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30 * The root class from which all event state objects shall be derived.
32 * All Events are constructed with a reference to the object, the "source",
33 * that is logically deemed to be the object upon which the Event in question
34 * initially occurred upon.
39 public class EventObject implements java.io.Serializable {
41 private static final long serialVersionUID = 5516075349620653480L;
44 * The object on which the Event initially occurred.
46 protected transient Object source;
49 * Constructs a prototypical Event.
51 * @param source The object on which the Event initially occurred.
52 * @exception IllegalArgumentException if source is null.
54 public EventObject(Object source) {
56 throw new IllegalArgumentException("null source");
62 * The object on which the Event initially occurred.
64 * @return The object on which the Event initially occurred.
66 public Object getSource() {
71 * Returns a String representation of this EventObject.
73 * @return A a String representation of this EventObject.
75 public String toString() {
76 return getClass().getName() + "[source=" + source + "]";