Question 1

The method printf is used only to format the output of integers and decimal numbers.

Accepted Answer

A) True 
 B)False

Question 2

In a format specifier, the option width specifies the maximum number of characters to be written to the output.

Accepted Answer

A) True 
 B)False

Question 3

String variables are reference variables.

Accepted Answer

A) True 
 B)False  True

Question 4

The classes Integer, Float, and Double are called wrapper classes.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following outputs 56734.9875 to three decimal places?

Accepted Answer

A)   System.out.printf("3f%", 56734.9875) ;
B)   System.out.printf(".3f%", 56734.9875) ;
C)   System.out.printf(".03f%", 56734.9875) ;
D)   System.out.printf("%.3f", 56734.9875) ;E) A) and B)
F) C) and D)

Question 6

Based on the code above, what is the value of length1?

Accepted Answer

A)   20
B)   21
C)   24
D)   26E) A) and C)
F) C) and D) C

Question 7

In Java, all variables declared using a class are ____.

Accepted Answer

A)   primitive variables
B)   reference variables
C)   constants
D)   operatorsE) A) and D)
F) B) and C)

Question 8

Which statement instructs a program to run the garbage collector?

Accepted Answer

A)   System.clearGarbage() ;
B)   System.flushGarbage() ;
C)   System.out() ;
D)   System.gc() ;E) A) and B)
F) A) and C)

Question 9

Based on the code above, what is the value of str3?

Accepted Answer

A)   "First exam is on Monday."
B)   "F#rst exam #s on Monday."
C)   "F#rst exam is on Monday."
D)   "#i### #### i###########."E) A) and D)
F) All of the above

Question 10

Suppose z = 1834.762. The output of the statement System.out.printf("%.1f", z); is 1834.800.

Accepted Answer

A) True 
 B)False  False

Question 11

What is the value of the following statement? Math.pow(3,4)

Accepted Answer

A)   7
B)   12
C)   34
D)   81E) All of the above
F) B) and C)

Question 12

The dot (.) operator is also called the member specific operator.

Accepted Answer

A) True 
 B)False

Question 13

In a string, the index (position) of the first character is 1.

Accepted Answer

A) True 
 B)False

Question 14

The value of the expression Integer.parseInt("+782") is "782".

Accepted Answer

A) True 
 B)False

Question 15

Suppose that you have the declaration: int num = 94; double x = 73.92; String str = "Programming"; What is the output of the following statements? System.out.println("123456789012345678901234567890") ; System.out.printf("%5d%6.2f %15s%n", num, x, str) ;

Accepted Answer

A)   123456789012345678901234567890.
B)   123456789012345678901234567890.0
C)   1234567890123456789012345678900
D)   1234567890123456789012345678904E) C) and D)
F) A) and B)

Question 16

In order to use a predefined method, you only need to know the name of the method and the type of each parameter.

Accepted Answer

A) True 
 B)False

Question 17

What is the output of the following statement? System.out.printf("%.2f", 48.9) ;

Accepted Answer

A)   48.00
B)   48.90
C)   49
D)   49.00E) All of the above
F) C) and D)

Question 18

Which of the following statements would store input in name?

Accepted Answer

A)  
B)  
C)  
D)  E) None of the above
F) A) and B)

Question 19

An expression such as str.length() ; is an example of a(n)  ____.

Accepted Answer

A)   system call
B)   object call
C)   class
D)   method callE) C) and D)
F) B) and C)

Question 20

In the class String, the substring method inserts a string into another string.

Accepted Answer

A) True 
 B)False

Exam 3: Introduction to Objects and Inputoutput

The method printf is used only to format the output of integers and decimal numbers.

Correct AnswerverifiedShow Answer

In a format specifier, the option width specifies the maximum number of characters to be written to the output.

Correct AnswerverifiedShow Answer

String variables are reference variables.

Correct AnswerverifiedTrue

The classes Integer, Float, and Double are called wrapper classes.

Correct AnswerverifiedShow Answer

Which of the following outputs 56734.9875 to three decimal places?

Correct AnswerverifiedShow Answer

Based on the code above, what is the value of length1?

Correct AnswerverifiedC

In Java, all variables declared using a class are ____.

Correct AnswerverifiedShow Answer

Which statement instructs a program to run the garbage collector?

Correct AnswerverifiedShow Answer

Based on the code above, what is the value of str3?

Correct AnswerverifiedShow Answer

Suppose z = 1834.762. The output of the statement System.out.printf("%.1f", z); is 1834.800.

Correct AnswerverifiedFalse

What is the value of the following statement? Math.pow(3,4)

Correct AnswerverifiedShow Answer

The dot (.) operator is also called the member specific operator.

Correct AnswerverifiedShow Answer

In a string, the index (position) of the first character is 1.

Correct AnswerverifiedShow Answer

The value of the expression Integer.parseInt("+782") is "782".

Correct AnswerverifiedShow Answer

Suppose that you have the declaration: int num = 94; double x = 73.92; String str = "Programming"; What is the output of the following statements? System.out.println("123456789012345678901234567890") ; System.out.printf("%5d%6.2f %15s%n", num, x, str) ;

Correct AnswerverifiedShow Answer

In order to use a predefined method, you only need to know the name of the method and the type of each parameter.

Correct AnswerverifiedShow Answer

What is the output of the following statement? System.out.printf("%.2f", 48.9) ;

Correct AnswerverifiedShow Answer

Which of the following statements would store input in name?

Correct AnswerverifiedShow Answer

An expression such as str.length() ; is an example of a(n) ____.

Correct AnswerverifiedShow Answer

In the class String, the substring method inserts a string into another string.

Correct AnswerverifiedShow Answer

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True

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C

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False

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