hashmap存空值

HashMap可以存储空值。根据引用的内容，HashMap的key和value都可以为null。也就是说，你可以将null作为HashMap的key或者value存储进去。但需要注意的是，为null的key只能有一个，而为null的value可以有多个。如果你给多个key都赋值null，最终也只会有一个key存储进来。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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