Initial data commit

Task/Higher-order-functions/Java/higher-order-functions-2.java

@@ -0,0 +1,19 @@
+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);
+   }
+}