Annonymous Inner Classes In Java

A class that have no name is called anonymous inner class;

They can be created by using:
1. class
2. abstract class
3. interfaces

Example 1:
lets consider a abstract class

package abstractconcept;
public abstract class MyAbstract
{
   public String name;
   public int age;
 
   /**Abstract Method*/
   public abstract int sum(int a,int b);
 
   /**
    * Concrete Method
    */
   public int sub(int c,int d)
   {
       return c-d;
   }
}



Implementing Class
package abstractconcept;

public class Annonymous
{
  public static void main(String[] args)
  {
   
      MyAbstract obj=new MyAbstract() {
       
        @Override
        public int sum(int a, int b) {
            // TODO Auto-generated method stub
            return a+b;
        }
    };
     System.out.println(obj.sum(10,10));
  }
 
}

Output: 20

Code of Anonymous Class:Generated by the compiler at compile time

import java.io.PrintStream.*;
public class Annonymous$1 extends MyAbstract  
{ 
   Annonymous$1(){} //Default Constructor
   public int sum(int a, int b) 
   {
        return a+b;
   }

}

Example 2:
Anonymous inner class using interface

package abstractconcept; 
interface MyAbstract
{ 
   /**Abstract Method*/
   public abstract int sum(int a,int b);
}



Implementing Class
package abstractconcept;

public class Annonymous implements MyAbstract
{
  public static void main(String[] args)
  {
   
      MyAbstract obj=new MyAbstract() {
       
        @Override
        public int sum(int a, int b) {
            // TODO Auto-generated method stub
            return a+b;
        }
    };
     System.out.println(obj.sum(10,10));
  }
 
}

Output: 20

Code of Anonymous Class:Generated by the compiler at compile time

import java.io.PrintStream.*;
public class Annonymous$1 extends MyAbstract  
{ 
   Annonymous$1(){} //Default Constructor
   public int sum(int a, int b) 
   {
        return a+b;
   }

}