KeyboardFocusManager.addPropertyChangeListener(PropertyChangeListener listener) has the following syntax.
public void addPropertyChangeListener(PropertyChangeListener listener)
In the following code shows how to use KeyboardFocusManager.addPropertyChangeListener(PropertyChangeListener listener) method.
import java.awt.Component; import java.awt.KeyboardFocusManager; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; //w ww . ja v a2s .co m public class Main { public static void main(String[] argv) { KeyboardFocusManager.getCurrentKeyboardFocusManager().addPropertyChangeListener( new FocusChangeListener()); } } class FocusChangeListener implements PropertyChangeListener { public void propertyChange(PropertyChangeEvent evt) { Component oldComp = (Component) evt.getOldValue(); Component newComp = (Component) evt.getNewValue(); if ("focusOwner".equals(evt.getPropertyName())) { if (oldComp == null) { System.out.println(newComp.getName()); } else { System.out.println(oldComp.getName()); } } else if ("focusedWindow".equals(evt.getPropertyName())) { if (oldComp == null) { System.out.println(newComp.getName()); } else { System.out.println(oldComp.getName()); } } } }