Methods & classes

Question 1

What do you call an entity in your program that you can change/manipulate?

Answer 1

Object

Question 2

What other term can you call an Object?

Answer 2

Method

Question 3

System.out

Answer 3

Object

Question 4

How can you manipulate the System.out object?

Answer 4

Using println method

Question 5

Is println a method?

Answer 5

yes

Question 6

What else do we think of an object as?

Answer 6

a black box

Question 7

Does an object have a public interface?

Answer 7

yes

Question 8

What is a public interface

Answer 8

methods that you call

Question 9

What does an implementation do?

Answer 9

Uses code and data to make methods work

Question 10

Different or similar: System.out and “Hello, World!” Why?

Answer 10

different, because they are different classes

Question 11

What class supports a number of methods?

Answer 11

String class

Question 12

How do you construct any object?

Answer 12

1. use the NEW operator
2. give the name of the CLASS
3. supply construction PARAMETERS with parenthesis

Question 13

variable

Answer 13

item of information in memory

Question 14

cerealBox

Answer 14

variable

Question 15

How do you initialize the variable Rectangle cerealBox;?

Answer 15

Use the new operator which will create an object and return its location

Question 16

What is an object location called?

Answer 16

object reference

Question 17

What does an access specifier do?

Answer 17

controls which other methods can call this method

Question 18

Should most methods be declared as Public?

Answer 18

Yes

Question 19

What statement terminates a method?

Answer 19

return ();

Question 20

What are instance fields generally declared as?

Answer 20

private

Question 21

What happens if the instance fields are declared as private?

Answer 21

all date access must run through the Public Methods

Question 22

What does an instance field belong to?

Answer 22

A class

Question 23

What does the constructor always have the same as?

Answer 23

class of the objects it constructs

Question 24

What do constructors NOT have?

Answer 24

return types

Question 25

What do constructors and methods form?

Answer 25

Public interface

Question 26

What happens when the same name is used for more than one method/constructor?

Answer 26

Overloaded

Question 27

What do local and parameter variables belong to?

Answer 27

Methods

Question 28

What is the difference between local and instance vairables?

Answer 28

Initialization

Question 29

What are instance fields initialized with if there is no constructor?

Answer 29

a default value

Question 30

An object is a “black box” with a public BLANK and a hidden BLANK.

Answer 30

interface, implementation

Question 31

An object stores its state in one or more variables called…

Answer 31

Instance fields

Question 32

true or false: instance fields are initialized to a default value

Answer 32

true

Question 33

true or false: java initializes local variables to a default value

Answer 33

false

Question 34

What does it mean for a constructor or method to be overloaded?

Answer 34

same name but different parameters

Question 35

What is the lifetime of a local variable?

Answer 35

within the method or constructor

Question 36

System is a:

Answer 36

class

Question 37

out is an:

Answer 37

object

Question 38

println is a:

Answer 38

method

Question 39

Public Unicorn is a :

Answer 39

class

Question 40

Unicorn connect = new Unicorn(); is a :

Answer 40

object

Question 41

public void getName() is a :

Answer 41

method

Question 42

What is NUM_SIDES?

Answer 42

a constant