Question 1

Given the following code, what will be the value of finalAmount when it is displayed?
Public class Order
{
Private int orderNum;
Private double orderAmount;
Private double orderDiscount;
Public Order(int orderNumber, double orderAmt,
Double orderDisc) 
{
OrderNum = orderNumber;
OrderAmount = orderAmt;
OrderDiscount = orderDisc;
}
Public int getOrderAmount() 
{
Return orderAmount;
}
Public int getOrderDisc() 
{
Return orderDisc;
}
}
Public class CustomerOrder
{
Public static void main(String[] args) 
{
Int ordNum = 1234;
Double ordAmount = 580.00;
Double discountPer = .1;
Order order;
Double finalAmount = order.getOrderAmount()  -
Order.getOrderAmount()  * order.getOrderDisc() ;
System.out.printf("Final order amount = $%,.2f
",
FinalAmount) ;
}
}

Accepted Answer

A)   528.00
B)   580.00
C)   There is no value because the constructor has an error.
D)   There is no value because the object order has not been created.E) A) and D)
F) All of the above

Question 2

A constructor is a method that is automatically called when an object is created.

Accepted Answer

A) True 
 B)False  True

Question 3

Instance methods do not have the key word static in their headers.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is NOT involved in finding the classes when developing an object-oriented application?

Accepted Answer

A)   Describe the problem domain.
B)   Identify all the nouns.
C)   Write the code.
D)   Refine the list of nouns to include only those that are relevant to the problem.E) B) and C)
F) A) and D)

Question 5

Which of the following are classes from the Java API?

Accepted Answer

A)   Scanner
B)   Random
C)   PrintWriter
D)   All of the aboveE) A) and B)
F) A) and C)

Question 6

The scope of a private instance field is:

Accepted Answer

A)   the instance methods of the same class
B)   inside the class, but not inside any method
C)   inside the parentheses of a method header
D)   the method in which they are definedE) C) and D)
F) A) and B)

Question 7

Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.

Accepted Answer

A)   fields
B)   instances
C)   methods
D)   relationshipsE) C) and D)
F) A) and B)

Question 8

What does the following UML diagram entry mean?
+ setHeight(h : double)  : void

Accepted Answer

A)   this is a public attribute named Height and is a double data type
B)   this is a private method with no parameters and returns a double data type
C)   this is a private attribute named Height and is a double data type
D)   this is a public method with a parameter of data type double and does not return a valueE) A) and D)
F) A) and C)

Question 9

For the following code, which statement is NOT true?
Public class Sphere
{
Private double radius;
Public double x;
Private double y;
Private double z;
}

Accepted Answer

A)   x is available to code that is written outside the Circle class.
B)   radius is not available to code written outside the Circle class.
C)   radius, x, y, and z are called members of the Circle class.
D)   z is available to code that is written outside the Circle class.E) A) and B)
F) All of the above

Question 10

Look at the following statement. import java.util.Scanner;
This is an example of

Accepted Answer

A)   a wildcard import
B)   an explicit import
C)   unconditional import
D)   conditional importE) A) and B)
F) A) and C) B

Question 11

Instance methods do not have this key word in their headers:

Accepted Answer

A)   public
B)   static
C)   private
D)   protectedE) All of the above
F) None of the above

Question 12

A UML diagram does not contain:

Accepted Answer

A)   the class name
B)   the method names
C)   the field names
D)   object namesE) All of the above
F) B) and C)

Question 13

A constructor is a method that:

Accepted Answer

A)   returns an object of the class.
B)   never receives any arguments.
C)   with the name ClassName.constructor.
D)   performs initialization or setup operations.E) All of the above
F) A) and B)

Question 14

Which of the following statements will create a reference, str, to the string, "Hello, world"?
(1)  String str = new String("Hello, world") ;
(2)  String str = "Hello, world";

Accepted Answer

A)   1
B)   2
C)   1 and 2
D)   neither 1 or 2E) B) and D)
F) B) and C)

Question 15

A class's responsibilities include:

Accepted Answer

A)   the things a class is responsible for doing
B)   the things a class is responsible for knowing
C)   both A and B
D)   neither A nor BE) B) and C)
F) A) and C)

Question 16

After the header, the body of the method appears inside a set of:

Accepted Answer

A)   brackets, []
B)   parentheses, () 
C)   braces, {}
D)   double quotes, ""E) B) and D)
F) None of the above

Question 17

One or more objects may be created from a(n) :

Accepted Answer

A)   field
B)   class
C)   method
D)   instanceE) None of the above
F) A) and B)

Question 18

Shadowing is the term used to describe where the field name is hidden by the name of a local or parameter variable.

Accepted Answer

A) True 
 B)False

Question 19

You should not define a class field that is dependent upon the values of other class fields:

Accepted Answer

A)   in order to avoid having stale data
B)   because it is redundant
C)   because it should be defined in another class
D)   in order to keep it currentE) B) and D)
F) B) and C)

Question 20

When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable.

Accepted Answer

A) True 
 B)False  False

Exam 6: A First Look at Classes

Correct Answer
verified

A constructor is a method that is automatically called when an object is created.

Correct Answer
verified
True

Instance methods do not have the key word static in their headers.

Correct Answer
verified

Which of the following is NOT involved in finding the classes when developing an object-oriented application?

Correct Answer
verified

Which of the following are classes from the Java API?

Correct Answer
verified

The scope of a private instance field is:

Correct Answer
verified

Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.

Correct Answer
verified

What does the following UML diagram entry mean? + setHeight(h : double) : void

Correct Answer
verified

For the following code, which statement is NOT true? Public class Sphere { Private double radius; Public double x; Private double y; Private double z; }

Correct Answer
verified

Look at the following statement. import java.util.Scanner; This is an example of

Correct Answer
verified
B

Instance methods do not have this key word in their headers:

Correct Answer
verified

A UML diagram does not contain:

Correct Answer
verified

A constructor is a method that:

Correct Answer
verified

Which of the following statements will create a reference, str, to the string, "Hello, world"? (1) String str = new String("Hello, world") ; (2) String str = "Hello, world";

Correct Answer
verified

A class's responsibilities include:

Correct Answer
verified

After the header, the body of the method appears inside a set of:

Correct Answer
verified

One or more objects may be created from a(n) :

Correct Answer
verified

Shadowing is the term used to describe where the field name is hidden by the name of a local or parameter variable.

Correct Answer
verified

You should not define a class field that is dependent upon the values of other class fields:

Correct Answer
verified

When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable.

Correct Answer
verified
False

Exam 6: A First Look at Classes

Correct AnswerverifiedShow Answer

A constructor is a method that is automatically called when an object is created.

Correct AnswerverifiedTrue

Instance methods do not have the key word static in their headers.

Correct AnswerverifiedShow Answer

Which of the following is NOT involved in finding the classes when developing an object-oriented application?

Correct AnswerverifiedShow Answer

Which of the following are classes from the Java API?

Correct AnswerverifiedShow Answer

The scope of a private instance field is:

Correct AnswerverifiedShow Answer

Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.

Correct AnswerverifiedShow Answer

What does the following UML diagram entry mean? + setHeight(h : double) : void

Correct AnswerverifiedShow Answer

For the following code, which statement is NOT true? Public class Sphere { Private double radius; Public double x; Private double y; Private double z; }

Correct AnswerverifiedShow Answer

Look at the following statement. import java.util.Scanner; This is an example of

Correct AnswerverifiedB

Instance methods do not have this key word in their headers:

Correct AnswerverifiedShow Answer

A UML diagram does not contain:

Correct AnswerverifiedShow Answer

A constructor is a method that:

Correct AnswerverifiedShow Answer

Which of the following statements will create a reference, str, to the string, "Hello, world"? (1) String str = new String("Hello, world") ; (2) String str = "Hello, world";

Correct AnswerverifiedShow Answer

A class's responsibilities include:

Correct AnswerverifiedShow Answer

After the header, the body of the method appears inside a set of:

Correct AnswerverifiedShow Answer

One or more objects may be created from a(n) :

Correct AnswerverifiedShow Answer

Shadowing is the term used to describe where the field name is hidden by the name of a local or parameter variable.

Correct AnswerverifiedShow Answer

You should not define a class field that is dependent upon the values of other class fields:

Correct AnswerverifiedShow Answer

When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable.

Correct AnswerverifiedFalse

Correct Answer
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Correct Answer
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True

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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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False