Chapter 4

Question 1

State

Answer 1

what does the object know?

Question 2

behaviors

Answer 2

what does it do?

Question 3

Methods define

Answer 3

behaviors

Question 4

class

Answer 4

blueprint of an object

ex: s.toUppercase();

Question 5

string class is provided, but we can

Answer 5

make our own classes

Question 6

constructor method instantiates

Answer 6

an object
EX: new Scanner(System.in)

Question 7

face variable in the Coin class

Answer 7

is called instance data or instance variable

Question 8

___ variables point directly at its values in memory

Answer 8

primitive

ex: int, double, boolean

Question 9

____ variables point to the object’s address

Answer 9

reference variables

ex: string

Question 10

abstraction

Answer 10

can use object without knowing how they work

Question 11

Encapsulation

Answer 11

seperates external from internal,

the plastic of the black box

Question 12

Encapsulation internal

Answer 12

variables object holds and the methods that make the object useful

Question 13

Encapsulation external

Answer 13

the service that an object provides and how it interacts

Question 14

Self governing

Answer 14

change to and object’s state should be made through the methods

Question 15

Two visibilty modifiers

Answer 15

public and private

Question 16

public visibility

Answer 16

class interface, methods

Question 17

private visibility

Answer 17

Internal to the object, private

Question 18

private variables

Answer 18

getters/accessors, and setters/mutators

Question 19

Code for getter/setter

Answer 19

get()/set()

Question 20

Driver program

Answer 20

controls and tests other parts of the program

Question 21

Method

Answer 21

runs programs when the method is called

Question 22

Method changes flow of control by

Answer 22

making it jump to the code within the method and then jumping back

Question 23

method header blueprint

Answer 23

visibility return-type method-name(parameter list)

{method body}

Question 24

scope

Answer 24

area in which a variable is defined and can be used

Question 25

return type

Answer 25

returns a type, void if nothing

Question 26

You have to use a toString method to

Answer 26

print out what you want to see

Question 27

precondition

Answer 27

a condition that must be true when a method is called

Question 28

postcondition

Answer 28

a condition that must be true when a method finishes executing

Question 29

using the same method name for multiple methods is ___, the ___ must be unique

Answer 29

overloading, signature