Classes that are defined inside another class are called inner class or nested class. Inner classes benefits in access control and naming control.

Try out the below code

class Outer

{

String s=”Welcome”;

public void MethodInner()

{

Inner in=new Inner();

in.InnerMethod();

}

class Inner

{

public void InnerMethod()

{

System.out.println(”Hello!”+s);

}

}

}

class RegInnerClass

{

public static void main(String args[])

{

Outer ou=new Outer();

ou.MethodInner();

}

}