intersection of two arrays

class  {
    public int[] intersection(int[] nums1, int[] nums2) {
        List<Integer> list = new ArrayList<>();
        for(int i=0; i<nums1.length;i++) {
             if(!list.contains(nums1[i])) {
                 list.add(nums1[i]);
             }
        }
        List<Integer> result = new ArrayList<>();
        for(int i=0; i<nums2.length; i++) {
            if(list.contains(nums2[i]) && !result.contains(nums2[i])) {
                result.add(nums2[i]);
            }
        }
        int[] re = new int[result.size()];
        for(int i=0; i<result.size(); i++) {
            re[i] = result.get(i);
        }
        return re;
    }
}