method overloading 1. return type should be same 2. can't create two functions with same parameters in class class A f void add (int a, int b); void add (int a, string b, int c); A obj =new A(); access modifier 1.public ( access in all area) 2. private (only access in class) final keyword-avoid inheritance encapsulation In class method and variables in a single unit note; 1. declare the class variables in private 2. declare the class methods in public example private int a; public set (int a) this a=a