test/java/io/Reader/SkipNegative.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.
 *
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 * questions.
 */

/* @test
   @bug 4150442
   @summary Skip must throw an exception for negative args
*/



import java.io.*;

public class SkipNegative {
    public static void main(String argv[]) throws Exception {
        File f = new File(System.getProperty("test.src", "."),
                          "SkipInput.txt");
        FileReader fr = new FileReader(f);
        long nchars = -1L;
        try {
            long actual = fr.skip(nchars);
        } catch(IllegalArgumentException e){
            // Negative argument caught
            return;
        }
        throw new Exception("Skip should not accept negative values");
    }
}