Week 4

Question 1

The portion of the program that can refer to the declared entity is referred to as the _____ of a declaration

Answer 1

Scope

Question 2

The scope of a parameter is

Answer 2

The body of the method that the parameter is a part of

Question 3

Scope: This type appears from the declaration to the end of the block

Answer 3

Local scope

Question 4

Scope - The entire body of the class

Answer 4

Field scope

Question 5

Are variable declarations limited only to certain blocks?

Answer 5

No, any block may conain variable declarations

Question 6

If a local var/parameter has the same name as a field variable, what happens to the field variable? What is this called?

Answer 6

The field is hidden until the block finishes executing. This is called shadowing.

Question 7

A class variable is like a field variable but it is

Answer 7

static (sometimes referred to as static fields)

Question 8

Every instance of the class shares a _____ ________, which is in one fixed location in memory. This means any instances will access the same static ________

Answer 8

Class variable, variable

Question 9

Do static fields belong to the class, or the instances of a class?

Answer 9

They belong to the class

Question 10

T/F - Values of non-static fields are the same for every object

Answer 10

False

Question 11

A field declared static and final is also called

Answer 11

A constant

Question 12

T/F - Static methods can be accessed by all instances of a class

Answer 12

True

Question 13

T/F - A static method/Class method belongs to the class, not the instance of a class

Answer 13

True

Question 14

T/F - Methods that are defined in an instance are only accessible by that member of a class

Answer 14

True

Question 15

3 things that happen when a variable or method is declared static

Answer 15

1. Loaded into memory first
2. Loaded into memory only once
3. Loaded as part of the class, not an object

Question 16

T/F - Any references made to static members will create a new member

Answer 16

False

Question 17

T/F - the Math class is a static method

Answer 17

True

Question 18

T/F - Method arguments for a static method may be variables and expressions, but not constants

Answer 18

False. They may be Vars, expressions, or constants

Question 19

T/F - Math.ceil, math.floor, and math.exp are examples of Math methods

Answer 19

True

Question 20

T/F - Math.power, math.sub, math.sin are examples of math methods

Answer 20

False - math.sub is not

Question 21

T/F math.log, math.max, math.sqrt are examples of math methods

Answer 21

True

Question 22

Each object of a class maintains its ___ ____ of every instance variable of the class

Answer 22

own copy

Question 23

T/F - Instance variables are referred to as fields, static variables are not

Answer 23

False, both are fields

Question 24

The PI and E constants in the Math class are declared with the modifiers public, _____, and ______

Answer 24

final and static