Java tutorial
import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; import java.io.Serializable; public class Main { public static void main(String[] argv) throws Exception { MyBean bean = new MyBean(); bean.setName("A"); bean.setName("B"); bean.setName("C"); } } class MyBean implements PropertyChangeListener, Serializable { private Long id; private String name; private PropertyChangeSupport pcs = new PropertyChangeSupport(this); public MyBean() { pcs.addPropertyChangeListener(this); } public void propertyChange(PropertyChangeEvent evt) { System.out.println("Name = " + evt.getPropertyName()); System.out.println("Old Value = " + evt.getOldValue()); System.out.println("New Value = " + evt.getNewValue()); } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { String oldValue = this.name; this.name = name; pcs.firePropertyChange("name", oldValue, name); } }