Set<String>

Set<String> 是一个集合类型，它有一些特性。首先，Set中不会出现重复的元素，每个元素只会出现一次。其次，Set是无序的，元素的顺序不会按照添加的顺序来排列。此外，Set可以包含空元素。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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