extends FocusAdapter : FocusAdapter « java.awt.event « Java by API

1. Java by API
2. java.awt.event
3. FocusAdapter

extends FocusAdapter

 


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();
  }
}

   
  

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