Quiz: Java Arrays

5 questionsNo time limitPass: 60%+10 XP on first pass

Declare and use arrays, loop over them, work with 2D arrays, use Arrays.sort / toString / fill, and write the classic array programs asked in interviews.

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Question 1

What does this print?

public class Main {
    public static void main(String[] args) {
        int[] a = new int[4];
        System.out.println(a[2] + a.length);
    }
}

246Error

Question 2
What is the last valid index of an array with length 10?
109111

Question 3

What does this print?

public class Main {
    public static void main(String[] args) {
        int[] a = {1, 2, 3};
        int[] b = a;
        b[0] = 9;
        System.out.println(a[0]);
    }
}

190Error

Question 4
Which prints the contents of int[] nums as [1, 2, 3]?
System.out.println(nums)System.out.println(Arrays.toString(nums))System.out.println(nums.toString())System.out.println(String(nums))
Question 5
What does grid.length give for int[][] grid = new int[3][5];?
35158