FrameAsListenerDemo

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

public class FrameAsListenerDemo extends JFrame
    implements ActionListener {
    private JButton jbtNew = new JButton("New");
    private JButton jbtOpen = new JButton("Open");
    private JButton jbtSave = new JButton("Save");
    private JButton jbtPrint = new JButton("Print");
   
    public FrameAsListenerDemo() {
        JPanel panel = new JPanel();
        panel.add(jbtNew);
        panel.add(jbtOpen);
        panel.add(jbtSave);
        panel.add(jbtPrint);
       
        add(panel);
       
        jbtNew.addActionListener(this);
        jbtOpen.addActionListener(this);
        jbtSave.addActionListener(this);
        jbtPrint.addActionListener(this);
    }
   
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == jbtNew)
            System.out.println("Process New");
        else if(e.getSource() == jbtOpen)
            System.out.println("Process Open");
        else if(e.getSource() == jbtSave)
            System.out.println("Process Save");
        else if(e.getSource() == jbtPrint)
            System.out.println("Process Print");
        System.out.println(e.getSource());
    }
   
    public static void main(String[] args) {
        FrameAsListenerDemo frame = new FrameAsListenerDemo();
        frame.setTitle("FrameAsListener");
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.pack();
    }
}