Inner Class Concept in Java

Using this concept we will create class inside class ,It is also called Nested Class:-
1 Dynamic Inner class:-
   It Contain Dynamic data member and member function.
  class A
 {
       class B
       {

      }
}
Example of Inner Class:-
class A
{
    class B
    {
         public void fun1()
         {
             System.out.println("B");
         }
    }
  public void fun()
         {
             System.out.println("A");
         }

public static void main(String args[])
{
     A obj = new A();
     obj.fun();
     obj.new B().fun1();
}
}
2 Static Inner Class:-
     It Contain Static Data member and member function.
   class A
 {
       static class B
       {

      }
}

Example of Static Inner Class in Java:-
class A
{
   static class B
    {
         public static void fun1()
         {
             System.out.println("B");
         }
    }
  public void fun()
         {
             System.out.println("A");
         }

public static void main(String args[])
{
     A obj = new A();
     obj.fun();
     A.B.fun1();
}
}Anonymous class in Java:-

If we want to define the functionality of Interface and abstract class under any method block instantly then we can create an anonymous class.

Example of it's:

abstract class An

{

   public abstract void fun();

}

interface In

{

    void fun1();

}

class Bn 

{

   public static void main(String args[])

   {

      An obj=  new An(){

             public void fun()

                 {

                         System.out.println("Bn");

                }

            };

      In o = new In()

      {

                public void fun1()

                 { 

                         System.out.println("In");

                }

      };

      obj.fun();

      o.fun1();

   }

}