test/jdk/java/io/LineNumberReader/Read.java

/*
 * Copyright (c) 1998, 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 4074875 4063511
   @summary Make sure LineNumberReader.read(char, int , int) will increase
            the linenumber correctly.
   */

import java.io.*;

public class Read {

    public static void main(String[] args) throws Exception {
        String s = "aaaa\nbbb\n";
        char[] buf = new char[5];
        int n = 0;
        int line = 0;

        LineNumberReader r = new LineNumberReader(new StringReader(s));

        do {
            n = r.read(buf, 0, buf.length);
        } while (n > 0);

        line = r.getLineNumber();

        if (line != 2)
            throw new Exception("Failed test: Expected line number: 2, got "
                                + line);
    }
}