1 /*
2  * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 /*
25  * @test
26  * @bug 4286765
27  * @summary HashMap and TreeMap entrySet().remove(k) spuriously returned
28  *          false if the Map previously mapped k to null.
29  */
30 package test.java.util.HashMap;
31 
32 import java.util.HashMap;
33 import java.util.Map;
34 import java.util.TreeMap;
35 
36 public class KeySetRemove {
main(String[] args)37     public static void main(String[] args) throws Exception {
38         Map[] m = {new HashMap(), new TreeMap()};
39         for (int i=0; i<m.length; i++) {
40             m[i].put("bananas", null);
41             if (!m[i].keySet().remove("bananas"))
42                 throw new Exception("Yes, we have no bananas: "+i);
43         }
44     }
45 }
46