Guava: Google Core Libraries for Java

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more!

Guava comes in two flavors.

• The main flavor requires JDK 1.8 or higher.
• If you need support for JDK 1.7 or Android, use the Android flavor. You can find the Android Guava source in the android directory.

Latest release

The most recent release is Guava 23.0, released August 4, 2017.

• 23.0 API Docs: guava, guava-testlib
• 23.0 API Diffs from 22.0: guava

The Maven group ID is com.google.guava, and the artifact ID is guava. Use version 23.0 for the main flavor, or 23.0-android for the Android flavor.

To add a dependency on Guava using Maven, use the following:

<dependency>
  <groupId>com.google.guava</groupId>
  <artifactId>guava</artifactId>
  <version>23.0</version>
  <!-- or, for Android: -->
  <version>23.0-android</version>
</dependency>

To add a dependency using Gradle:

dependencies {
  compile 'com.google.guava:guava:23.0'
  // or, for Android:
  compile 'com.google.guava:guava:23.0-android'
}

Snapshots

Snapshots of Guava built from the master branch are available through Maven using version 24.0-SNAPSHOT, or 24.0-android-SNAPSHOT for the Android flavor.

• Snapshot API Docs: guava
• Snapshot API Diffs from 22.0: guava

Learn about Guava

• Our users' guide, Guava Explained
• A nice collection of other helpful links

Links

• GitHub project
• Issue tracker: Report a defect or feature request
• StackOverflow: Ask "how-to" and "why-didn't-it-work" questions
• guava-discuss: For open-ended questions and discussion

IMPORTANT WARNINGS

1. 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, at any time. 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).

2. Deprecated non-beta APIs will be removed two years after the release in which they are first deprecated. You must fix your references before this time. If you don't, any manner of breakage could result (you are not guaranteed a compilation error).

3. Serialized forms of ALL objects are subject to change unless noted otherwise. Do not persist these and assume they can be read by a future version of the library.

4. Our classes are not designed to protect against a malicious caller. You should not use them for communication between trusted and untrusted code.

5. For the mainline flavor, we unit-test the libraries using only OpenJDK 1.8 on Linux. Some features, especially in com.google.common.io, may not work correctly in other environments.

For the Android flavor, our unit tests run on API level 10 (Gingerbread).