Hoofdstuk 10

Question 1

What is data-abstraction?

Answer 1

Values can be combined into one, and form a new, more abstract type with proper operations

Question 2

What is good about data-abstraction?

Answer 2

Easily handle more complex structures
Don’t need to care about the details
Separation of INTERFACE and IMPLEMENTATION
Information Hiding: data inside can only be accessible via defined interface

Question 3

What is representation Independence?

Answer 3

2 correct implementations of a single specification of an ADT are indistinguishable by clients of these types

Question 4

What are limits of ADT?

Answer 4

ADT’s are good for encapsulation and information hiding, however they are not flexible enough to be used in more complex design.
We need four requirements of OOP
-Encapsulation and Information Hiding
-Inheritance
-Subtype compatibility
-Dynamic method selection

Question 5

What is an object?

Answer 5

Container which encapsulates both data and operations

Question 6

What are data items in an object called?
What are operations called?

Answer 6

Instance variables
Methods