Concatenation of Array

Given an integer array nums of length n, you want to create an array ans of length 2n where ans[i] == nums[i] and ans[i + n] == nums[i] for 0 <= i < n (0-indexed).

Specifically, ans is the concatenation of two nums arrays.

Return the array ans.

LeetCode Problem - 1929

class Solution {
    // This method takes an array of integers as input and returns a new array that is the concatenation of the input array with itself.
    public int[] getConcatenation(int[] nums) {
        // Get the length of the input array.
        int n = nums.length;
        // Create a new array with double the length of the input array.
        int[] ans = new int[2*n];

        // Iterate through the input array.
        for(int i=0; i<n; i++){
            // Copy each element of the input array to the corresponding position in the new array.
            ans[i] = nums[i];
            // Copy each element of the input array to the second half of the new array.
            ans[i+n] = nums[i];
        }
        // Return the concatenated array.
        return ans;
    }
}