数组/List集合判断是否有交集--retainAll()

1.数组转为List集合

      Arrays.asList(postCodeOld.split(","))

2.List集合转为HashSet集合

            HashSet<String> set = new HashSet<String>(Arrays.asList(postCodeOld.split(",")));

3.

      HashSet<String> set = new HashSet<String>(Arrays.asList(postCodeOld.split(",")));

4.判断

     set.retainAll(Arrays.asList(postCodeNew.split(",")));

     if(set.size() !=  0){
         result =  false;
     }

源码: