最全面的Java中List集合去除重複數據的方法

1. 循環list中的所有元素然後

public   static   List  removeDuplicate(List list)  {       
  for  ( int  i  =   0 ; i  <  list.size()  -   1 ; i ++ )  {       
      for  ( int  j  =  list.size()  -   1 ; j  >  i; j -- )  {       
           if  (list.get(j).equals(list.get(i)))  {       
              list.remove(j);       
            }        
        }        
      }        
    return list;       
}

2. 通過HashSet踢除重複元素

public static List removeDuplicate(List list) {   
    HashSet h = new HashSet(list);   
    list.clear();   
    list.addAll(h);   
    return list;   
}

3.採用java8語法

 List<String> unique = list.stream().collect(
                Collectors.collectingAndThen(
                        Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(String::toString))), ArrayList::new)
        );
        unique.forEach(System.out::println);

參考：https://blog.csdn.net/ianly123/article/details/82658622