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package java.util;

The root class from which all event state objects shall be derived.

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:1.1
/** * <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 1.1 */
public class EventObject implements java.io.Serializable { @java.io.Serial private static final long serialVersionUID = 5516075349620653480L;
The object on which the Event initially occurred.
/** * The object on which the Event initially occurred. */
protected transient Object source;
Constructs a prototypical Event.
Params:
  • source – the object on which the Event initially occurred
Throws:
/** * Constructs a prototypical Event. * * @param source the object on which the Event initially occurred * @throws 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.
Returns:the object on which the Event initially occurred
/** * 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.
Returns:a String representation of this EventObject
/** * Returns a String representation of this EventObject. * * @return a String representation of this EventObject */
public String toString() { return getClass().getName() + "[source=" + source + "]"; } }