Recursion and backtracking in Java

public void backtrack(int[] nums, int start, List<Integer> path, List<List<Integer>> result) {
    result.add(new ArrayList<>(path));

    for (int i = start; i < nums.length; i++) {
        path.add(nums[i]);
        backtrack(nums, i + 1, path, result);
        path.remove(path.size() - 1);
    }
}