io/RandomAccessFile/ReadLine.java

/*
 * Copyright (c) 1997, 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.
 *
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 * questions.
 */

/* @test
   @bug 1238814
   @summary check for correct implementation of RandomAccessFile.readLine
   */

import java.io.*;

public class ReadLine {

    public static void main(String args[]) throws Exception {
        File fn = new File("x.ReadLine");
        RandomAccessFile raf = new RandomAccessFile(fn,"rw");
        try {
            String line;
            int ctr = 1;
            String expected;

            raf.writeBytes
                ("ln1\rln2\r\nln3\nln4\rln5\r\nln6\n\rln8\r\rln10\n\nln12\r\r\nln14");
            raf.seek(0);

            while ((line=raf.readLine()) != null) {
                if ((ctr == 7) || (ctr == 9) ||
                    (ctr == 11) || (ctr == 13)) {
                     expected = "";
                } else {
                    expected = "ln" + ctr;
                }
                if (!line.equals(expected)) {
                    throw new Exception("Expected \"" + expected + "\"" +
                                        ", read \"" + line + "\"");
                }
                ctr++;
            }
        } finally {
            raf.close();
        }
        System.err.println("Successfully completed test!");
    }

}