Swing component

Popup

package Swing;

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

import static javax.swing.WindowConstants.EXIT_ON_CLOSE;

public class Dialog01 extends JFrame {
    
    public static void main(String[] args) {
    
new Dialog01();
    }

    public Dialog01() {
    
        this.setVisible(true);
        this.setBounds(100, 100, 200, 200);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        Container container = this.getContentPane();
        // Absolute layout 
        container.setLayout(null);


        // Button 
        JButton button = new JButton(" Click to pop up a dialog box ");// establish 
        button.setBounds(100, 100, 500, 500);

        // A pop-up window pops up when you click the button 
        button.addActionListener(new ActionListener() {
    // Monitor 
            @Override
            public void actionPerformed(ActionEvent e) {
    

                new MyDialog();
            }
        });

        container.add(button);
    }
}
    // Pop up window 
    class MyDialog extends JDialog{
    
        public MyDialog() {
    

            this.setBounds(100,100,100,100);
           // this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

            Container container =new Container();
            container.setLayout(null);
            container.add(new Label(" Tomorrow's scenery is more beautiful "));
            this.add(container);

            this.setVisible(true);
        }
    }