01 /*
02 * Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved.
03 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04 *
05 * This code is free software; you can redistribute it and/or modify it
06 * under the terms of the GNU General Public License version 2 only, as
07 * published by the Free Software Foundation. Sun designates this
08 * particular file as subject to the "Classpath" exception as provided
09 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.awt;
27
28 /**
29 * Thrown when code that is dependent on a keyboard, display, or mouse
30 * is called in an environment that does not support a keyboard, display,
31 * or mouse.
32 *
33 * @since 1.4
34 * @author Michael Martak
35 */
36 public class HeadlessException extends UnsupportedOperationException {
37 /*
38 * JDK 1.4 serialVersionUID
39 */
40 private static final long serialVersionUID = 167183644944358563L;
41
42 public HeadlessException() {
43 }
44
45 public HeadlessException(String msg) {
46 super (msg);
47 }
48
49 public String getMessage() {
50 String super Message = super .getMessage();
51 String headlessMessage = GraphicsEnvironment
52 .getHeadlessMessage();
53
54 if (superMessage == null) {
55 return headlessMessage;
56 } else if (headlessMessage == null) {
57 return superMessage;
58 } else {
59 return superMessage + headlessMessage;
60 }
61 }
62 }
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