Question 1

Consider the following code snippet:
Int[][] arr =
{
{ 13, 23, 33 },
{ 14, 24, 34 }
};
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]);

Question 2

Babbage's machine for automatically producing printed tables was called

Accepted Answer

A)  the slide rule. 
B)  the difference engine. 
C)  the mechanical calculator. 
D)  the cog wheel.

Question 3

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)  int maximum = 0;
For (int counter = 1; counter  maximum)
{
Maximum = arrList.get(counter);
}
} 
B)  int maximum = arrList.get(0);
For (int counter = 1; counter  maximum)
{
Maximum = arrList.get(counter);
}
} 
C)  int maximum = arrList.get(1);
For (int counter = 1; counter  maximum)
{
Maximum = arrList.get(counter);
}
} 
D)  int maximum = arrList.get(0);
For (int counter = 1; counter > arrList.size(); counter++)
{
If (arrList.get(counter) < maximum)
{
Maximum = arrList.get(counter);
}
}

Question 4

Assume the method createSomething has been defined as follows:
Int [] createSomething (int start, int size)
{
Int [] result = new int[size];
For (int i = 0; i < result.length; i++)
{
Result[i] = start;
Start++;
}
Return result;
}
What is printed by the statement below?
System.out.print (Arrays.toString(createSomething(4, 3)));

Accepted Answer

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

Question 5

Which one of the following is a correct declaration for a method named passAList that has as arguments an array list myList of size 10 and an integer array intArr of size 20, and that modifies the contents of myList and intArr?

Accepted Answer

A) public static void passAList(ArrayList myList(10), int[] intArr) B) public static void passAList(ArrayList myList, int[20] intArr) C) public static void passAList(ArrayList myList, int[] intArr) D) public static void passAList(ArryaList myList, int intArr)

Question 6

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

Question 7

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

Accepted Answer

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

Question 8

If a programmer confuses the method required for checking the length of a string and uses size() instead of length(), what will happen?

Accepted Answer

A)  The program will crash. 
B)  The program will not compile. 
C)  The program will run but will produce an uncertain result. 
D)  The compiler will automatically correct the error.

Question 9

In a partially filled array, the number of slots in the array that are not currently used is

Accepted Answer

A)  the length of the array minus the number of elements currently in the array 
B)  the number of elements currently in the array minus the length of the array 
C)  the length of the array plus the number of elements currently in the array 
D)  the number of elements currently in the array

Question 10

What is the value of myArray[1][2] after this code snippet is executed?
Int count = 0;
Int[][] myArray = new int[4][5];
For (int i = 0; i < 5; i++)
{
For (int j = 0; j < 4; j++)
{
MyArray[j][i] = count;
Count++;
}
}

Accepted Answer

A)  8 
B)  9 
C)  19 
D)  11

Question 11

The binary search is faster 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.

Question 12

What is the output of the following code snippet? ArrayList<Integer> num;
Num)add(4);
System.out.println(num.size());

Accepted Answer

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

Question 13

Consider the following code snippet, where the array lists contain elements that are stored in ascending order: ArrayList list1 = new ArrayList(); ArrayList list2 = new ArrayList(); ) . . Int count = 0; For (int i = 0; i < list1.size() && i < list2.size(); i++) { If (list1.get(i) == list2.get(i)) { Count++; } } Which one of the following descriptions is correct for the given code snippet?

Accepted Answer

A)  The code snippet finds the highest value out of the two array lists. 
B)  The code snippet finds the lowest value out of the two array lists. 
C)  The code snippet compares the values of two array lists and stores the count of total matches found. 
D)  The code snippet adds the values of the two array lists.

Question 14

Why is the following method header invalid? public static int[5] meth(int[] arr, int[] num)

Accepted Answer

A)  Methods that return an array cannot specify its size 
B)  Methods cannot have an array as a return type 
C)  Methods cannot have an array as a parameter variable 
D)  Methods cannot have two array parameter variables

Question 15

Assume the following variable has been declared and given a value as shown:
Int[][] data = {
{9, 17, -4, 21 },
{15, 24, 0, 9},
{6, 2, -56, 8},
};
Which is the value of data[0].length?

Accepted Answer

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

Question 16

Assume the array of integers values has been created and process is a method that has a single integer parameter. Which of the following is equivalent to the loop below? for (int val: values)
{
Process (val);
}

Accepted Answer

A) for (int i = 0; i < values.length; i++) {
Process (values[i]);
} 
B) for (int i = 1; i <= values.length; i++) {
Int val = values[i];
Process (val);
} 
C)  for (int i = 0; i < values.length; i++) {
Int val = values[i];
Process (val);
} 
D) for (int i = 0; i < values.length; i++) {
Process (i);
}

Question 17

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]

Question 18

Which one of the following code snippets accepts the integer input in an array list named num1 and stores the even integers of num1 in another array list named evennum?

Accepted Answer

A) ArrayList num1 = new ArrayList(); ArrayList evennum = new ArrayList(); Scanner in = new Scanner(System.in); Int data; For (int i = 0; i < 10; i++) { Data = in.nextInt(); Num1.add(data); If (num1.get(i) % 2 == 0) { Evennum.add(num1.get(i)); } } B) ArrayList num1 = new ArrayList(); ArrayList evennum = new ArrayList(); Scanner in = new Scanner(System.in); Int data; For (int i = 0; i < 10; i++) { Data = in.nextInt(); Num1.add(data); If (num1.get(i) % 2 != 0) { Evennum.add(num1.get(i)); } } C) ArrayList num1 = new ArrayList(); ArrayList evennum = new ArrayList(); Scanner in = new Scanner(System.in); Int data; For int i = 0; i < 10; i++) { Data = in.nextInt(); Num1.add(data); If (num1.get(i) % 2 != 0) { Evennum[i] = num1[i]; } } D) ArrayList num1 = new ArrayList(); ArrayList evennum = new ArrayList(); Scanner in = new Scanner(System.in); Int data; For (int i = 0; i < 10; i++) { Data = in.nextInt(); Num1.add(data); If (num1.get(i) % 2 == 0) { Evennum[i] = num1[i]; } }

Question 19

Why is the use of physical objects helpful in algorithm design?

Accepted Answer

A)  It simulates the way the computer actually implements the algorithm 
B)  It is more abstract than using a pencil and paper 
C)  Because the constraints on physical things are the same as the constraints on bits and bytes 
D)  Many people feel it is less intimidating than drawing diagrams

Question 20

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 
B)  II 
C)  III 
D)  II, III

Exam 7: Arrays and Array Lists

Consider the following code snippet: Int[][] arr = { { 13, 23, 33 }, { 14, 24, 34 } }; Identify the appropriate statement to display the value 24 from the given array?

Babbage's machine for automatically producing printed tables was called

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

Which one of the following is a correct declaration for a method named passAList that has as arguments an array list myList of size 10 and an integer array intArr of size 20, and that modifies the contents of myList and intArr?

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?

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

If a programmer confuses the method required for checking the length of a string and uses size() instead of length() , what will happen?

In a partially filled array, the number of slots in the array that are not currently used is

What is the value of myArray[1][2] after this code snippet is executed? Int count = 0; Int[][] myArray = new int[4][5]; For (int i = 0; i < 5; i++) { For (int j = 0; j < 4; j++) { MyArray[j][i] = count; Count++; } }

The binary search is faster than the linear search, providing

What is the output of the following code snippet? ArrayList<Integer> num; Num) add(4) ; System.out.println(num.size() ) ;

Why is the following method header invalid? public static int[5] meth(int[] arr, int[] num)

Assume the following variable has been declared and given a value as shown: Int[][] data = { {9, 17, -4, 21 }, {15, 24, 0, 9}, {6, 2, -56, 8}, }; Which is the value of data[0].length?

Assume the array of integers values has been created and process is a method that has a single integer parameter. Which of the following is equivalent to the loop below? for (int val: values) { Process (val) ; }

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?

Which one of the following code snippets accepts the integer input in an array list named num1 and stores the even integers of num1 in another array list named evennum?

Why is the use of physical objects helpful in algorithm design?