Java by API/java.awt.event/FocusAdapter

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extends FocusAdapter

   <source lang="java">

import java.awt.event.FocusAdapter; import java.awt.event.FocusEvent; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JButton component = new JButton("a");
   component.addFocusListener(new MyFocusListener());
   
   JFrame f = new JFrame();
   f.add(component);
   f.pack();
   f.setVisible(true);
   
   
 }

} class MyFocusListener extends FocusAdapter {

 public void focusGained(FocusEvent evt) {
   System.out.println("gained the focus.");
 }
 public void focusLost(FocusEvent evt) {
   System.out.println("lost the focus.");
   boolean isTemporary = evt.isTemporary();
 }

}

 </source>