It is quite natural to prepare for tough questions even if you do not expect it. Being prepared for tough and important questions gives you a sense of confidence and helps you answer your interview questions with ease. On the contrary, if you come unprepared, then the interview might make you feel nervous and make you tense up on answers you already know. In fact, the definition of a tough question is not established. What may be tough to me, may not essentially appear to be as challenging to you. Hence, you can prepare a list of important questions which you feel is tough for the interview to carry on with ease. 

Mentioned below are some tough questions that most students find challenging:

 Define Local variable and Instance variable?

Ans: Local variables is the method and scope of the variables that have existed inside the method itself.

An instance variable is used to explain inside the class but outside the method and scope of variables that exist throughout the class.

What is Polymorphism?

Ans: Polymorphism means many forms.

A single object can refer to the superclass or subclass depending on the reference type which is called polymorphism.

What is meant by Method Overriding?

Ans: Method overriding happens if the subclass method satisfies the below conditions with the Superclass method:

• Method name should be the same

• The argument should be the same

• Return type also should be the same

The key benefit of overriding is that the Subclass can provide some specific information about that subclass type than the superclass.

What is meant by Overloading?

Ans: Method overloading happens for different classes or within the same class.

For method overloading, the subclass method should satisfy the below conditions with the Superclass method (or) methods in the same class itself:

• Same method name

• Different argument type

• May have different return types