Question 1

Assume the following variable has been declared and given a value as shown:   Which is the value of data.length?

Accepted Answer

A) 4 
B) 3 
C) 12 
D) 6 
A) 4 
B) 3 
C) 12 
D) 6 B

Question 2

Which one of the following statements is a valid initialization of an array named somearray of ten elements?

Accepted Answer

A) int[] somearray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
B) int somearray[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; 
C) int[10] somearray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
D) int somearray[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
A) int[] somearray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
B) int somearray[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; 
C) int[10] somearray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
D) int somearray[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; A

Question 3

Consider the following code snippet:
int val = arr[0][2];
Which value of arr is stored in the val variable?

Accepted Answer

A) the value in the first row and the second column 
B) the value in the first row and the first column 
C) the value in the first row and the third column 
D) the value in the third row and the second column 
A) the value in the first row and the second column 
B) the value in the first row and the first column 
C) the value in the first row and the third column 
D) the value in the third row and the second column C

Question 4

Which statements about array algorithms are true?
I.The array algorithms are building blocks for many programs that process arrays.
II.Java contains ready-made array algorithms for every problem situation.
III.It is inefficient to make multiple passes through an array if you can do everything in one pass.

Accepted Answer

A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III 
A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III

Question 5

Which one of the following is the correct code snippet for calculating the largest value in an integer array list aList?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 6

When an integer literal is added to an array list declared as ArrayList<Integer>, Java performs:

Accepted Answer

A) casting 
B) trimming 
C) auto-boxing 
D) auto-fixing 
A) casting 
B) trimming 
C) auto-boxing 
D) auto-fixing

Question 7

What will be printed by the statements below?

Accepted Answer

A) [Annie, Bob, Charles, Doug, Evelyn] 
B) [Evelyn, Annie, Bob, Doug] 
C) [Evelyn, Doug, Charles] 
D) [Evelyn, Annie, Doug, Charles] 
A) [Annie, Bob, Charles, Doug, Evelyn] 
B) [Evelyn, Annie, Bob, Doug] 
C) [Evelyn, Doug, Charles] 
D) [Evelyn, Annie, Doug, Charles]

Question 8

What is the value of the count variable after the execution of the given code snippet?

Accepted Answer

A) 1 
B) 2 
C) 0 
D) 3 
A) 1 
B) 2 
C) 0 
D) 3

Question 9

What will be printed by the statements below?

Accepted Answer

A) 4 9 11 13 
B) 4 9 15 22 
C) 9 11 13 7 
D) 4 5 6 7 
A) 4 9 11 13 
B) 4 9 15 22 
C) 9 11 13 7 
D) 4 5 6 7

Question 10

Which one of the following statements is correct for displaying the value in the second row and the third column of a two-dimensional, size 3 by 4 array?

Accepted Answer

A) System.out.println(arr[1][2]); 
B) System.out.println(arr[2][3]); 
C) System.out.println(arr[2][1]); 
D) System.out.println(arr[3][2]); 
A) System.out.println(arr[1][2]); 
B) System.out.println(arr[2][3]); 
C) System.out.println(arr[2][1]); 
D) System.out.println(arr[3][2]);

Question 11

Consider the following code snippet:   Which one of the following is true about the check method in the given code snippet?

Accepted Answer

A) The check method counts all the elements with value 0 in an array list passed as a parameter to the method. 
B) The check method removes all the elements with value 0 from an array list passed as a parameter to the method. 
C) The check method counts all the elements with value 0 in an array list passed as a parameter to a method and also returns the count. 
D) The check method adds 0 to the elements of an array list as a parameter to a method and also returns the array list. 
A) The check method counts all the elements with value 0 in an array list passed as a parameter to the method. 
B) The check method removes all the elements with value 0 from an array list passed as a parameter to the method. 
C) The check method counts all the elements with value 0 in an array list passed as a parameter to a method and also returns the count. 
D) The check method adds 0 to the elements of an array list as a parameter to a method and also returns the array list.

Question 12

Consider using a deck of cards as a way to visualize a shuffle algorithm.When two cards shuffle their position, what has to happen to the size of the array holding them?

Accepted Answer

A) It increases by one. 
B) It decreases by one. 
C) It stays the same. 
D) It increases by two. 
A) It increases by one. 
B) It decreases by one. 
C) It stays the same. 
D) It increases by two.

Question 13

What is the output of the following statements?

Accepted Answer

A) 5 true 1 false 
B) 6 true 2 false 
C) 5 false 1 false 
D) 6 true 1 false 
A) 5 true 1 false 
B) 6 true 2 false 
C) 5 false 1 false 
D) 6 true 1 false

Question 14

Which statements about the enhanced for loop are true for arrays of primitive data?
I.It is suitable for all array algorithms.
II.It does not allow the contents of the array to be modified.
III.It does not require the use of an index variable.

Accepted Answer

A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III 
A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III

Question 15

Which one of the following is a correct declaration for a method named passAList with the array list num of size 5 as a parameter?

Accepted Answer

A) public static void passAList(ArrayList num[5]) B) public static void passAList(ArrayList num, 5) C) public static void passAList(ArrayList num) D) public static void passAList(num) A) public static void passAList(ArrayList num[5]) B) public static void passAList(ArrayList num, 5) C) public static void passAList(ArrayList num) D) public static void passAList(num)

Question 16

Which statements are true regarding the differences between arrays and array lists?
I. Arrays are better if the size of a collection will not change.
II. Array lists are more efficient than arrays.
III. Array lists are easier to use than arrays.

Accepted Answer

A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III 
A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III

Question 17

How many elements can be stored in an array of dimension 2 by 3?

Accepted Answer

A) 2 
B) 3 
C) 5 
D) 6 
A) 2 
B) 3 
C) 5 
D) 6

Question 18

It may be necessary to "grow" an array when reading inputs because

Accepted Answer

A) the number of inputs may not be known in advance. 
B) arrays in Java must be resized after every 100 elements. 
C) arrays are based on powers of two. 
D) the only alternative is a bounds exception. 
A) the number of inputs may not be known in advance. 
B) arrays in Java must be resized after every 100 elements. 
C) arrays are based on powers of two. 
D) the only alternative is a bounds exception.

Question 19

Consider the following code snippet:   What is the output of the given code snippet if the user enters 1,2,0,0,1 as the input?

Accepted Answer

A) size is : 1 
B) size is : 2 
C) size is : 4 
D) size is : 0 
A) size is : 1 
B) size is : 2 
C) size is : 4 
D) size is : 0

Question 20

Regression testing is:

Accepted Answer

A) the process of stepping code forward and backward inside a debugger. 
B) the process of testing each method with values to exercise its limits. 
C) the process of testing each version of a program against a test suite. 
D) the process of storing 
A) the process of stepping code forward and backward inside a debugger. 
B) the process of testing each method with values to exercise its limits. 
C) the process of testing each version of a program against a test suite. 
D) the process of storing

Exam 7: Arrays and Array Lists

Assume the following variable has been declared and given a value as shown: Which is the value of data.length?

Which one of the following statements is a valid initialization of an array named somearray of ten elements?

Consider the following code snippet: int val = arr[0][2]; Which value of arr is stored in the val variable?

Which one of the following is the correct code snippet for calculating the largest value in an integer array list aList?

When an integer literal is added to an array list declared as ArrayList<Integer>, Java performs:

What will be printed by the statements below?

What is the value of the count variable after the execution of the given code snippet?

What will be printed by the statements below?

Which one of the following statements is correct for displaying the value in the second row and the third column of a two-dimensional, size 3 by 4 array?

Consider the following code snippet: Which one of the following is true about the check method in the given code snippet?

Consider using a deck of cards as a way to visualize a shuffle algorithm.When two cards shuffle their position, what has to happen to the size of the array holding them?

What is the output of the following statements?

Which statements about the enhanced for loop are true for arrays of primitive data? I.It is suitable for all array algorithms. II.It does not allow the contents of the array to be modified. III.It does not require the use of an index variable.

Which one of the following is a correct declaration for a method named passAList with the array list num of size 5 as a parameter?

Which statements are true regarding the differences between arrays and array lists? I. Arrays are better if the size of a collection will not change. II. Array lists are more efficient than arrays. III. Array lists are easier to use than arrays.

How many elements can be stored in an array of dimension 2 by 3?

It may be necessary to "grow" an array when reading inputs because

Consider the following code snippet: What is the output of the given code snippet if the user enters 1,2,0,0,1 as the input?

Regression testing is:

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