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collectionreview's Introduction

java 集合类复习总结
Map 键值对
Map 
	HashMap TreeMap
Collection 集合类
	List 有序列表集合
	Set 不重复的元素集合 

List 
	ArrayList LinkedList Vector Stack
Set
	HashSet TreeSet

Collection重点：
1.集合的创建，对应集合实现类的构造器在构造方法中集合的实现类都做了什么操作
2.往集合中增加对象
3.删除集合中的对象
4.获取集合中的单个对象
5.遍历集合中的对象
6.判断对象是否存在于集合中
7.集合中对象的排序

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