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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:
IllegalArgumentException – if source is null/**
     * 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 + "]";
    }
}