Final Gaddis Chap 3 part 2

Question 1

UML diagrams are

Answer 1

language independent

Question 2

UML diagrams use

Answer 2

an independent notation to show return types, access modifiers, etc

Question 3

variable types are placed

Answer 3

after the variable name, separated by a colon
ex:
-width: double

Question 4

Access modifiers are denoted as

Answer 4

+ for public
- for private
# for protected

Question 5

method return types are placed

Answer 5

after the method declaration name, separated by a colon

Question 6

method parameters are placed

Answer 6

inside parenthesis after the setMethod

Question 7

UML order from top to bottom

Answer 7

ClassName, Attributes (Variables to be initiated), Methods (Constructor, getters, setters, calculations)

Question 8

Can methods have multiple parameters?

Answer 8

Yes.

Question 9

Parameters in methods are treated as

Answer 9

local variables within the method

Question 10

In Java, all arguments to a method are passed…

Answer 10

“by value”

Question 11

if the argument is a reference to an object

Answer 11

it is the reference that is passed to the method

Question 12

if the argument is a primitive,

Answer 12

a copy of the value is passed to the method

Question 13

instance fields and methods

Answer 13

fields and methods that are declared as previously shown

Question 14

objects created from a class each have their own copy of

Answer 14

instance fields

Question 15

instance methods are methods that are not declared with a special keyword…

Answer 15

static

Question 16

instance fields and instance methods require

Answer 16

an object to be created in order to be used

Question 17

constructors have a few special properties that set them apart from normal methods

Answer 17

1) have same name as the class
2) have to return type (not even void)
3) they cannot return any values
4) are public

Question 18

write a constructor for the Payroll class with argument String n and int i

Answer 18

public Payroll (String n, int i)
{
name=n;
idNumber=i;
}

Question 19

In a UML chart, you can tell what the constructor is because

Answer 19

it will not have a return type and it will share a name with the class

Question 20

Scope of a variable inside of a method

Answer 20

visible only within that method, called a local variable

Question 21

scope of a variable inside a method parameter

Answer 21

called a parameter variable (same as local variable) and visible only within that method

Question 22

Scope of a variable inside the class but not in a method

Answer 22

visible to all methods of the class, called an instance field

Question 23

within a method, variable names must be

Answer 23

unique

Question 24

shadowing

Answer 24

a method having a local variable with the same name as an instance field (hides value of instance field) this is discouraged