readMore = false;
                while (r.readLine() != null) {
                    readMore = true;
                }
                if (!readMore) {
                    input.delete();
                    throw new Exception("Failed test: unable to read!");
                } else {
                    input.delete();
                }
            } finally {
                r.close();
            }
        } finally {
            rf.close();
        }
    }
}

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