FocusListener Örneği JAVA

import java.awt.*; 
import java.awt.event.*; 

public class FocusListenertest extends Frame implements FocusListener 
{ 
Button b1,b2; 

public FocusListenertest() 
{ 
add(b1=new Button ("First"),"South"); 
add(b2=new Button ("Second"),"North"); 
b1.addFocusListener(this); 
b2.addFocusListener(this); 
setSize(200,200); 
//pack(); //Takes minimum size for the window 
} 
public **** focusGained(FocusEvent fe) //method of focuslistener 
{ 
if(fe.getSource()==b1) 
System.out.println(b1.getLabel()+"gained"); 
if(fe.getSource()==b2) 
System.out.println(b2.getLabel()+"gained"); 
if(fe.isTemporary()) 
System.out.println("Temporary Focus"); 
} 
public **** focusLost(FocusEvent fe) //in focusevent "getID()"is a method 
{ 
if(fe.getSource()==b1) 
System.out.println(b1.getLabel()+"lost"); 
if(fe.getSource()==b2) 
System.out.println(b2.getLabel()+"lost"); 
} 
public static **** main(String a[]) 
{ 
new FocusListenertest().setVisible(true); 
} 
}