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今天来看看Java集合中的Map集合，为什么Map集合中元素不能重复？为什么Map集合有时是有序的有时是无序的？我们来共同交流交流存储形式是什么样的？键值对容器类：HashMap、hashtable、TreeMapHashMap有哪些特征呢？value可以重复，key不能重复（如果新添...

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java读源码之 map源码分析（HashMap）二

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java读源码之 map源码分析（HashMap，图解）一

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Java集合相关学习——手写一个简单的Map接口实现类（HashMap）

1.关于Map和HashMap这两个东西想必大家都很熟悉了，简单的概括就是：面试中会问到、笔试中会考到、开发中会用到。那么有关这块知识呢，大家可以参考我的这几篇文章：HashMap常用方法举例HashMap源码剖析Java集合相关面试题 2.案例代码要求是这样的：请完善TestMap类，要求只实现g...

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【JAVA百炼成仙】渡劫篇下——Map集合（HashMap、TreeMap）

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在Java中，Set的底层事实上是基于Map实现的，Map内部封装了一个Entry内部接口，由实现类来封装key-value对，当value值均为null时，key的集合就形成了Set。因此，Map集合具有如下的一些特点： 1. Key集因为是Set的实现，因此是无顺序、不可重复的。 2. Valu...

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Java Map&HashMap

Map接口 1. Map接口提供了一中映射关系，其中的元素是键值对（key-value）的形式存储的，能够实现根据Key快速查找value。Key-value可以是任何对象，是以Entry类型的对象实例存在的。 2.Key是不可以重复的，Value是可以重复的。Key-value都可以为null，不...

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