Question 1

Suppose you wish to process an array of values and eliminate any potential duplicate values stored in the array.Which array algorithms might be adapted for this?

Accepted Answer

A) find the minimum 
B) remove an element 
C) add an element 
D) calculate the sum of the elements 
A) find the minimum 
B) remove an element 
C) add an element 
D) calculate the sum of the elements

Question 2

Consider the following code snippet:
String[] data = { "abc", "def", "ghi", "jkl" };
Using Java 6 or later, which statement grows the data array to twice its size?

Accepted Answer

A) data = Arrays.copyOf(data, 2 * data.length); 
B) data = Arrays.copyOf(data, 2); 
C) data = Arrays.copyOf(data, 2 * data); 
D) data = Arrays.copyOf(data, 2 * data.size()); 
A) data = Arrays.copyOf(data, 2 * data.length); 
B) data = Arrays.copyOf(data, 2); 
C) data = Arrays.copyOf(data, 2 * data); 
D) data = Arrays.copyOf(data, 2 * data.size());

Question 3

What is the valid range of index values for an array of size 10?

Accepted Answer

A) 0 to 9 
B) 0 to 10 
C) 1 to 9 
D) 1 to 10 
A) 0 to 9 
B) 0 to 10 
C) 1 to 9 
D) 1 to 10

Question 4

Consider the following code snippet:   What value is stored in the element of the array list at index 0?

Accepted Answer

A) 0 
B) 3 
C) 6 
D) None 
A) 0 
B) 3 
C) 6 
D) None

Question 5

Assume the method createSomething has been defined as follows:

Accepted Answer

A) [3, 4, 5, 6] 
B) [4, 4, 4] 
C) [3, 3, 3, 3] 
D) [4, 5, 6] 
A) [3, 4, 5, 6] 
B) [4, 4, 4] 
C) [3, 3, 3, 3] 
D) [4, 5, 6]

Question 6

What is the output of the following statements?

Accepted Answer

A) Cal, Bob, Ann 
B) Ann, Bob 
C) Ann, Cal, Tony 
D) array list bound error 
A) Cal, Bob, Ann 
B) Ann, Bob 
C) Ann, Cal, Tony 
D) array list bound error

Question 7

What is the output of the given code snippet?

Accepted Answer

A) 2345 
B) 1234 
C) 1345 
D) 1111 
A) 2345 
B) 1234 
C) 1345 
D) 1111

Question 8

Consider the following code snippet.Which statement should be used to fill in the empty line so that the output will be [32, 54, 67.5, 29, 35]?

Accepted Answer

A) String str = Arrays.format(data); 
B) String str = data.toString(); 
C) String str = Arrays.toString(data); 
D) String str = str + ", " + data[i]; 
A) String str = Arrays.format(data); 
B) String str = data.toString(); 
C) String str = Arrays.toString(data); 
D) String str = str + ", " + data[i];

Question 9

What should you check for when calculating the largest value in an array list?

Accepted Answer

A) The array list contains at least one element. 
B) The array list contains at least two elements. 
C) The array list contains the minimum value in the first element. 
D) The array list contains the maximum value in the first element. 
A) The array list contains at least one element. 
B) The array list contains at least two elements. 
C) The array list contains the minimum value in the first element. 
D) The array list contains the maximum value in the first element.

Question 10

The code snippet below is intended to perform a linear search on the array values to find the location of the value 42.What is the error in the code snippet?

Accepted Answer

A) The boolean variable found should be initialized to false. 
B) The condition in the while loop should be (pos <= values.length && !found). 
C) The variable pos should be initialized to 1. 
D) The condition in the if statement should be (values[pos] <= searchedValue). 
A) The boolean variable found should be initialized to false. 
B) The condition in the while loop should be (pos <= values.length && !found). 
C) The variable pos should be initialized to 1. 
D) The condition in the if statement should be (values[pos] <= searchedValue).

Question 11

Which statement(s) about the size of a Java array, array list, and string are true?
I.The syntax for determining the size of an array, an array list, and a string in Java is consistent among the three.
II.The string uses s.size(), while the array list uses a.length().
III.The array uses a.length, which is not a method call.

Accepted Answer

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

Question 12

Assume the variable numbers has been declared to be an array that has at least one element.Which is the following represents the last element in numbers?

Accepted Answer

A) numbers[numbers.length] 
B) numbers.length 
C) numbers[-1] 
D) numbers[numbers.length - 1] 
A) numbers[numbers.length] 
B) numbers.length 
C) numbers[-1] 
D) numbers[numbers.length - 1]

Question 13

Assume the method doSomething has been defined as follows:   What does the method do?

Accepted Answer

A) It copies the integer array values to a new array. 
B) It swaps the integer values stored in positions i and i - 1 of the array values. 
C) It moves each element of the array values to a lower index position and overwrites the first element. 
D) It overwrites all the values stored in the integer array values with the value stored in position 0. 
A) It copies the integer array values to a new array. 
B) It swaps the integer values stored in positions i and i - 1 of the array values. 
C) It moves each element of the array values to a lower index position and overwrites the first element. 
D) It overwrites all the values stored in the integer array values with the value stored in position 0.

Question 14

What is the result of executing this code snippet?

Accepted Answer

A) The code snippet does not give any output. 
B) The code snippet displays all the marks stored in the array without any redundancy. 
C) The code snippet causes a bounds error. 
D) The code snippet executes an infinite loop. 
A) The code snippet does not give any output. 
B) The code snippet displays all the marks stored in the array without any redundancy. 
C) The code snippet causes a bounds error. 
D) The code snippet executes an infinite loop.

Question 15

Consider the following code snippet in Java 6 or later:   What does the last element of data2 contain?

Accepted Answer

A) "abc" 
B) "def" 
C) "ghi" 
D) "jkl" 
A) "abc" 
B) "def" 
C) "ghi" 
D) "jkl"

Question 16

What is displayed after executing the given code snippet?

Accepted Answer

A) The code snippet displays the total marks of all ten subjects. 
B) The for loop causes a run-time time error on the first iteration. 
C) The code snippet causes a bounds error. 
D) The code snippet displays zero. 
A) The code snippet displays the total marks of all ten subjects. 
B) The for loop causes a run-time time error on the first iteration. 
C) The code snippet causes a bounds error. 
D) The code snippet displays zero.

Question 17

Consider the following code snippet:   Identify the appropriate statement to display the value 24 from the given array?

Accepted Answer

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

Question 18

Assume the method doSomething has been defined as follows:   What does the method do?

Accepted Answer

A) It copies the integer array values to a new array. 
B) It copies all but the first element in the integer array values to a new array. 
C) It moves each element of the array values to a lower index position and overwrites the first element. 
D) It overwrites all the values stored in the integer array values with the value stored in position 0. 
A) It copies the integer array values to a new array. 
B) It copies all but the first element in the integer array values to a new array. 
C) It moves each element of the array values to a lower index position and overwrites the first element. 
D) It overwrites all the values stored in the integer array values with the value stored in position 0.

Question 19

Consider the following code snippet:   What is the output of the given code snippet on execution?

Accepted Answer

A) 5 
B) 7 
C) 9 
D) 10 
A) 5 
B) 7 
C) 9 
D) 10

Question 20

The following statement gets an element from position 4 in an array:
x = a[4];
What is the equivalent operation using an array list?

Accepted Answer

A) x = a.get(4); 
B) x = a.get(); 
C) x = a.get[4]; 
D) x = a[4]; 
A) x = a.get(4); 
B) x = a.get(); 
C) x = a.get[4]; 
D) x = a[4];

Exam 7: Arrays and Array Lists

Suppose you wish to process an array of values and eliminate any potential duplicate values stored in the array.Which array algorithms might be adapted for this?

Consider the following code snippet: String[] data = { "abc", "def", "ghi", "jkl" }; Using Java 6 or later, which statement grows the data array to twice its size?

What is the valid range of index values for an array of size 10?

Consider the following code snippet: What value is stored in the element of the array list at index 0?

Assume the method createSomething has been defined as follows:

What is the output of the following statements?

What is the output of the given code snippet?

Consider the following code snippet.Which statement should be used to fill in the empty line so that the output will be [32, 54, 67.5, 29, 35]?

What should you check for when calculating the largest value in an array list?

The code snippet below is intended to perform a linear search on the array values to find the location of the value 42.What is the error in the code snippet?

Assume the variable numbers has been declared to be an array that has at least one element.Which is the following represents the last element in numbers?

Assume the method doSomething has been defined as follows: What does the method do?

What is the result of executing this code snippet?

Consider the following code snippet in Java 6 or later: What does the last element of data2 contain?

What is displayed after executing the given code snippet?

Consider the following code snippet: Identify the appropriate statement to display the value 24 from the given array?

Assume the method doSomething has been defined as follows: What does the method do?

Consider the following code snippet: What is the output of the given code snippet on execution?

The following statement gets an element from position 4 in an array: x = a[4]; What is the equivalent operation using an array list?

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