Java Arrays

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    Question 1

    Which of the following is the correct way to declare an array in Java?


    • int arr[5];

    • int arr = new int(5);

    • int[] arr = new int[5];

    • array<int> arr = new int[5];

    Question 2

    What will be the output of the following code?

    Java 
    int[] arr = {1, 2, 3, 4, 5};
System.out.println(arr[2]);

    • 1

    • 2

    • 3

    • 4

    Question 3

    What is the default value of an integer array in Java?


    • null

    • 0

    • garbage value


    • depends on JVM

    Question 4

    Which of the following is used to determine the length of an array in Java?

    • arr.length();

    • arr.size;

    • arr.length;

    • arr.count();

    Question 5

    What is the time complexity for accessing an element in an array by index?

    • O(1)

    • O(n)

    • O(log n)

    • O(n^2)

    Question 6

    Which of the following creates an array of 5 integers?

    • int arr[] = new int[5];

    • int arr[5];

    • int arr() = 5;

    • int[5] arr;


    Question 7

    How do you access the third element of an array arr?


    • arr(3)

    • arr[3]

    • arr[2]

    • arr{3}

    Question 8

    How many rows and columns are in a 2D array int[][] arr = new int[3][4];?


    • 3 rows, 4 columns

    • 4 rows, 3 columns


    • 3 elements

    • 7 elements

    Question 9

    Which of these best defines a multidimensional array in Java?


    • int arr[][]


    • int[] arr[]


    • Both a and b

    • int arr(2)(3)

    There are 9 questions to complete.

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