You can find the Java APIs at Sun's website. See related links.

The Java web site (java.sun.com) has the APIs. See the related link.

There are 3 types of Java Programming Language Application Programming Interfaces (APIs) :

• The official core Java API, contained in the JDK or JRE, of one of the editions of the Java Platform. The three editions of the Java Platform are Java ME (Micro edition), Java SE (Standard edition), and Java EE (Enterprise edition).

• Optional official APIs that can be downloaded separately. The specification of these APIs are defined according to a Java Specification Request (JSR), and sometimes some of these APIs are later included in the core APIs of the platform (the most notable example of this kind is Swing).

• Unofficial APIs, developed by third parties, but not related to any JSRs.

Third-parties can freely implement any JSR specifications for an official API (even for the core API of the language), providing that they conform to the Technology Compatibility Kit (TCK) for this JSR (the TCK is a suite of tests that checks conformance of implementations for a JSR). The result of this freedom is that many official APIs have more implementations than the Sun's Reference implementation (RI).

Java is a programming language that has two main types:

1. Java SE (Standard Edition): This is the core Java language that provides all the basic features and functionalities of Java. It includes the Java Virtual Machine (JVM), which is responsible for running Java programs, and the Java Development Kit (JDK), which is used for developing Java applications.

2. Java EE (Enterprise Edition): This is a set of Java APIs (Application Programming Interfaces) and technologies that are used for developing large-scale, distributed, and enterprise-level applications. Java EE includes a variety of APIs such as Servlets, JSPs, EJBs, JPA, JMS, and many others. These APIs provide a rich set of features for developing complex and robust enterprise applications.

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The Core Java technologies and application programming interfaces (APIs) are the foundation of the Java Platform, Standard Edition (Java SE). They are used in all classes of Java programming, from desktop applications to Java EE applications.

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