Concatenation of Array LeetCode solution in Java

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class Solution {
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  public int[] getConcatenation(int[] nums) {
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    int[] ans = new int[2 * nums.length];
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    for (int i = 0; i < nums.length; i++) {
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      ans[i] = ans[i + nums.length] = nums[i];
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    }
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    return ans;
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  }
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}