package testwindow;

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

public class TestFrames extends JFrame{
  static TestFrames t1;

  public TestFrames() {
    JButton b = new JButton("Click Here");
    b.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e)
        {
          JFrame f = new JFrame("child window");
          //f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          f.addWindowListener(new WindowAdapter() {
              public void windowClosing(WindowEvent e) {
                  t1.setEnabled(true);
              }
          });

          f.setVisible(true);
          t1.setEnabled(false);
        }
    });

    getContentPane().add(b);
  }
  public static void main(String[] args) {
    t1 = new TestFrames();
    t1.setSize(300,300);
    t1.setVisible(true);

  }

}