Question 1

An object's properties are also known as what?

methods

instance variables

orientations

messages

class variables

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Question 2

What is another name for an object?

a method

a variable

a data type

an instance of a class

a gadget

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Question 3

Which of the following is the name of an instance variable in the CSC142Point class provided in this week's samples?

private

double

x

xCoord

Point

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Question 4

How many constructors are defined in the CSC142Point class provided in this week's examples?

3

2

1

0

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Question 5

Which of the following is the name of a query method in the CSC142Point class in this week's examples?

Point

double

distance

diffX

public

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Question 6

Which of the following is the name of a mutator (update) method in the CSC142Point class in this week's examples?

getX

setPoint

void

public

newX

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Question 7

Which method in the CSC142Point class returns a reference to a new CSC142Point object?

setX()

getX()

setPoint()

midPoint()

toString()

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Question 8

Which of the following statements is FALSE?

A private method may be called from anywhere within the class in which it is declared.

A public attribute may be examined from anywhere in the program, but may not be changed.

The keyword void indicates that a method does not return any value.

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Question 9

Which of the following things does this statement do? Color darkBrown = new Color( 120, 160, 0 );

declare a new variable

construct a new object

create a binding

All of the above

None of the above

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Question 10

An object diagram represents what?

the makeup of a class

the state of memory at a particular point during the execution of a program

the collection of all possible objects

the same thing as a flowchart

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Question 11

When drawing an object diagram, you evaluate a series of program statements to figure out how they change the contents of memory. Which of the following is a question you should ask as you evaluate each line of code?

Does the line of code declare a variable?

Does the line of code instantiate an object?

Does the line of code create a binding?

All of the above

None of the above

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Question 12

Which of the following valid statements declares a variable? /* 1 */ Oval dot = new Oval(); /* 2 */ dot.setColor( new Color( 0, 0, 255 ) ); /* 3 */ dot.setFilled(); /* 4 */ Oval circle; /* 5 */ circle = dot;

1

1 and 2

1 and 4

1, 4 and 5

None of the above

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Question 13

Which of the following valid statements creates (constructs) an object? [Read very carefully!] /* 1 */ Oval dot = new Oval(); /* 2 */ dot.setColor( new Color( 0, 0, 255 ) ); /* 3 */ dot.setFilled(); /* 4 */ Oval circle; /* 5 */ circle = dot;

1

1 and 2

1 and 4

1, 4 and 5

None of the above

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Question 14

Which of the following valid statements creates a binding (assigns a value to a variable)? /* 1 */ Oval dot = new Oval(); /* 2 */ dot.setColor( new Color( 0, 0, 255 ) ); /* 3 */ dot.setFilled(); /* 4 */ Oval circle; /* 5 */ circle = dot;

1

1 and 4

1 and 5

1, 2, 3 and 5

None of the above

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Question 15

Which of the following valid statements creates an alias? /* 1 */ Oval dot = new Oval(); /* 2 */ dot.setColor( new Color( 0, 0, 255 ) ); /* 3 */ dot.setFilled(); /* 4 */ Oval circle; /* 5 */ circle = dot;

1

2

3

4

5

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Question 16

What is an orphaned object?

an object with no methods

an object which has no references to it

a temporary variable bound to an object

an object with no state

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Question 17

What are the different views of a class?

1. Source code
2. UML Class Diagram
3. Javadoc comments

I

I & II

II & III

I, II, & III

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Question 18

What does the keyword 'this' refer to when used in a statement in code?

the program in which the statement exists

the class in which the statement is located

the particular object executing the statement

the method in which the statement is located

None of the above

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Question 19

Which of the following is the name of the client class; in this code?

public class Marge { public Crayon favorite() { Crayon fav = new Crayon(); return fav; } }

public

Crayon

Marge

favorite

generateCrayon

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Question 20

Which is an access modifier?

public

new

this

String