HierarchyBoundsListener

The listener interface for receiving ancestor moved and resized events. When the hierarchy to which the Component belongs changes by the resizing or movement of an ancestor, the relevant method in the listener object is invoked, and the HierarchyEvent is passed to it.

void ancestorMoved(HierarchyEvent e)

    Called when an ancestor of the source is moved.

void ancestorResized(HierarchyEvent e)

    Called when an ancestor of the source is resized.

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

class HierarchyBoundsListenerInterfEx implements HierarchyBoundsListener{

 public void ancestorMoved(HierarchyEvent e){
  System.out.println("Hierarchy Added");
 }
 
 public void ancestorResized(HierarchyEvent e){
  System.out.println("Hierarchy Removed");
 }
}

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;

class HierarchyBoundsListenerEx{
 public static void main(String args[])throws Exception{
  JFrame myFrame = new JFrame("Event Handling Example");
  JButton button1 = new JButton("Button 1");
  HierarchyBoundsListenerInterfEx obj1 = new HierarchyBoundsListenerInterfEx();
  int count = 0;
  
  myFrame.setVisible(true);
  myFrame.setSize(250, 250);
  
  String str;
  
  /* Register Focus Lister */
  myFrame.getContentPane().addHierarchyBoundsListener(obj1);
  
  /* Add Buttons to Button */
  myFrame.add(button1);
  
 }
}

Output

Try to resize the window using Mouse, You will get the Output Screen like below.

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