test/jdk/java/io/PrintWriter/SubClass.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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 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/* @test
   @bug 4103356 4121985
   @summary Test new subclassing features of PrintWriter
 */

import java.io.*;


public class SubClass {


    static class PW extends PrintWriter {

        PW(Writer out) {
            super(out);
        }

        public void println() {
            try {
                out.write("[EOL]");
            } catch (IOException x) {
                setError();
            }
            super.println();
        }

    }


    public static void main(String[] args) throws Exception {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PW(sw);
        pw.println("Hello");
        pw.close();
        String s = sw.toString();
        System.err.print(s);
        if (!s.equals("Hello[EOL]" + System.getProperty("line.separator")))
            throw new Exception("Subclass broken");
    }

}