2: Chapter 8

Question 1

Object-oriented programming

Answer 1

Reasoning about a program as a set of objects rather than as a set of action.

Question 2

Object

Answer 2

A programming entity that contains state (data) and behavior (methods).

Question 3

State

Answer 3

A set of values (internal data) stored in an object.

Question 4

Behavior

Answer 4

A set of actions an object can perform, often reporting or modifying its internal state.

Question 5

Client (or client code)

Answer 5

Code that interacts with a class or objects of that class.

Question 6

Field

Answer 6

A variable inside an object that makes ip part of its internal state.

Question 7

Instance method

Answer 7

A method inside an object that operates on that object.

Question 8

Implicit parameter

Answer 8

The object that is referenced during an instance method call.

Question 9

Mutator

Answer 9

An instance method that modifies the object’s internal state.

Question 10

Accessor

Answer 10

An instance method that provides information about the state of an object without modifying it.

Question 11

this

Answer 11

A Java keyword that allows you to refer to the implicit parameter inside a class.

Question 12

Encapsulation

Answer 12

Hiding the implementation details of an object from the clients of the object.

Question 13

Abstraction

Answer 13

Focusing on essential properties rather than inner details.

Question 14

Class invariant

Answer 14

An assertion about an object’s state that is true for the lifetime of that object.

A description of something that must always be true of any instances of the class.

Question 15

Cohesion

Answer 15

The extent to which the code for a class represents a single abstraction.