object oreinted p[roggreamoing

Question 1

What is a class

Answer 1

a template for an object it includes attributes

Question 2

what is an object

Answer 2

an instance of a class. objects have attributes

Question 3

what is a method

Answer 3

a method is a function or procedure that gives functionality to an object. methods have attributes

Question 4

what is a constructor

Answer 4

a method that runs when the object is first instated, giving attributes an initial value.

Question 5

what is the difference between a record and a class

Answer 5

Records can only access attributes directly, whereas classes can only access attributes through a method.

re use or a records code is tricky
re use of a classes code is easy

Question 6

what is an attribute

Answer 6

a data structure that holds a value for each object (like a variable)

Question 7

inheritance

Answer 7

when a sub-class takes on the attributes and methods of a superclass

Question 8

Encapsulation

Answer 8

all attributes are private they are only accessible through methods. this makes the code more robust

Question 9

polymorphism

Answer 9

occurs when a super class and a subclass both have methods with the same identifier. the sub class overrides the superclass method because of polymorphism

Question 10

What is abstraction? What are the pros?

Answer 10

(Is when we hide unnecessary detail from a problem.)
The simplification of a problem, for example objects might show up as simple shapes

+Easier to /understand
+Might use less memory
+Reality creates many unneeded details
+Reduces complexity of program code and therefore can run on lower spec computers

Question 11

Overloading (in polymorphism )

Answer 11

When two or more methods have the same identifier name (within the same class) then the correct method is used depending on the number of parameters