How do I rotate an array in Java?

How do I rotate an array in Java?

You can rotate an array in Java by using a temporary array or by reversing parts of the array. Which method would you like to know more about?

Can you explain the reversing method?

Sure! To rotate an array using the reversing method, you can follow these steps: 1) Reverse the entire array, 2) Reverse the first 'k' elements, and 3) Reverse the remaining elements.

What is the time complexity of this method?

The time complexity of the reversing method is O(n), where n is the number of elements in the array, since each element is reversed at most twice.

Can you provide a code example?

Absolutely! Here's a simple code snippet:

public void rotate(int[] nums, int k) {
    k = k % nums.length;
    reverse(nums, 0, nums.length - 1);
    reverse(nums, 0, k - 1);
    reverse(nums, k, nums.length - 1);
}

private void reverse(int[] nums, int start, int end) {
    while (start < end) {
        int temp = nums[start];
        nums[start] = nums[end];
        nums[end] = temp;
        start++;
        end--;
    }
}

This will rotate the array to the right by k steps.