OOP

Question 1

Polymorphism

Answer 1

Having multiple forms. An object could have multiple forms. Compile time polymorphism is method overloading. Runtime version is done via inheritance and interfaces.

Question 2

Method overloading and method overriding

Answer 2

Overloading: create a method of the same name, but different return values
Overriding: Create your own implementation of an existing method

Question 3

Can you override a private or static method in Java

Answer 3

No.

Question 4

Features of OOP

Answer 4

Encapsulation, Polymorphism, Ineheritance
Abstraction
Composition
Association
Aggregation

Question 5

Explain Encapsulation

Answer 5

Restricting data access of variables in an object. Restricting methods to an object

Question 6

Explain abstraction

Answer 6

Concept of oops to construct an object related to the real world. Only general states and behaviors are defined. More specifics are left to be defined by the implementers

Question 7

What is a class

Answer 7

Template of an object

Question 8

What is an object

Answer 8

An instance of a classin

Question 9

Static binding

Answer 9

Also called early binding. Resolving an association at compile time. Example method overloading

Question 10

Dynamic binding

Answer 10

Also called late/virtual binding. Resolving an association at run time.

Question 11

Override vs Overload

Answer 11

Override: same function name different signature. This is done by creating a method of the same name. But different parameters. This is compile time polymorphism.

Overload: same function name AND signature. Usually used when you want to extend/reuse functionality. This is known as run time polymorphism.