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GUAVA

Guava is a set of core Java libraries from Google that includes new collection
types (such as multimap and multiset), immutable collections, a graph library,
and utilities for concurrency, I/O, hashing, primitives, strings, and more! It
is widely used on most Java projects within Google, and widely used by many
other companies as well.

Guava comes in two flavors:

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


ADDING GUAVA TO YOUR BUILD

Guava’s Maven group ID is com.google.guava, and its artifact ID is guava. Guava
provides two different “flavors”: one for use on a (Java 8+) JRE and one for use
on Android or by any library that wants to be compatible with Android. These
flavors are specified in the Maven version field as either 32.1.3-jre or
32.1.3-android. For more about depending on Guava, see using Guava in your
build.

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

<dependency>
  <groupId>com.google.guava</groupId>
  <artifactId>guava</artifactId>
  <version>32.1.3-jre</version>
  <!-- or, for Android: -->
  <version>32.1.3-android</version>
</dependency>


To add a dependency using Gradle:

dependencies {
  // Pick one:

  // 1. Use Guava in your implementation only:
  implementation("com.google.guava:guava:32.1.3-jre")

  // 2. Use Guava types in your public API:
  api("com.google.guava:guava:32.1.3-jre")

  // 3. Android - Use Guava in your implementation only:
  implementation("com.google.guava:guava:32.1.3-android")

  // 4. Android - Use Guava types in your public API:
  api("com.google.guava:guava:32.1.3-android")
}


For more information on when to use api and when to use implementation, consult
the Gradle documentation on API and implementation separation.


SNAPSHOTS AND DOCUMENTATION

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

 * Snapshot API Docs: guava
 * Snapshot API Diffs: 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-announce: Announcements of releases and upcoming significant changes
 * 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. If your code is a library, we strongly recommend using the
    Guava Beta Checker to ensure that you do not use any @Beta APIs!

 2. APIs without @Beta will remain binary-compatible for the indefinite future.
    (Previously, we sometimes removed such APIs after a deprecation period. The
    last release to remove non-@Beta APIs was Guava 21.0.) Even @Deprecated APIs
    will remain (again, unless they are @Beta). We have no plans to start
    removing things again, but officially, we’re leaving our options open in
    case of surprises (like, say, a serious security problem).

 3. Guava has one dependency that is needed for linkage at runtime:
    com.google.guava:failureaccess:1.0.2. It also has some annotation-only
    dependencies, which we discuss in more detail at that link.

 4. 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.

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

 6. For the mainline flavor, we test the libraries using OpenJDK 8, 11, and 17
    on Linux, with some additional testing on newer JDKs and on Windows. Some
    features, especially in com.google.common.io, may not work correctly in
    non-Linux environments. For the Android flavor, our unit tests also run on
    API level 15 (Ice Cream Sandwich).

© Guava 2023