Chapter 1

Question 1

Objects

Answer 1

• Created from classes
• represent “things” from the real world or from some problem domain
• represents individual instances of the class
• ie. if class is car, objects are racecar, limousine etc

Question 2

Classes

Answer 2

• represents all objects of a kind
• uppercase
• ie. car

Question 3

Instance

Answer 3

• a particular object
• refer to objects as instances when we want to emphasize that they are of a particular class
• ie. the object is an instance of the class car

Question 4

Objects naming convention

Answer 4

Lowercase

Question 5

Objects have___ which can be invoked, and called what in Java?

Answer 5

-operations
-methods

Question 6

What do methods have to pass additional info needed to execute?

Answer 6

parameters

Question 7

Data type

Answer 7

specifies what kind of data can be passed to the parameter
-integer (int) specifies whole numbers

Question 8

An object has attributes which are?

Answer 8

Values stored in fields

Question 9

The class defines_________ but each object_________

Answer 9

-what fields an object has
-stores its own set of values (the state of the object)

Question 10

State

Answer 10

-The set of values of all attributes defining an object
-inspect in java

Question 11

Each class has a source code ___________________

Answer 11

-(java code) associated with it that defines its details (fields and methods)

Question 12

Compilation

Answer 12

-java is a high level language
-but computers can only interpret low level machine code
-compilers translate programming code into machine code

Question 13

What return type returns a value?

Answer 13

non-void return type

Question 14

Signature

Answer 14

-The method name and the parameter types of a method
-it provides the info needed to invoke the method
ie.
void moveHorizontal (int distance)
signature = moveHorizontal(int)

Question 15

Header

Answer 15

-provides info about the method in question
ie.
void moveHorizontal (int distance)

Question 16

String type

Answer 16

indicates that a section of text (a word or sentence) is expected.
-always enclosed W/I double quotes.

Question 17

Multiple instances

Answer 17

Many similar objects can be created from a single class

Question 18

Fields

Answer 18

Object attributes, when some methods are called the state of the object or attributes changes.
ie. moveLeft changes the xPosition attribute

Question 19

Boolean

Answer 19

A type that can represent 2 values: true or false

Question 20

Result

Answer 20

Methods may return info about an object via a return value.
String getName()
string is the return type

Question 21

Which return type doesn’t return a value

Answer 21

void as in:
void changeName (String replacementName)

Question 22

What happens when you specify a color that is not known in Java?

Answer 22

it turns black

Question 23

What happens when you enter a string without the quotes in Java?

Answer 23

Causes an error
ie:
(yellow is entered)
Error: cannot find symbol - variable yellow

Question 24

Method calling

Answer 24

Objects can communicate by calling each other’s methods

Question 25

Which are considered programming paradigms?
1. Java programming
2. Python programming
3. Object oriented programming
4. Event driven programming
5. Procedural programming
6. Pseudo programming
7. Assembly programming
8. Constructal programming
9. Artificial intelligence programming
10. Functional programming

Answer 25

OOP
Procedural
Assembly
Functional

Question 26

Java is best know for supporting which programming paradigm?

Answer 26

OOP

Question 27

T or F: Java objects model objects from a problem domain

Answer 27

True