算法：去除数组重复内容

 

private String[] filtrate(String[] input) {
       Set set = new HashSet();
       set.addAll(Arrays.asList(input));
       String[] arr = (String[]) set.toArray(new String[0]);
       String[] result = new String[arr.length];
       for (int i = 0; i < arr.length; i++) {
           result[i] = arr[i];
       }
       return result;
    }