Object Oriented Programming

Question 1

Selection

Answer 1

Conditional Statements (“if” statements)

Question 2

Choices

Answer 2

When “if” statements hs “else” it becomes a choice

Question 3

Iteration

Answer 3

Doing something more than once (using “for”, “do”, “while)

Question 4

Structured Code

Answer 4

Any combination of sequence, selection, and iteration

Question 5

Procedural Code

Answer 5

Procedures address a problem with structured code

Question 6

Problems with Global Variables

Answer 6

Is it safe to use?

Where did the values come from?

Question 7

Subroutines

Answer 7

Reducing duplication of code within a program

Question 8

Global Variables

Answer 8

a variable type that is declared outside any function and is accessible to all functions throughout the program

Question 9

Object-Oriented Programming

Answer 9

Model the world as objects.

Objects can send “messages” to each other.

Question 10

Static Fields

Answer 10

A static field belongs to the class
Do not change from one instance to the other

Question 11

Static Methods

Answer 11

Do not need to create an object of the class in order to
call the method. Can be called through the class name
"Classname.staticmethod();"
or "staticmethod()" if in the same class
Can not be overridden
Can only call other static methods
Only access static fields

Question 12

Class

Answer 12

Group of objects with similar attributes or behaviour

Question 13

Final Class

Answer 13

A final class cannot be subclassed

Question 14

Final Methods

Answer 14

A final method cannot be overridden or hidden by subclasses

Question 15

Final Variable

Answer 15

Can only be initialised once

Question 16

Association

Answer 16

Represents a general relationship that describes an activity between two classes

“uses”

if class A uses class B, then one ore more methods of class B will be invoked by class A (from one or more methods in class A).

Question 17

Aggregation

Answer 17

Aggregation is a special type of association. That is, a class that is defined in part by another class is dependent on that class.

“has a” relationship or “made of”

Question 18

Composition

Answer 18

An aggregation relationship that implies a child cannot exist independent of the parent.

Question 19

Inheritance

Answer 19

“is an extension of” relationship.

Manager and secretary are extensions of employee

Question 20

Inheritance vs Aggregation

Answer 20

A dog is an animal (inheritance) (is a)

A person cannot exist without a name (aggregation) (has a)

Question 21

Polymorphism

Answer 21

The ability of an object to take on many forms. Often seen with a parent/child relationship between classes.

Question 22

Method Overloading

Answer 22

a feature that allows a class to have more than one method having the same name, if their argument lists are different.