Java by API/java.awt.event/ComponentListener

implements ComponentListener

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ruponentEvent; import java.awt.event.ruponentListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JSplitPane; public class Main {

 public static void main(String args[]) {
   JFrame frame = new JFrame();
   Container contentPane = frame.getContentPane();
   ComponentListener comp = new ComponentListener() {
     public void componentHidden(ComponentEvent e) {
       dump("Hidden", e);
     }
     public void componentMoved(ComponentEvent e) {
       dump("Moved", e);
     }
     public void componentResized(ComponentEvent e) {
       dump("Resized", e);
     }
     public void componentShown(ComponentEvent e) {
       dump("Shown", e);
     }
     private void dump(String type, ComponentEvent e) {
       System.out.println(e.getComponent().getName() + " : " + type);
     }
   };
   JButton left = new JButton("Left");
   left.setName("Left");
   left.addComponentListener(comp);
   final JButton right = new JButton("Right");
   right.setName("Right");
   right.addComponentListener(comp);
   ActionListener action = new ActionListener() {
     public void actionPerformed(ActionEvent e) {
       right.setVisible(!right.isVisible());
     }
   };
   left.addActionListener(action);
   JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, true,
       left, right);
   contentPane.add(pane, BorderLayout.CENTER);
   frame.setSize(300, 200);
   frame.show();
 }

}

 </source>