此方法签名中的省略号 (...) 是什么? [英] What is the ellipsis (...) for in this method signature?

问题描述

在 App Engine 中docs，此方法签名中的省略号 (JID...) 是什么?

In the App Engine docs, what is the ellipsis (JID...) for in this method signature?

public MessageBuilder withRecipientJids(JID... recipientJids)

这三个点的作用是什么?

What's the function of those three dots?

推荐答案

那些是 Java 可变参数.它们允许您传递任意数量的特定类型的对象(在本例中它们是 JID 类型).

Those are Java varargs. They let you pass any number of objects of a specific type (in this case they are of type JID).

在您的示例中，以下函数调用是有效的:

In your example, the following function calls would be valid:

MessageBuilder msgBuilder; //There should probably be a call to a constructor here ;)
MessageBuilder msgBuilder2;
msgBuilder.withRecipientJids(jid1, jid2);
msgBuilder2.withRecipientJids(jid1, jid2, jid78_a, someOtherJid);

在此处查看更多信息:http://java.sun.com/j2se/1.5.0/docs/guide/language/varargs.html

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