Computer Science Chapter 3

Front 1

What are the 2 properties of Objects?

Back 1

State and Behavior

Front 2

What is State?

Back 2

information stored within the object

Front 3

What is Behavior?

Back 3

operations that can be performed on the object

Front 4

What is an Instance Variable or Field?

Back 4

Variables that describe the State of the Object

Front 5

What is an Instance Method?

Back 5

possible Behavior on the Object

Front 6

Instance Variables store single values
True or False?

Back 6

False, Instance Variables can also store entire objects

Front 7

An Instance Method can require arguments and return variables
True or False

Back 7

True

Front 8

An Instance Method can examine and change the variables stored in an Object's Instance Variables
True or False

Back 8

True

Front 9

What is a Class?

Back 9

The group of Instance Variables and Instance Methods that belong to a particular kind of object

Front 10

What is a Class Declaration?

Back 10

declarations of instance variables and instance methods

Front 11

What are Constructors?

Back 11

These methods initialize objects

Front 12

The order of declarations usually matters
True or False

Back 12

False

Front 13

Define Access Modifier

Back 13

is either "public" or "private" and determines whether other classes can access the entity or not

Front 14

It is common for variables to be private, but constructors and instance methods to be public
True or False

Back 14

True

Front 15

A "public" instance variable is an example of Information Hiding
True or False

Back 15

False, "private"

Front 16

What are the parts of an instance method declaration?

Back 16

Access modifier
Result type. If no value is returned, the result type is void
Method name
Parameters
Body

Front 17

Define Overloading

Back 17

when a class contains more than one method with the same name

Front 18

What is it called when a class contains more than one method with the same name?

Back 18

Overloading

Front 19

In order for methods to be overloaded, what is required of the multiple methods?

Back 19

The number or types of parameters are different

Front 20

A Constructor is similar to an instance method, but has no result type and has the same name as the class
True or False

Back 20

True

Front 21

a Class may only have one Constructor
True or False

Back 21

False

Front 22

an object can be described as an Instance of a Class
True or False

Back 22

True

Front 23

newly created Objects can be stored in a variable whose type matches the Object’s Class
True or False

Back 23

True

Front 24

the variable created whose type matches the Object's Class contains the Object
True or False

Back 24

False, the variable contains a Reference to the Object, but not the Object itself

Front 25

what keyword creates an Instance of the Class to be created?

Back 25

new

Front 26

what is the form of an Instance Method Call on an Object?

Back 26

object . method-name ( arguments )

Front 27

what is the sequence when an instance method is called?

Back 27

The program “jumps” to that method
The arguments in the call are copied into the method’s corresponding parameters
The method begins executing
When the method is finished, the program “returns” to the point at which the method was called

Front 28

how would you compile a program with multiple classes?

Back 28

javac Account.java
javac TestAccount.java

Account and TestAccount are only examples

Front 29

when a program compiles multiple classes, it is necessary for the user to compile each dependent class
True or False

Back 29

False, if a .java file has been altered since the compilation then javac will recompile the file automatically. The compiler will also look for files that are necessary