List of Java APIs

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article has an unclear citation style. The reason given is: Violates Wikipedia:External links: "Wikipedia articles may include links to web pages outside Wikipedia (external links), but they should not normally be used in the body of an article." The references used may be made clearer with a different or consistent style of citation and footnoting. (December 2017) (Learn how and when to remove this message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "List of Java APIs" – news · newspapers · books · scholar · JSTOR (December 2017) (Learn how and when to remove this message) (Learn how and when to remove this message)

There are two types of Java programming language application programming interfaces (APIs):

• The official core Java API, contained in the Android (Google), SE (OpenJDK and Oracle), MicroEJ. These packages (java.* packages) are the core Java language packages, meaning that programmers using the Java language had to use them in order to make any worthwhile use of the Java language.
• Optional APIs that can be downloaded separately. The specification of these APIs are defined according to many different organizations in the world (Alljoyn, OSGi, Eclipse, JCP, E-S-R, etc.).

The following is a partial list of application programming interfaces (APIs) for Java.