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更多信息:HashMap vs. TreeMap vs. Hashtable vs. LinkedHashMap Top 10 questions about Map 使用集合原始类型(raw type) 在Java中,原始类型(raw type)和无界通配符类型很容易让人混淆。 举个Set的例子,Set是原始类型,而Set是无界通配符类型。
HashMap vs. Hashtable similarities Both the Hashtable and HashMap implement the Map interface and both share the same set of methods used to add, remove and manipulate elements of a key-value, ...