Java Arrays Quiz

What is an array in Java?

• A collection of elements of different types

• A collection of elements of the same type

• A class in Java

• None of the above

How are arrays declared in Java?

• int arr = new int[5];

• int[] arr = new int[5];

• int arr = {1, 2, 3};

• array int[5] arr;

What will happen if you access an array index out of bounds?

• Compilation error

• Returns -1

• Runtime exception

• Undefined behavior

How do you get the length of an array in Java?

• arr.size()

• arr.length

• arr.length()

• arr.getLength()

Which of the following initializes an array correctly?

• int[] arr = new int[5]{1, 2, 3, 4, 5};

• int arr = {1, 2, 3, 4, 5};

• int arr[] = {1, 2, 3, 4, 5};

• int arr(5) = {1, 2, 3, 4, 5};

Can an array size be changed after declaration in Java?

• Yes

• No

• Only for primitive types

• Only for object types

How do you declare a multidimensional array in Java?

• int[][] arr = new int[3][3];

• int arr[][] = {1, 2, 3, 4};

• int[] arr = new int[3][3];

• array[][]int arr;

Given an array int[] arr = {3, 5, 7, 9};, how would you access the second element?

• arr[0]

• arr[1]

• arr[2]

• arr[3]

If int[] nums = {1, 2, 3, 4, 5};, what will System.out.println(nums[nums.length - 1]); output?

• 1

• 4

• 5

• ArrayIndexOutOfBoundsException

Write the output of the following code snippet: int[] arr = {2, 4, 6, 8}; for (int i = 1; i < arr.length; i++) { System.out.print(arr[i] + " "); }

• 2 4 6 8

• 2 4 6

• 4 6 8

• Compilation Error