How to Rotate Elements in an Array in Java - Step by Step Examples

How to Rotate Elements in an Array in Java ?

Answer

To rotate elements in an array using Java, you can implement a custom rotation function that shifts elements by a specified number of positions.

✐ Examples

1 Rotate Array of Integers

In this example,

We have an array named intArray containing integers.
We implement a custom rotate function that shifts elements by a specified number of positions.
We print the rotated array to demonstrate the rotation.

Java Program

import java.util.Arrays;

// Rotate Array of Integers
public class Main {
    public static void main(String[] args) {
        int[] intArray = {1, 2, 3, 4, 5};
        rotate(intArray, 2);
        System.out.println("Rotated Array: " + Arrays.toString(intArray));
    }

    public static void rotate(int[] array, int positions) {
        int n = array.length;
        positions %= n;
        reverse(array, 0, n - 1);
        reverse(array, 0, positions - 1);
        reverse(array, positions, n - 1);
    }

    public static void reverse(int[] array, int start, int end) {
        while (start < end) {
            int temp = array[start];
            array[start] = array[end];
            array[end] = temp;
            start++;
            end--;
        }
    }
}

Output

Rotated Array: [4, 5, 1, 2, 3]

2 Rotate Array of Strings

In this example,

We have an array named strArray containing strings.
We implement a custom rotate function that shifts elements by a specified number of positions.
We print the rotated array to demonstrate the rotation.

Java Program

import java.util.Arrays;

// Rotate Array of Strings
public class Main {
    public static void main(String[] args) {
        String[] strArray = {"apple", "banana", "cherry", "date", "fig"};
        rotate(strArray, 3);
        System.out.println("Rotated Array: " + Arrays.toString(strArray));
    }

    public static void rotate(String[] array, int positions) {
        int n = array.length;
        positions %= n;
        reverse(array, 0, n - 1);
        reverse(array, 0, positions - 1);
        reverse(array, positions, n - 1);
    }

    public static void reverse(String[] array, int start, int end) {
        while (start < end) {
            String temp = array[start];
            array[start] = array[end];
            array[end] = temp;
            start++;
            end--;
        }
    }
}

Output

Rotated Array: [cherry, date, fig, apple, banana]

Summary

In this tutorial, we learned How to Rotate Elements in an Array in Java language with well detailed examples.

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How to Rotate Elements in an Array in Java - Step by Step Examples

How to Rotate Elements in an Array in Java ?

Answer

✐ Examples

1 Rotate Array of Integers

Java Program

Output

2 Rotate Array of Strings

Java Program

Output

Summary

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