Deck 6: Arrays and Arraylists

Question 1

When the order of the elements is unimportant, what is the most efficient way to remove an element from an array?

A) Delete the element and move each element after that one to a lower index.
B) Replace the element to be deleted with the last element in the array.
C) Replace the element to be deleted with the first element in the array.
D) Replace the element with the next element.

Answer 1

B

Question 2

Which statements are true about the buffer overrun attack launched over the Internet in 1988?
I) The buffer overrun exploited a program that was written in C running on the Unix operating system
II) The Java programming language generates a run-time exception when buffer overrun occurs
III) In recent years computer attacks have lessened

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

Answer 2

A

Question 3

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

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

Answer 3

B

Question 4

Which one of the following statements is correct for the given code snippet?
Int[] number = new int[3]; // Line 1
Number[3] = 5; // Line 2

A) Line 2 declares and initializes an array of three elements with value 5.
B) Line 2 causes a bounds error because 3 is an invalid index number.
C) Line 2 initializes the third element of the array with value 5.
D) Line 2 initializes all the elements of the array with value 5.

Question 5

Which one of the following statements is correct about the given code snippet?
Int[] somearray = new int[6];
For (int i = 1; i < 6; i++)
{
Somearray[i] = i + 1;
}

A) The for loop initializes all the elements of the array.
B) The for loop initializes all the elements except the first element.
C) The for loop initializes all the elements except the last element.
D) The for loop initializes all the elements except the first and last elements.

Question 6

What is the result of the following code?
For (double element : values)
{
Element = 0;
}

A) The elements of the array values are initialized to zero.
B) The elements of the array element are initialized to zero.
C) The first element of the array values is initialized to zero.
D) The array values is not modified.

Question 7

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

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 };

Question 8

Complete the following code snippet with the correct enhanced for loop so it iterates over the array without using an index variable.
String[] arr = { "abc", "def", "ghi", "jkl" };
___________________
{
System.out.print(str);
}

A) for (String str : arr)
B) for (str : String arr)
C) for (str[] : arr)
D) for (arr[] : str)

Question 9

What is the result of executing this code snippet?
Int[] marks = { 90, 45, 67 };
For (int i = 0; i <= 3; i++)
{
System.out.println(marks[i]);
}

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 10

When an array myArray is only partially filled, how can the programmer keep track of the current number of elements?

A) access myArray.length()
B) maintain a companion variable that stores the current number of elements
C) access myArray.currentElements()
D) access myArray.length() - 1

Question 11

Suppose you wish to write a method that returns the sum of the elements in the partially filled array myArray. Which is a reasonable method header?

A) public static int sum(int[] values)
B) public static int sum()
C) public static int sum(int[] values, int currSize)
D) public static int sum(int[] values, int size, int currSize)

Question 12

What is displayed after executing the given code snippet?
Int[] mymarks = new int[10];
Int total = 0;
Scanner in = new Scanner(System.in);
For (int cnt = 1; cnt <= 10; cnt++)
{
System.out.print("Enter the marks: ");
Mymarks[cnt] = in.nextInt();
Total = total + mymarks[cnt];
}
System.out.println(total);

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 13

What is the output of the following code snippet?
Int[] myarray = { 10, 20, 30, 40, 50 };
System.out.print(myarray[2]);
System.out.print(myarray[3]);

A) 1050
B) 2030
C) 3040
D) 4050

Question 14

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

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 15

Which statements about the enhanced for loop are true?
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

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

Question 16

The enhanced for loop

A) is convenient for traversing all elements in an array
B) is convenient for traversing elements in a partially filled array
C) is only used for arrays of integers
D) is used to initialize all array elements to a common value

Question 17

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

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

Question 18

What is the output of the given code snippet?
Int[] mynum = new int[5];
For (int i = 1; i < 5; i++)
{
Mynum[i] = i + 1;
System.out.print(mynum[i]);
}

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

Question 19

Which code snippet prints out the elements in a partially filled array of integers?

A) for (int i = 0; i < myArray.length(); i++)
{
System.out.print(myArray[i]);
}
B) for (int i = 0; i < myArray.currLength(); i++)
{
System.out.print(myArray[i]);
}
C) for (int i = 0; i < currLength; i++)
{
System.out.print(myArray[i]);
}
D) for (int i = 0; i < myArray.length(); i++)
{
System.out.print(myArray[currLength]);
}

Question 20

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?

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 21

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

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 22

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

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

Question 23

When an array reading and storing input runs out of space

A) the program must be recompiled with a bigger size for the array.
B) the array must be "grown" using the growArray method.
C) it automatically resizes to accommodate new elements.
D) the array must be "grown" using the new command and the copyOf method.

Question 24

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

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

Question 25

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

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 26

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

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

Question 27

Which code snippet finds the largest value in an array that is only partially full?

A) double largest = values[0];
For (int i = 1; i < values.length; i++)
{
If (values[i] > largest)
{
Largest = values[i];
}
}
B) double largest = values[0];
For (int i = 1; i < values.length; i++)
{
If (values[i] < largest)
{
Largest = values[i];
}
}
C) double largest = values[0];
For (int i = 1; i < currSize; i++)
{
If (values[i] > largest)
{
Largest = values[i];
}
}
D) double largest = values[0];
For (int i = 1; i < currSize; i++)
{
If (values[i] < largest)
{
Largest = values[i];
}
}

Question 28

What is the value of the count variable after the execution of the given code snippet?
ArrayList num = new ArrayList();
Num)add(1);
Num)add(2);
Num)add(1);
Int count = 0;
For (int i = 0; i < num.size(); i++)
{
If (num.get(i) % 2 == 0)
{
Count++;
}
}

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

Question 29

The binary search is faster than the linear search, providing

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 30

Babbage's machine for automatically producing printed tables was called

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

Question 31

When a Java program terminates and reports an exception, the error message contains which pieces of useful information?
I) The compile and revision control history of the source code changes that caused the error
II) The name of the exception that occurred
III) The stack trace

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

Question 32

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

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

Question 33

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

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 34

Java 7 introduced enhanced syntax for declaring array lists, which is termed

A) angle brackets.
B) method lists.
C) diamond syntax.
D) symmetric slants.

Question 35

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

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

Question 36

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

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 37

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?

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

Question 38

Consider the telephone book as a physical object that can help understand algorithms. What kind of algorithm might be visualized using it?

A) Sorting
B) Searching
C) Finding the maximum
D) Monte Carlo methods

Question 39

Which code snippet calculates the sum of all the elements in even positions in an array?

A) int sum = 0;
For (int i = 1; i < values.length; i+=2)
{
Sum++;
}
B) int sum = 0;
For (int i = 0; i < values.length; i++)
{
Sum++;
}
C) int sum = 0;
For (int i = 0; i < values.length; i++)
{
Sum += values[i];
}
D) int sum = 0;
For (int i = 0; i < values.length; i + 2)
{
Sum += values[i];
}

Question 40

Which code snippet calculates the sum of all the even elements in an array values?

A) int sum = 0;
For (int i = 0; i < values.length; i++)
{
If ((values[i] % 2) == 0)
{
Sum += values[i];
}
}
B) int sum = 0;
For (int i = 0; i < values.length; i++)
{
If ((values[i] % 2) == 0)
{
Sum++;
}
}
C) int sum = 0;
For (int i = 0; i < values.length; i++)
{
If ((values[i] / 2) == 0)
{
Sum += values[i];
}
}
D) int sum = 0;
For (int i = 0; i < values.length; i++)
{
If ((values[i] / 2) == 0)
{
Sum++;
}
}

Question 41

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?

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 42

Consider the following code snippet:
Int cnt = 0;
Int[][] numarray = new int[2][3];
For (int i = 0; i < 3; i++)
{
For (int j = 0; j < 2; j++)
{
Numarray[j][i] = cnt;
Cnt++;
}
}
What is the value of numarray[1][2] after the code snippet is executed?

A) 2
B) 5
C) 3
D) 4

Question 43

Consider the following code snippet in Java 6 or later:
String[] data = { "abc", "def", "ghi", "jkl" };
String[] data2 = Arrays.copyOf(data, data.length - 1);
What does the last element of data2 contain?

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

Question 44

Consider the following method:
Public static int mystery(int length, int n)
{
Int[] result = new int[length];
For (int i = 0; i < result.length; i++)
{
Result[i] = (int) (n * Math.random());
}
Return result;
}
Which statement is correct about the code?

A) The method works perfectly
B) The method returns a random number
C) The method return type should be changed to int[]
D) The method has a bounds error when the array size is too large

Question 45

What is the output of the following code snippet?
Public static void main(String[] args)
{
String[] arr = { "aaa", "bbb", "ccc" };
Mystery(arr);
System.out.println(arr[0] + " " + arr.length);
}
Public static void mystery(String[] arr)
{
Arr = new String[5];
Arr[0] = "ddd";
}

A) ddd 5
B) ddd 3
C) aaa 5
D) aaa 3

Question 46

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

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 47

Consider the following code snippet. Which statement should be used to fill in the empty line so that provides the output will be [32, 54, 67.5, 29, 35]?
Public static void main(String[] args)
{
Double data[] = {32, 54, 67.5, 29, 35};
______________
System.out.println(str);
}

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

Question 48

Select the statement that reveals the logic error in the following method.
Public static double minimum(double[] data)
{
Double smallest = 0.0;
For (int i = 0; i < data.length; i++)
{
If (data[i] < smallest)
{
Smallest = data[i];
}
}
Return smallest;
}

A) double m = minimum(new double[] { 1.2, -3.5, 6.6, 2.4 });
B) double m = minimum(new double[] { 1.2, 23.5, 16.6, -23.4 });
C) double m = minimum(new double[] { -10.2, 3.5, 62.6, 21.4 });
D) double m = minimum(new double[] { 12.2, 31.5, 6.6, 2.4 });

Question 49

Which one of the following statements is true about passing arrays to a method?

A) By default, arrays are passed by value to a method
B) Arrays, when updated in a called method, are not reflected to the calling method
C) By default, arrays are passed by reference to a method
D) Arrays are passed only if size is specified as another argument

Question 50

Which one of the following is the correct header for a method named arrMeth that is called like this:
ArrMeth(intArray); // intArray is an integer array of size 3

A) public static void arrMeth(int[] ar, int n)
B) public static void arrMeth(r[], n)
C) public static void arrMeth(int n , int[] ar)
D) public static void arrMeth(int[] ar)

Question 51

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

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

Question 52

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

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 53

Consider the following code snippet:
Int[][] numarray =
{
{ 3, 2, 3 },
{ 0, 0, 0 }
};
System.out.print(numarray[0][0]);
System.out.print(numarray[1][0]);
What is the output of the given code snippet?

A) 00
B) 31
C) 30
D) 03

Question 54

Consider the following code snippet:
String[] data = { "abc", "def", "ghi", "jkl" };
String [] data2;
In Java 6 and later, which statement copies the data array to the data2 array?

A) data2 = Arrays.copyOf(data, data2.length);
B) data2 = Arrays.copyOf(data, data.length);
C) data2 = Arrays.copyOf(data, data.size());
D) data2 = Arrays.copyOf(data);

Question 55

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

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

Question 56

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?

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 57

Is there any thing wrong with the following code snippet?
String[] data = { "abc", "def", "ghi", "jkl" };
String searchedValue = "ghi";
Int pos = 0;
Boolean found = false;
While (pos < data.length)
{
If (data[pos].equals(searchedValue))
{
Found = true;
}
Else
{
Found = false;
}
Pos++;
}
If (found)
{
System.out.println("Found at position: " + pos);
}
Else
{
System.out.println("Not found");
}

A) There is nothing wrong.
B) There is compile-time error.
C) There is a bounds error.
D) There is a logic error.

Question 58

Which one of the following is the correct definition for initializing data in a two-dimensional array of three rows and two columns?

A) int[][] arr =
{
{ 1, 1, 1 },
{ 2, 2, 2 },
};
B) int[][] arr =
{
{ 1, 1 },
{ 2, 2 },
{ 3, 3 }
};
C) int[][] arr =
{
{ 1, 1 }
{ 2, 2 }
{ 3, 3 }
};
D) int[][] arr =
{
{ 1, 1, 1 }
{ 2, 2, 2 }
{ 3, 3, 3 }
};

Question 59

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?

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 60

Consider the following 2-dimensional array. Select the statement that gives the number of columns in the third row.
Int[][] counts =
{
{ 0, 0, 1 },
{ 0, 1, 1, 2 },
{ 0, 0, 1, 4, 5 },
{ 0, 2 }
};

A) int cols = counts[2].size();
B) int cols = counts.length[2];
C) int cols = counts.length;
D) int cols = counts[2].length;

Question 61

Consider the following code snippet:
ArrayList arrList = new ArrayList();
For (int i = 0; i < arrList.size(); i++)
{
ArrList.add(i + 3);
}
What value is stored in the element of the array list at index 0?

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

Question 62

Consider the following code snippet:
ArrayList somedata = new ArrayList();
Somedata.add(10.5);
What is the size of the array list somedata after the given code snippet is executed?

A) 0
B) 1
C) 10
D) 2

Question 63

Your program needs to store a sequence of integers of unknown length. Which of the following is most suitable to use?

A) An array declared as int[] marks;
B) A array list declared as ArrayList marks = new ArrayList();
C) An array declared as int marks[10000];
D) An array declared as int marks[10];

Question 64

What is the value of the cnt variable after the execution of the code snippet below?
ArrayList somenum = new ArrayList();
Somenum.add(1);
Somenum.add(2);
Somenum.add(1);
Int cnt = 0;
For (int index = 0; index < somenum.size(); index++)
{
If (somenum.get(index) % 2 == 0)
{
Cnt++;
}
}

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

Question 65

What is the result of the following definition of an array list?
ArrayList points;

A) The statement causes a compile time error as the size of the array list is not defined.
B) The statement creates an array list of size 0.
C) The statement creates an array list with unlimited size.
D) The statement defines an array list reference but leaves its value as null.

Question 66

Consider the following code snippet:
Public static void check(ArrayList chknum1)
{
Int cnt = 0;
For(int i = 0; i < chknum1.size(); i++)
{
If(chknum1.get(i) == 0)
{
Cnt++;
}
}
System.out.println("The total 0 values in the list are: " + cnt);
}
Which one of the following is true about the check method in the given code snippet?

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 67

Consider the following line of code for calling a method named func1:
Func1(listData, varData);
Which one of the following method headers is valid for func1, where listData is an integer array list and varData is an integer variable?

A) public static void func1(int[] listData, int varData)
B) public static void func1(ArrayList listData, varData)
C) public static void func1(ArrayList ldata, int vdata)
D) public static void func1(int vdata, ArrayList ldata)

Question 68

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++;
}
}

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

Question 69

Consider the following code snippet:
Int[][] arr =
{
{ 1, 2, 3 },
{ 4, 5, 6 }
};
Int val = arr[0][2] + arr[1][2];
System.out.println(val);
What is the output of the given code snippet on execution?

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

Question 70

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

A) int maximum = 0;
For (int counter = 1; counter < arrList.size(); counter++)
{
If (arrList.get(counter) > maximum)
{
Maximum = arrList.get(counter);
}
}
B) int maximum = arrList.get(0);
For (int counter = 1; counter < arrList.size(); counter++)
{
If (arrList.get(counter) > maximum)
{
Maximum = arrList.get(counter);
}
}
C) int maximum = arrList.get(1);
For (int counter = 1; counter < arrList.size(); counter++)
{
If (arrList.get(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 71

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

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

Question 72

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?

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 73

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

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 74

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?

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 75

Which one of the following statements about declaring an array list as a method parameter is true?

A) An array list declared as a method parameter should be accompanied with its size.
B) An array list declared as a method parameter is a constant value by default.
C) An array list value cannot be modified in a method when the array list is declared as a parameter.
D) An array list value can be modified inside the method.

Question 76

Which one of the following is a valid signature of a method with an integer two-dimensional array parameter of size 10 x 10?

A) public static void func(int[][] arr)
B) public static void func(int[10][] arr)
C) public static void func(int[][10] arr)
D) public static void func(int[10][10] arr)

Question 77

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

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

Question 78

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?

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 79

What is the output of the following code snippet?
Public static int check(ArrayList listData)
{
Int sum = 0;
For (int i = 0; i < listData.size(); i++)
{
Sum = sum + listData.get(i);
}
Return sum;
}
Public static void main(String[] args)
{
ArrayList vdata = new ArrayList();
Int rsum;
For (int cnt = 0; cnt < 3; cnt++)
{
Vdata.add(cnt + 1);
}
Rsum = check(vdata);
System.out.println(rsum);
}

A) 4
B) 2
C) 3
D) 6

Question 80

Consider the following code snippet:
ArrayList num1 = new ArrayList();
Int data;
Scanner in = new Scanner(System.in);
For (int i = 0; i < 5; i++)
{
Data = in.nextInt();
Num1.add(data);
If (data == 0 && num1.size() > 3)
{
Num1.remove(num1.size() - 1);
}
}
System.out.println("size is : " + num1.size());
What is the output of the given code snippet if the user enters 1,2,0,0,1 as the input?

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