Rotate Array in Java: Explanation & Practice

Problem summary

Write a program that rotates array elements by k positions to the right.

Starter code

public class Main {
    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 4, 5};
        int k = 2; // Test case 1
        
        // Rotate right by k positions
        // Print space-separated
    }
}

Expected output and test cases

• Rotate right by 2

  4 5 1 2 3

• Rotate right by 1

  5 1 2 3 4

• Rotate by 5 (full circle)

  1 2 3 4 5

Hints

1. k % length handles k > length
2. Reverse entire array, then reverse parts
3. Or use extra array for simpler solution

Related Arrays exercises

• Practice Second Largest Element in Java
• Practice Remove Duplicates in Java
• Practice Merge Sorted Arrays in Java

Practice all Arrays exercises · Run this idea in the Java compiler