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输出结果如下-----------第一种方式----------- aa-11 bb-22 cc-33 dd-44 ee-55 -----------第二种方式----------- aa-11 bb-22 cc-33 dd-44 ee-55 ----取出所有的value 使用增强for---- 1...

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Map集合现实生活中，我们常会看到这样的一种集合：IP地址与主机名，等，这种一一对应的关系，就叫做映射。Java提供了专门的集合类用来存放这种对象关系的对象，即java.util.Map接口。Collection`中的集合，元素是孤立存在的（理解为单身）ÿ...

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文章目录HashMap类LinkedHashMap类TreeMap类Hashtable类Properties类HashMap类1、HashMap类概述HashMap是 Map 接口使用频率最高的实现类，允许使用null键和null值，与HashSet一样，不保证映射的顺序。所有的key构成的集合是S...

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