Java: Rotate an array of integers in left direction

Last update on May 12 2025 13:17:21 (UTC/GMT +8 hours)

Rotate Array Left

Write a Java program to rotate an array (length 3) of integers in the left direction.
Test Data: {20, 30, 40}
Expected output: {30, 40, 20}

Sample Solution:

Java Code:

import java.util.Arrays;

public class Exercise79 {
    public static void main(String[] args) {
        // Define an integer array, array_nums
        int[] array_nums = {20, 30, 40};
        
        // Print the elements of the original array
        System.out.println("Original Array: " + Arrays.toString(array_nums)); 
        
        // Create a new array by rotating the elements of the original array
        int[] new_array_nums = {array_nums[1], array_nums[2], array_nums[0]};
        
        // Print the elements of the rotated array
        System.out.println("Rotated Array: " + Arrays.toString(new_array_nums)); 
    }
}

Sample Output:

Original Array: [20, 30, 40]                                           
Rotated Array: [30, 40, 20] 

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Modify the program to rotate an array to the right instead of left.
• Write a program to rotate an array N times, where N is provided by the user.
• Modify the program to reverse an array instead of rotating it.
• Write a program to shift an array's elements by one place while preserving order.

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