some common array-related interview questions in Java

Category : Java | Sub Category : Java Programs | By Prasad Bonam Last updated: 2023-08-14 12:42:23 Viewed : 529

some common array-related interview questions in Java:

Here are some Java array-related interview questions along with their solutions and corresponding outputs:

1. Find the maximum element in an array:

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public class MaxElementInArray {
    public static void main(String[] args) {
        int[] array = {10, 7, 23, 45, 87, 13};
        int max = array[0];

        for (int num : array) {
            if (num > max) {
                max = num;
            }
        }

        System.out.println("Maximum element: " + max);
    }
}

Output:

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Maximum element: 87

2. Find the second largest element in an array:

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public class SecondLargestInArray {
    public static void main(String[] args) {
        int[] array = {10, 7, 23, 45, 87, 13};
        int max = Integer.MIN_VALUE;
        int secondMax = Integer.MIN_VALUE;

        for (int num : array) {
            if (num > max) {
                secondMax = max;
                max = num;
            } else if (num > secondMax && num != max) {
                secondMax = num;
            }
        }

        System.out.println("Second largest element: " + secondMax);
    }
}

Output:

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Second largest element: 45

3. Find the common elements in two arrays:

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import java.util.HashSet;
import java.util.Set;

public class CommonElementsInArrays {
    public static void main(String[] args) {
        int[] array1 = {1, 2, 3, 4, 5};
        int[] array2 = {3, 5, 6, 7, 8};

        Set<Integer> commonElements = new HashSet<>();

        for (int num : array1) {
            commonElements.add(num);
        }

        for (int num : array2) {
            if (commonElements.contains(num)) {
                System.out.println("Common element: " + num);
            }
        }
    }
}

Output:

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Common element: 3
Common element: 5

4. Rotate an array to the right by K positions:

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public class RotateArray {
    public static void main(String[] args) {
        int[] array = {1, 2, 3, 4, 5};
        int k = 2;

        int n = array.length;
        k = k % n;

        int[] rotatedArray = new int[n];

        for (int i = 0; i < n; i++) {
            rotatedArray[(i + k) % n] = array[i];
        }

        System.out.println("Rotated array:");
        for (int num : rotatedArray) {
            System.out.print(num + " ");
        }
    }
}

Output:

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Rotated array:
4 5 1 2 3

These examples demonstrate different array manipulation techniques commonly asked in interviews. The outputs correspond to the provided input arrays and problem statements.