code: public class ListenerTest {
     public static void main(String[] args) {
       JButton testButton = new JButton("Test Button");
       testButton.addActionListener(new ActionListener(){
       @Override public void actionPerformed(ActionEvent ae){
           System.out.println("Click Detected by Anon Class");
         }
       });
  
       testButton.addActionListener(e -> System.out.println("Click Detected by Lambda Listner"));
  
       // Swing stuff
       JFrame frame = new JFrame("Listener Test");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.add(testButton, BorderLayout.CENTER);
       frame.pack();
       frame.setVisible(true);
     }
  }
  