Advanced Classes & Objects

Question 1

What is method overloading?

Answer 1

Method overloading occurs when multiple methods in the same class have the same name but different parameter lists. (number or type)

Question 2

What is method overriding?

Answer 2

Method overriding occurs when a subclass provides a specific implementation of a method that is already defined in its super class.

Question 3

What is the ‘super’ keyword used for?

Answer 3

It refers to the super class of the current object. It can be used to call the superclass constructor, or to access superclass methods or fields.

Question 4

What is encapsulation?

Answer 4

Encapsulation is the concept of hiding the internal details of an object and exposing only necessary functionality. (Uses private & public)

Question 5

What is the difference between ‘private’, ‘protected’, and ‘public’ access modifiers?

Answer 5

private: accessible only within the same class.
protected: accessible within the same package or by subclasses.
public: accessible from any class.