Question 1

Consider the following code snippet:
String[] data = { "123", "ghi", "jkl", "def", "%&*" };
Which statement sorts the data array in ascending order?

Accepted Answer

A) data = Arrays.sort(); 
B) Arrays.sort(data); 
C) data = Arrays.sort(data.length); 
D) data = Arrays.sort(data); 
A) data = Arrays.sort(); 
B) Arrays.sort(data); 
C) data = Arrays.sort(data.length); 
D) data = Arrays.sort(data);

Question 2

Assume the following variable has been declared and given a value as shown:
int[] numbers = {9, 17, -4, 21 };
Which is the value of numbers.length?

Accepted Answer

A) 3 
B) 4 
C) 9 
D) 21 
A) 3 
B) 4 
C) 9 
D) 21

Question 3

Which statement is true about the code snippet below?

Accepted Answer

A) The final size of names is 2; the final size of friends is 3. 
B) The final size of names is 3; the final size of friends is 2. 
C) The final size of names is 3; the final size of friends is 3. 
D) compilation error 
A) The final size of names is 2; the final size of friends is 3. 
B) The final size of names is 3; the final size of friends is 2. 
C) The final size of names is 3; the final size of friends is 3. 
D) compilation error

Question 4

What will be printed by the statements below?

Accepted Answer

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

Question 5

What is the output of the following code snippet?

Accepted Answer

A) 86 2 24 4 
B) 86 24 3 4 
C) 1 86 24 4 
D) 1 2 24 86 
A) 86 2 24 4 
B) 86 24 3 4 
C) 1 86 24 4 
D) 1 2 24 86

Question 6

Which one of the following statements is true about using arrays with methods?

Accepted Answer

A) Arrays can be method arguments, and return values, just like any other values. 
B) A method can only accept arguments that are elements of an array, but not the whole array. 
C) A method may accept an argument that is an array, but it cannot return a result that is an array. 
D) If a method is defined to have an array as a method argument, it must also define the size of the array as another method argument. 
A) Arrays can be method arguments, and return values, just like any other values. 
B) A method can only accept arguments that are elements of an array, but not the whole array. 
C) A method may accept an argument that is an array, but it cannot return a result that is an array. 
D) If a method is defined to have an array as a method argument, it must also define the size of the array as another method argument.

Question 7

Suppose you wish to use an array to solve a new problem.What is the first step to take in finding a solution?

Accepted Answer

A) structure a program using methods 
B) adapt a built-in array algorithm 
C) decompose the problem into steps 
D) assemble a test program and run it 
A) structure a program using methods 
B) adapt a built-in array algorithm 
C) decompose the problem into steps 
D) assemble a test program and run it

Question 8

Consider the following line of code:
int[] somearray = new int[30];
Which one of the following options is a valid line of code for displaying the twenty-eighth element of somearray?

Accepted Answer

A) System.out.println(somearray[28]); 
B) System.out.println(somearray(28)); 
C) System.out.println(somearray(27)); 
D) System.out.println(somearray[27]); 
A) System.out.println(somearray[28]); 
B) System.out.println(somearray(28)); 
C) System.out.println(somearray(27)); 
D) System.out.println(somearray[27]);

Question 9

What is the output of the following code snippet?

Accepted Answer

A) 1 
B) 0 
C) 4 
D) Error because num is not initialized 
A) 1 
B) 0 
C) 4 
D) Error because num is not initialized

Question 10

Which statement correctly describes the enhanced for loop?

Accepted Answer

A) In the enhanced for loop, the element variable is assigned.In the basic for loop, the index variable is assigned. 
B) In the enhanced for loop, the index variable is assigned.In the basic for loop, the element variable is assigned. 
C) The enhanced for loop has a very specific purpose: modifying the contents of the array. 
D) The enhanced for loop has a very specific purpose: initializing the contents of the array. 
A) In the enhanced for loop, the element variable is assigned.In the basic for loop, the index variable is assigned. 
B) In the enhanced for loop, the index variable is assigned.In the basic for loop, the element variable is assigned. 
C) The enhanced for loop has a very specific purpose: modifying the contents of the array. 
D) The enhanced for loop has a very specific purpose: initializing the contents of the array.

Question 11

What should you check for when calculating the smallest 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 maximum value in the first element. 
D) The array list contains the minimum 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 maximum value in the first element. 
D) The array list contains the minimum value in the first element.

Question 12

Which one of the following is the correct code snippet for calculating the largest value in an integer array list arrList of size 10?

Accepted Answer

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

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 p1 and p2 of the array values. 
C) It moves each element of the array values to a higher index position. 
D) It inserts a new value into the array values. 
A) It copies the integer array values to a new array. 
B) It swaps the integer values stored in positions p1 and p2 of the array values. 
C) It moves each element of the array values to a higher index position. 
D) It inserts a new value into the array values.

Question 14

Assume the method doSomething has been defined as follows:   What is printed by the statements below?
int [] nums = {3, 18, 29, -2} ;
System.out.print(Arrays.toString(doSomething(nums)));

Accepted Answer

A) [4, 19, 30, -1] 
B) [21, 47, 27] 
C) [21, 50, 48] 
D) [3, 21, 47, 27] 
A) [4, 19, 30, -1] 
B) [21, 47, 27] 
C) [21, 50, 48] 
D) [3, 21, 47, 27]

Question 15

Assume the following variable has been declared and given a value as shown:   Which is the value of data[0].length?

Accepted Answer

A) 21 
B) 12 
C) 4 
D) 3 
A) 21 
B) 12 
C) 4 
D) 3

Question 16

Which one of the following statements is the correct declaration for a two-dimensional array of 20 rows and 2 columns of type int?

Accepted Answer

A) int[][] num = new int[20][2]; 
B) int[][] num = new int[2][20]; 
C) int[][] num = new int[20,2]; 
D) int[][] num = new int[2,20]; 
A) int[][] num = new int[20][2]; 
B) int[][] num = new int[2][20]; 
C) int[][] num = new int[20,2]; 
D) int[][] num = new int[2,20];

Question 17

The binary search is more efficient than the linear search, providing

Accepted Answer

A) the size of the array is a power of two. 
B) the elements of the array are ordered. 
C) the elements of the array are unordered. 
D) the element being searched for is actually in the array. 
A) the size of the array is a power of two. 
B) the elements of the array are ordered. 
C) the elements of the array are unordered. 
D) the element being searched for is actually in the array.

Question 18

Assume the array of integers values has been created.Which condition must be used in the indicated area so the loop below will assign max the largest value in values?

Accepted Answer

A) current > max 
B) max > current 
C) max > values[current] 
D) values[current] > max 
A) current > max 
B) max > current 
C) max > values[current] 
D) values[current] > max

Question 19

Identify the correct statement for defining an integer array named numarray of ten elements.

Accepted Answer

A) int[] numarray = new int[9]; 
B) int[] numarray = new int[10]; 
C) int[10] numarray; 
D) int numarray[10]; 
A) int[] numarray = new int[9]; 
B) int[] numarray = new int[10]; 
C) int[10] numarray; 
D) int numarray[10];

Question 20

Consider the following code snippet:   Which statement is true after the main method is executed?

Accepted Answer

A) names contains "Janet", "Jerry", "John" in this order. 
B) names contains "John", "Jerry", "Janet" in this order. 
C) reverse method has a bound error. 
D) Compilation error due to the return statement in reverse method. 
A) names contains "Janet", "Jerry", "John" in this order. 
B) names contains "John", "Jerry", "Janet" in this order. 
C) reverse method has a bound error. 
D) Compilation error due to the return statement in reverse method.

Exam 7: Arrays and Array Lists

Consider the following code snippet: String[] data = { "123", "ghi", "jkl", "def", "%&*" }; Which statement sorts the data array in ascending order?

Assume the following variable has been declared and given a value as shown: int[] numbers = {9, 17, -4, 21 }; Which is the value of numbers.length?

Which statement is true about the code snippet below?

What will be printed by the statements below?

What is the output of the following code snippet?

Which one of the following statements is true about using arrays with methods?

Suppose you wish to use an array to solve a new problem.What is the first step to take in finding a solution?

Consider the following line of code: int[] somearray = new int[30]; Which one of the following options is a valid line of code for displaying the twenty-eighth element of somearray?

What is the output of the following code snippet?

Which statement correctly describes the enhanced for loop?

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

Which one of the following is the correct code snippet for calculating the largest value in an integer array list arrList of size 10?

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

Assume the method doSomething has been defined as follows: What is printed by the statements below? int [] nums = {3, 18, 29, -2} ; System.out.print(Arrays.toString(doSomething(nums)));

Assume the following variable has been declared and given a value as shown: Which is the value of data[0].length?

Which one of the following statements is the correct declaration for a two-dimensional array of 20 rows and 2 columns of type int?

The binary search is more efficient than the linear search, providing

Assume the array of integers values has been created.Which condition must be used in the indicated area so the loop below will assign max the largest value in values?

Identify the correct statement for defining an integer array named numarray of ten elements.

Consider the following code snippet: Which statement is true after the main method is executed?

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