Abstract - Day 6

Question 1

Abstract

Answer 1

An incomplete method and requires a child class to complete it.

Child class MUST implement the abstract methods.

Question 2

Coding with abstract

Answer 2

Abstract class encapsulates the common behaviour of its children classes through abstract methods

Non abstract classes that extends an abstract class must implement abstract methods

If it contains abstract method then class is abstract

Class can be abstract without any method

Question 3

Abstract classes enforce_____ and abstract methods enforce ______

Answer 3

Inheritance and overriding

Parent reference and child object both refer to an abstract class will always be of the child class

> > “abstract”

Question 4

Why abstract?

Answer 4

TO INDUCT INHERITANCE

Question 5

Instanceof operator

Answer 5

Tests whether a reference variable is an instance of the specified type (class, subclass or interface)