guava

by google

google /guava

Google core libraries for Java

38.9K Stars 8.7K Forks Last release: 6 months ago (v29.0) Apache License 2.0 5.3K Commits 90 Releases

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Guava: Google Core Libraries for Java

Latest release Build Status

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, caching, 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 JDK 1.7 or 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 Java 7 or by any library that wants to be compatible with either of those. These flavors are specified in the Maven version field as either
29.0-jre
or
29.0-android
. For more about depending on Guava, see using Guava in your build.

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

  com.google.guava
  guava
  29.0-jre
  
  29.0-android

To add a dependency using Gradle:

dependencies {
  // Pick one:

// 1. Use Guava in your implementation only: implementation("com.google.guava:guava:29.0-jre")

// 2. Use Guava types in your public API: api("com.google.guava:guava:29.0-jre")

// 3. Android - Use Guava in your implementation only: implementation("com.google.guava:guava:29.0-android")

// 4. Android - Use Guava types in your public API: api("com.google.guava:guava:29.0-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

Links

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 at runtime:

    com.google.guava:failureaccess:1.0.1
  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 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 15 (Ice Cream Sandwich).

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