Question 1

What is the purpose of the ImageIcon class?

Accepted Answer

The ImageIcon class is used to represent...

Question 2

The Random class' setSeed( ) method allows you to restart the pseudo-random number sequence.

Accepted Answer

A) True 
 B)False  True

Question 3

What will be displayed by this command: System.out.println(Math.pow(3, 3-1) ) ;

Accepted Answer

A)   9
B)   8
C)   6
D)   4
E)   27F) A) and B)
G) A) and C)

Question 4

In Java a variable may contain

Accepted Answer

A)   a value or a reference
B)   a package
C)   a method
D)   a class
E)   any of the aboveF) B) and E)
G) B) and D)

Question 5

Given two String variables, s1 and s2, is it possible for (s1 != s2) to be True while (s1.equals(s2)) is also True?
 Why or why not?

Accepted Answer

The condition (s1 != s2) means that s1 a...

Question 6

Consider the following enumeration enum Speed { FAST, MEDIUM, SLOW };

Accepted Answer

A)   The ordinal value of MEDIUM is 2
B)   The ordinal value of SLOW is 1
C)   The name of the Speed enumeration whose ordinal value is zero is FAST
D)   The name of the Speed enumeration whose ordinal value is one is SLOW
E)   None of the aboveF) All of the above
G) A) and E)

Question 7

You may apply the prefix and postfix increment and decrement operators to instances of the Integer class.

Accepted Answer

A) True 
 B)False

Question 8

Autoboxing is

Accepted Answer

A)   the automatic conversion of a wrapper object to/from its corresponding primitive type
B)   the automatic enclosure of a graphics object within a bounding box
C)   the automatic widening of ints into floats or doubles, as required
D)   the automatic conversion of an enumeration into its numeric representation
E)   none of the aboveF) A) and D)
G) B) and D)

Question 9

A JPanel can be added to a JFrame to form a GUI. In order to place other GUI components such as JLabels and Buttons into the JFrame, which of the following messages is passed to the JPanel?

Accepted Answer

A)   insert
B)   include
C)   get
D)   getContentPane
E)   addF) A) and D)
G) B) and E)

Question 10

What happens if you attempt to use a variable before it has been initialized?

Accepted Answer

A)   A syntax error may be generated by the compiler
B)   A runtime error may occur during execution
C)   A "garbage" or "uninitialized" value will be used in the computation
D)   A value of zero is used if a variable has not been initialized
E)   Answers A and B are correctF) A) and D)
G) B) and D)

Question 11

Why does one set up a containment hierarchy?

Accepted Answer

It is common to use multiple layers of n...

Question 12

Consider the condition (x == y). How is this handled if x and y are primitive types?
 How is this handled if x and y are objects?

Accepted Answer

If x and y are primitive types, then the...

Question 13

Only difficult programming problems require a pseudocode solution before the programmer creates the implementation (program) itself.

Accepted Answer

A) True 
 B)False

Question 14

What is the function of the dot operator?

Accepted Answer

A)   It serves to separate the integer portion from the fractional portion of a floating point number
B)   It allows one to access the data within an object when given a reference to the object
C)   It allows one to invoke a method within an object when given a reference to the object
D)   It is used to terminate commands (much as a period terminates a sentence in English) 
E)   Both B and C are correctF) A) and D)
G) A) and C)

Question 15

In Java, "instantiation" means

Accepted Answer

A)   noticing the first time something is used
B)   creating a new object of the class
C)   creating a new alias to an existing object
D)   launching a method
E)   none of the aboveF) All of the above
G) A) and E)

Question 16

The names of the wrapper classes are just the names of the primitive data types, but with an initial capital letter.

Accepted Answer

A) True 
 B)False  False

Question 17

What is autoboxing?

Accepted Answer

Autoboxing provides automatic conversions between primitive values and corresponding wrapper objects. It makes your code shorter by relieving you of the need to provide explicit wrapping of primitive values and explicit extraction of primitive values.
For the questions below: Assume an interactive Java program which asks the user for their first name and last name, and outputs the user's initials.

Question 18

When comparing any primitive type of variable, == should always be used to test to see if two values are equal.

Accepted Answer

A) True 
 B)False

Question 19

These two ways of setting up a string yield identical results:
a) String string = new String("string");
b) String string = "string";

Accepted Answer

A) True 
 B)False

Question 20

Write a statement using a Scanner method to get the first name interactively.

Accepted Answer

firstName ...

Exam 3: Using Classes and Objects

What is the purpose of the ImageIcon class?

Correct Answer
verified
The ImageIcon class is used to represent...
View Answer

The Random class' setSeed( ) method allows you to restart the pseudo-random number sequence.

Correct Answer
verified
True

What will be displayed by this command: System.out.println(Math.pow(3, 3-1) ) ;

Correct Answer
verified

In Java a variable may contain

Correct Answer
verified

Given two String variables, s1 and s2, is it possible for (s1 != s2) to be True while (s1.equals(s2)) is also True? Why or why not?

Correct Answer
verified
The condition (s1 != s2) means that s1 a...
View Answer

Consider the following enumeration enum Speed { FAST, MEDIUM, SLOW };

Correct Answer
verified

You may apply the prefix and postfix increment and decrement operators to instances of the Integer class.

Correct Answer
verified

Autoboxing is

Correct Answer
verified

A JPanel can be added to a JFrame to form a GUI. In order to place other GUI components such as JLabels and Buttons into the JFrame, which of the following messages is passed to the JPanel?

Correct Answer
verified

What happens if you attempt to use a variable before it has been initialized?

Correct Answer
verified

Why does one set up a containment hierarchy?

Correct Answer
verified
It is common to use multiple layers of n...
View Answer

Consider the condition (x == y). How is this handled if x and y are primitive types? How is this handled if x and y are objects?

Correct Answer
verified
If x and y are primitive types, then the...
View Answer

Only difficult programming problems require a pseudocode solution before the programmer creates the implementation (program) itself.

Correct Answer
verified

What is the function of the dot operator?

Correct Answer
verified

In Java, "instantiation" means

Correct Answer
verified

The names of the wrapper classes are just the names of the primitive data types, but with an initial capital letter.

Correct Answer
verified
False

What is autoboxing?

When comparing any primitive type of variable, == should always be used to test to see if two values are equal.

Correct Answer
verified

These two ways of setting up a string yield identical results: a) String string = new String("string"); b) String string = "string";

Correct Answer
verified

Write a statement using a Scanner method to get the first name interactively.

Correct Answer
verified
firstName ...
View Answer

Exam 3: Using Classes and Objects

What is the purpose of the ImageIcon class?

Correct AnswerverifiedThe ImageIcon class is used to represent...View AnswerShow Answer

The Random class' setSeed( ) method allows you to restart the pseudo-random number sequence.

Correct AnswerverifiedTrue

What will be displayed by this command: System.out.println(Math.pow(3, 3-1) ) ;

Correct AnswerverifiedShow Answer

In Java a variable may contain

Correct AnswerverifiedShow Answer

Given two String variables, s1 and s2, is it possible for (s1 != s2) to be True while (s1.equals(s2)) is also True? Why or why not?

Correct AnswerverifiedThe condition (s1 != s2) means that s1 a...View AnswerShow Answer

Consider the following enumeration enum Speed { FAST, MEDIUM, SLOW };

Correct AnswerverifiedShow Answer

You may apply the prefix and postfix increment and decrement operators to instances of the Integer class.

Correct AnswerverifiedShow Answer

Autoboxing is

Correct AnswerverifiedShow Answer

A JPanel can be added to a JFrame to form a GUI. In order to place other GUI components such as JLabels and Buttons into the JFrame, which of the following messages is passed to the JPanel?

Correct AnswerverifiedShow Answer

What happens if you attempt to use a variable before it has been initialized?

Correct AnswerverifiedShow Answer

Why does one set up a containment hierarchy?

Correct AnswerverifiedIt is common to use multiple layers of n...View AnswerShow Answer

Consider the condition (x == y). How is this handled if x and y are primitive types? How is this handled if x and y are objects?

Correct AnswerverifiedIf x and y are primitive types, then the...View AnswerShow Answer

Only difficult programming problems require a pseudocode solution before the programmer creates the implementation (program) itself.

Correct AnswerverifiedShow Answer

What is the function of the dot operator?

Correct AnswerverifiedShow Answer

In Java, "instantiation" means

Correct AnswerverifiedShow Answer

The names of the wrapper classes are just the names of the primitive data types, but with an initial capital letter.

Correct AnswerverifiedFalse

What is autoboxing?

When comparing any primitive type of variable, == should always be used to test to see if two values are equal.

Correct AnswerverifiedShow Answer

These two ways of setting up a string yield identical results: a) String string = new String("string"); b) String string = "string";

Correct AnswerverifiedShow Answer

Write a statement using a Scanner method to get the first name interactively.

Correct AnswerverifiedfirstName ...View AnswerShow Answer

Correct Answer
verified
The ImageIcon class is used to represent...
View Answer

Correct Answer
verified
True

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The condition (s1 != s2) means that s1 a...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
It is common to use multiple layers of n...
View Answer

Correct Answer
verified
If x and y are primitive types, then the...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
False

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
firstName ...
View Answer