Anonymous Inne Classes - Java

Anonymous inner classes are little confusing in java. Remember one thing about these classes that, anonymous inner classes can either implement one interface or extend one class at a time only. These classes can never extend and implement class and interface but only one at a time.

Here I am presenting few things about anonymous inner classes with examples.

Anonymous inner class extending class :

Here is a code where anonymous class is sub class of one of super class,

Code :

class Test {

     public void cool() {

          System.out.print("This is original.");

     }

}

class Main {

     public static void main(String args[]) {

          Test t = new Test() {

               public void cool() {

                    System.out.print("This is duplicate.");

               }

          };

          t.cool();

     }

}

This code will output "This is duplicate.". In this way we can use anonymous inner classes for overriding one or more methods of super class.

Anonymous inner class implementing interface :

Here is code presenting this concept,

Code :

interface Test {

     public void ohh();

}

class Main {

     public static void main(String args[]) {

          Test t = new Test() {

               public void ohh() {

                    System.out.print("Hahahaha");

               }

          };

          t.ohh();
     }

} 

This code will print "Hahahaha". Here anonymous inner class is implementing our Test interface.

Anonymous inner class as argument :

Here is code for this one,

Code :

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button.addActionListener(new ActionListener() {

     public void actionPerformed(ActionEent ae) {

     }

});

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Enjoy it.....