What Does the Ellipsis (...) Mean in App Engine Method Signatures?

Ellipsis Usage in App Engine Method Signatures

In the App Engine documentation, an ellipsis (JID...) is encountered in a method signature like:

public MessageBuilder withRecipientJids(JID... recipientJids)

This notation represents Java varargs (variable arguments). It allows for passing any quantity of objects of a specified type, in this case JIDs.

For example, the following method calls are valid:

MessageBuilder msgBuilder; //Constructor call omitted for simplicity
MessageBuilder msgBuilder2;

msgBuilder.withRecipientJids(jid1, jid2);
msgBuilder2.withRecipientJids(jid1, jid2, jid78_a, someOtherJid);

These calls pass two and four JIDs to the method, respectively.

Java varargs provide a convenient way to work with an arbitrary number of arguments, allowing for flexibility and ease of use in method calls.

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