Java by API/java.awt.event/FocusEvent

FocusEvent: getOppositeComponent()

   <source lang="java">

import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import javax.swing.JFrame; import javax.swing.JTextField; public class Main {

 public static void main(String[] a) {
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JTextField textField = new JTextField("A TextField");
   textField.addFocusListener(new FocusListener() {
     public void focusGained(FocusEvent e) {
       displayMessage("Focus gained", e);
     }
     public void focusLost(FocusEvent e) {
       displayMessage("Focus lost", e);
     }
     void displayMessage(String prefix, FocusEvent e) {
       System.out.println(prefix
           + (e.isTemporary() ? " (temporary):" : ":")
           + e.getComponent().getClass().getName()
           + "; Opposite component: "
           + (e.getOppositeComponent() != null ? e.getOppositeComponent().getClass().getName()
               : "null"));
     }
   });
   frame.add(textField,"North");
   frame.add(new JTextField(),"South");
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

FocusEvent: isTemporary()

   <source lang="java">

import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import javax.swing.JFrame; import javax.swing.JTextField; public class Main {

 public static void main(String[] a) {
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JTextField textField = new JTextField("A TextField");
   textField.addFocusListener(new FocusListener() {
     public void focusGained(FocusEvent e) {
       displayMessage("Focus gained", e);
     }
     public void focusLost(FocusEvent e) {
       displayMessage("Focus lost", e);
     }
     void displayMessage(String prefix, FocusEvent e) {
       System.out.println(prefix
           + (e.isTemporary() ? " (temporary):" : ":")
           + e.getComponent().getClass().getName()
           + "; Opposite component: "
           + (e.getOppositeComponent() != null ? e.getOppositeComponent().getClass().getName()
               : "null"));
     }
   });
   frame.add(textField,"North");
   frame.add(new JTextField(),"South");
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}

 </source>