Google前日开源了其内部Java项目所用的Java库，并取名为Guava库（guava是番石榴的意思）。Guava库旨在提供核心JDK 1.6 API所没有的常用功能。Guava包括三个包：
以后还会发布更多的库。除了JDK 1.6，Guava库还可以在Android和Google App Engine等其他Java平台上使用。
The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.
The latest release is 14.0.1, released March 15, 2013.
You can download a JAR at:
Guava is also available in Maven Central under the following identifiers:
Learn more about how to UseGuavaInYourBuild.
Please see the 14.0.1 release notes for more details about this release.
To stay informed and get "tip of the week"-style posts, follow +Google Guava on Google+.
To just stay informed, period, about important news that every Guava user needs to know, subscribe to guava-announce. It is very low-traffic.
To report a defect or request a feature, click the Issues tab above and enter a new issue.
Keep an eye on project updates using any of these Project Feeds. (The "Updates" feed is an aggregation of all the others.) You can view our code changes as they happen, and comment on them using the code-review tool.
We have a read-only mailing list consisting of email notifications of issue tracker activity, which can be easier to follow in a threaded manner than the project feed.
For general discussion that doesn't fit neatly into any of these categories, join our discussion group guava-discuss.
Guava contains a strictly compatible superset of the old, deprecated Google Collections Library. You should not use that library anymore.
APIs marked with the @Beta annotation at the class or method level are subject to change. They can be modified in any way, or even removed, in any major release. If your code is a library itself (i.e. it is used on the CLASSPATH of users outside your own control), you should not use beta APIs, unless you repackage them (e.g. using ProGuard). Here is a current list of all the beta APIs.
Serialized forms of ALL objects are subject to change. Do not persist these and assume they can be read by a future version of the library.
Deprecated non-beta APIs will be removed eighteen months after the release in which they are first deprecated. You must fix your usages before this time. If you don't, any manner of breakage might result (you are not guaranteed a compilation error).
The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth. Each of these tools really do get used every day by Googlers, in production services.
But trawling through Javadoc isn't always the most effective way to learn how to make best use of a library. Here, we try to provide readable and pleasant explanations of some of the most popular and most powerful features of Guava.
This wiki is a work in progress, and parts of it may still be under construction.