test/java/lang/StringBuffer/InsertNullString.java

/*
 * Copyright 1998 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/* @test
   @bug 4085679
   @summary JLS requires that if you insert a null string, the string
            "null" must be inserted.
   @author Anand Palaniswamy
 */
public class InsertNullString {
    public static void main(String[] args) throws Exception {
        StringBuffer s = new StringBuffer("FOOBAR");

        try {
            String nullstr = null;
            s.insert(3, nullstr); /* this will throw null pointer exception
                                  before the bug was fixed. */
            if (!s.toString().equals("FOOnullBAR")) {
                throw new Exception("StringBuffer.insert() did not insert!");
            }
        } catch (NullPointerException npe) {
            throw new Exception("StringBuffer.insert() of null String reference threw a NullPointerException");
        }
    }
}