HashMap如何在内部工作 [英] How HashMap works internally

问题描述

HashMap objHashMap = new HashMap();

objHashMap.put("key1", "Value1");
objHashMap.put("key1", "Value2");

System.out.println(objHashMap.get("key1"));

上面显示Value2的代码如何以及为什么

Above code displaying "Value2" how and why

推荐答案

因为哈希映射只为每个值存储唯一的键，这意味着你不能把两个相同名称的键，当你将覆盖值这个键，所以如果你想存储2个不同的值，你需要存储两个不同的键。

Because Hash maps store only unique keys for each value, this means that you can't put 2 keys with the same name in it, when you do you will overwrite the value for that key, so if you want to store 2 different values you need to store two different keys in it.

HashMap objHashMap = new HashMap();
objHashMap.put("key1", "Value1");
objHashMap.put("key2", "Value2"); //CHANGED THIS KEY to "key2"

System.out.println(objHashMap.get("key1"));

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