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);
   }
}