可以用set,如果最终非要用list来存的话,可以先添加到set再添到list: 例: Collection list = new ArrayList(); list.add("hello1"); list.add("hello2"); list.add("hello2"); list.add("hello3"); Collection set = new HashSet(); set.addAll(list); System.out.println(list); Collection list2 = new ArrayList(); list2.addAll(set); System.out.println(list2);
例:
Collection list = new ArrayList();
list.add("hello1");
list.add("hello2");
list.add("hello2");
list.add("hello3");
Collection set = new HashSet();
set.addAll(list);
System.out.println(list);
Collection list2 = new ArrayList();
list2.addAll(set);
System.out.println(list2);