https://openjdk.java.net/ 
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package java.beans;


A "PropertyChange" event gets fired whenever a bean changes a "bound"
property.  You can register a PropertyChangeListener with a source
bean so as to be notified of any bound property updates.

Since:1.1
/**
 * A "PropertyChange" event gets fired whenever a bean changes a "bound"
 * property.  You can register a PropertyChangeListener with a source
 * bean so as to be notified of any bound property updates.
 * @since 1.1
 */

public interface PropertyChangeListener extends java.util.EventListener {

    
This method gets called when a bound property is changed.

Params:
  • evt – A PropertyChangeEvent object describing the event source
         and the property that has changed.
/**
     * This method gets called when a bound property is changed.
     * @param evt A PropertyChangeEvent object describing the event source
     *          and the property that has changed.
     */

    void propertyChange(PropertyChangeEvent evt);

}