/*
 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package java.awt;

/**
 * Thrown when code that is dependent on a keyboard, display, or mouse
 * is called in an environment that does not support a keyboard, display,
 * or mouse.
 *
 * @since 1.4
 * @author Michael Martak
 */
public class HeadlessException extends UnsupportedOperationException {
 /*
 * JDK 1.4 serialVersionUID
 */
 private static final long serialVersionUID = 167183644944358563L;
 public HeadlessException() {}
 public HeadlessException(String msg) {
 super(msg);
 }
 public String getMessage() {
 String superMessage = super.getMessage();
 String headlessMessage = GraphicsEnvironment.getHeadlessMessage();

 if (superMessage == null) {
 return headlessMessage;
 } else if (headlessMessage == null) {
 return superMessage;
 } else {
 return superMessage + headlessMessage;
 }
 }
}