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OpenJDK (Open Java Development Kit) is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). [2] It is the result of an effort Sun Microsystems began in 2006, four years before the company was acquired by Oracle Corporation.
OpenJDK 20.0.1 GraalVM for JDK 21 2023-09-19 Oracle JDK 21 OpenJDK 21 This release brought all Java SE 21 features to GraalVM such as virtual threads from Project Loom. Performance improvements in this release made ahead-of-time compiled Java applications run at peak performance as on HotSpot.
Experimental OpenJDK prototypes can also be built from the Mercurial repositories. These are starting to incorporate many specialization features. Note that these are Gnu Make/ C++ sources, and building the OpenJDK requires technical expertise. See OpenJDK build instructions for details. Project Valhalla OpenJDK source repositories
The Java platform is a suite of programs that facilitate developing and running programs written in the Java programming language. A Java platform includes an execution engine (called a virtual machine), a compiler and a set of libraries; there may also be additional servers and alternative libraries that depend on the requirements.
Each of the language compilers is a separate program that reads source code and outputs machine code. All have a common internal structure. All have a common internal structure. A per-language front end parses the source code in that language and produces an abstract syntax tree ("tree" for short).
The Java Development Kit (JDK) is a distribution of Java technology by Oracle Corporation.It implements the Java Language Specification (JLS) and the Java Virtual Machine Specification (JVMS) and provides the Standard Edition (SE) of the Java Application Programming Interface (API).
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]
IcedTea is a build and integration project for OpenJDK launched by Red Hat in June 2007. [3] IcedTea also includes some addon libraries: IcedTea-Web is a free software implementation of Java Web Start and the Java web browser applet plugin.