Button Action Listner in java

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

public class ButtonActionSample implements ActionListener{

 JButton button;
  public ButtonActionSample()
  {
   
    JFrame frame = new JFrame("Button Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();
   
    button = new JButton("Select Me");
    button.addActionListener(this);
       
    contentPane.add(button, BorderLayout.SOUTH);
    frame.setSize(300, 100);
    frame.setVisible(true);
  }
    public void actionPerformed(ActionEvent ae) {
        if(ae.getSource()==button)
        {
        JOptionPane.showMessageDialog(null,"Hello this Button");
        }
      }
     
  public static void main(String args[]) {
 
    ButtonActionSample bas = new ButtonActionSample();
  }
  }

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