Differences among list,set and map
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1, list 允许重复值， set 和map的健值是唯一的
2，list是有序的，set和map是无序的, linkedHashMap是有序的
3，Arraylist 和VECTOR是数组实现的，随机查找快。 LinkedList是双链表的, 随机插入快
4, vector是线程安全的
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