Object Oriented Language

Question 1

What is the terminology required?

Answer 1

Objects, classes, polymorphism, encapsulation and inheritance

Question 2

Describe an object

Answer 2

A logical unit that contains both properties and methods that manipulate it. Methods normally take the form of functions and procedures and allow messages in to and out from the object.

Question 3

Describe a class

Answer 3

A class is the design of an object A class can be used to create an object - an instance of a class. multiple instances can be created from the same class the values of the properties may differ but the methods will stay the same.

Question 4

Describe inheritance

Answer 4

sub-classes can be derived from existing classes. The new classes will have all the existing properties of existing classes.

Question 5

Describe encapsulation

Answer 5

sub-classes can be derived from existing classes. The new classes will have all the existing properties of existing classes.

Question 6

Describe polymorphism

Answer 6

Where sub-classes can respond differently to identical messages from the super class. The same syntax but different semantics.

Question 7

How to instantiate an object

Answer 7

Dim objectName = New className(value1, value2, value3)

Question 8

How to declare an array of objects

Answer 8

Dim arrayName(arrayLength) As className

Question 9

Arrays terminology

Answer 9

Inherits, overrides, the procedure call invokes the - method, no overriding method, method used to get the value (don’t access directly)