/*
* Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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package java.util;
/**
* <p>
* The root class from which all event state objects shall be derived.
* <p>
* All Events are constructed with a reference to the object, the "source",
* that is logically deemed to be the object upon which the Event in question
* initially occurred upon.
*
* @since JDK1.1
*/
public class
EventObject implements java.io.
Serializable {
private static final long
serialVersionUID = 5516075349620653480L;
/**
* The object on which the Event initially occurred.
*/
protected transient
Object source;
/**
* Constructs a prototypical Event.
*
* @param source The object on which the Event initially occurred.
* @exception IllegalArgumentException if source is null.
*/
public
EventObject(
Object source) {
if (
source == null)
throw new
IllegalArgumentException("null source");
this.
source =
source;
}
/**
* The object on which the Event initially occurred.
*
* @return The object on which the Event initially occurred.
*/
public
Object getSource() {
return
source;
}
/**
* Returns a String representation of this EventObject.
*
* @return A a String representation of this EventObject.
*/
public
String toString() {
return
getClass().
getName() + "[source=" +
source + "]";
}
}