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       In java Accessing a variable , method, or any  other data member of a class is 

possible by using object or reference. And the data members of any reference or object 

can be differentiate. And this differentiation can be divided into two types they are:

          1)      This Keyword.

          2)      Super Keyword.

This Keyword:

    This is one of the implicit variable / keyword/object created by jvm supplied to each and every java program for two purposes.

They are

a)      It points to current class object.

b)      Whenever the formal parameters and data members of the class are similar, jvm gets an ambiguity. In order to differ between formal parameters and data members of the class must be preceded by keyword “this”.

this keyword is playing an important role in three places they are

 1) this At variable level

 2) this At Method level

 3) this At Constructor level(this at constructor  is one of the calling constructor process)

For Example:

               Class  demo

             {

                int a,b;

                Demo(int a,int b)

              {

                this.a=a; //Here it to differ the formal and data members

                this.b=b; //Here it to differ the formal and data members

              }

            }

  Super keyword:

         Super is one of the keyword in java. Whenever we inherit base class details into 

derived class, there is possibility that base class features are similar to derived class 

features and jvm gets an ambiguity. By using Super keyword to differentiate between 

based class features and derived class features, in context of derived class the base 

class features must be preceded by super keyword

 

     Syntax:

                 Super.baseclassfeature;

        If we are not writing super keyword before the base class features are hidden in the context of derived  class. Hence super is keyword which differ the base and derived class features.

      

      Similarly,Super keyword is playing an important role in three places they are

1)     Super  At variable level

2)     Super At method level

3)     Super At constructor level (Super at constructor  is one of the calling constructor process)