Java/Class/Anonymous class

Access inner class from outside

   <source lang="java">
 

public class Main {

   public static void main(String[] args) {
       Outer outer = new Outer();
       outer.new Inner().hello();
   }

} class Outer {

   public class Inner {
       public void hello(){
         System.out.println("Hello from Inner()");
       }
   }

}

 </source>
   
  
 
  

an example of a simple anonymous class

   <source lang="java">
  

public class MainClass {

 public static void main(String[] args) {
   Ball b = new Ball() {
     public void hit() {
       System.out.println("You hit it!");
     }
   };
   b.hit();
 }
 interface Ball {
   void hit();
 }

}

 </source>
   
  
 
  

Anonymous inner class

   <source lang="java">

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; public class SimpleEvent {

 public static void main(String[] args) {
   JButton close = new JButton("Close");
   close.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent event) {
       System.exit(0);
     }
   });
   JFrame f = new JFrame();
   f.add(close);
   f.setSize(300, 200);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.setVisible(true);
 }

}

 </source>
   
  
 
  

Tick Tock with an Anonymous Class

   <source lang="java">
  

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JOptionPane; import javax.swing.Timer; public class MainClass {

 private String tickMessage = "Tick...";
 private String tockMessage = "Tock...";
 public static void main(String[] args) {
   TickTockAnonymous t = new TickTockAnonymous();
   t.go();
 }
 private void go() {
   Timer t = new Timer(1000, new ActionListener() {
     private boolean tick = true;
     public void actionPerformed(ActionEvent event) {
       if (tick) {
         System.out.println(tickMessage);
       } else {
         System.out.println(tockMessage);
       }
       tick = !tick;
     }
   });
   t.start();
   JOptionPane.showMessageDialog(null, "Click OK to exit program");
   System.exit(0);
 }

}

 </source>