Object Oriented Terminology

Question 1

What is a Class?

Answer 1

The blueprint to create an object

Question 2

What is an object?

Answer 2

An instance of a class

Question 3

What is encapsulation?

Answer 3

Assigning levels of access to variables, methods and classes

Question 4

What is the benefit of inheritance?

Answer 4

Gives the program robustness for reuse / future use

Question 5

What is inheritance?

Answer 5

• Derives new classes from existing classes
• Subclass retains specific attributes and methods from the superclass

Question 6

What are the 4 different access levels provided by encapsulation?

Answer 6

• Public can be used by any class from any package
• Private can only be used by the current class
• Protected can only be used via inheritance from the current class
• Package-wide (Default) allows all classes inside the current package to access

Question 7

What is meant by the Static components of a class?

Answer 7

• Variables and methods from the class
• When called by an object, these static components are run from the class, not the object

Question 8

What is meant by the non-static components of a class?

Answer 8

• Non static components are copied into the objects when instantiated
• These are called from the objects when run

Question 9

What is the purpose of a “getter” or “accessor” method?

Answer 9

To return the value of an attribute in a private class