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For example, I have a class that says

public class KeyList extends Vector<Object> {
}

but it never specifically creates a new Vector of any kind. This is part of an implementation of Eliza that I found online

extends means that KeyList is-a Vector. It does not (necessarily) mean that KeyList has-a Vector.

See The Java Tutorial for more, specifically What Is Inheritance? and the Inheritance section.

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2 回答 2

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extends表示KeyList is-a Vector。它并不（必然）意味着KeyList has-a Vector。

有关更多信息，请参阅 Java 教程，特别是什么是继承？和继承部分。

于 2013-10-28T17:54:36.080 回答
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It is about inheritance: meaning that KeyList is a subclass of Vector<Object>. Essentially it means that KeyList is a modified Vector<Object> in itself. For more information, you should read Oracle's docs on inheritance.

于 2013-10-28T17:55:53.437 回答