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

public class DetectSourceDemo extends JFrame {
  // Create four buttons
  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 DetectSourceDemo() {
    // Create a panel to hold buttons
    JPanel panel = new JPanel();
    panel.add(jbtNew);
    panel.add(jbtOpen);
    panel.add(jbtSave);
    panel.add(jbtPrint);
    
    add(panel);

    // Create a listener 
    ButtonListener listener = new ButtonListener(); 

    // Register listener with buttons 
    jbtNew.addActionListener(listener);
    jbtOpen.addActionListener(listener);
    jbtSave.addActionListener(listener);
    jbtPrint.addActionListener(listener);
  }

  class ButtonListener implements ActionListener {
    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");
    }
  }

  /** Main method */
  public static void main(String[] args) {
    JFrame frame = new DetectSourceDemo();
    frame.setTitle("DetectSourceDemo");
    frame.setLocationRelativeTo(null); // Center the frame
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
  }
}