Java compiler

Short description: Program compiler for Java programming language

A Java compiler is a compiler for the Java programming language.

Some Java compilers output optimized machine code for a particular hardware/operating system combination, called a domain specific computer system. An example would be the now discontinued GNU Compiler for Java.[1]

The most common form of output from a Java compiler is Java class files containing cross-platform intermediate representation (IR), called Java bytecode.[2]

The Java virtual machine (JVM) loads the class files and either interprets the bytecode or just-in-time compiles it to machine code and then possibly optimizes it using dynamic compilation.

A standard on how to interact with Java compilers was specified in JSR 199.[3]

## See also

* List of Java Compilers
* javac, the standard Java compiler in Oracle's JDK

## References

1. ↑ "GCJ - past, present, and future" (in en). https://lwn.net/Articles/130796/.
2. ↑ "The Java Virtual Machine Specification, Java SE 8 Edition, Section 1.2" (in en). https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-1.html#jvms-1.2.
3. ↑ "JSR 199: JavaTM Compiler API". https://jcp.org/en/jsr/detail?id=199.

## External links

* Sun's OpenJDK javac page
* Stephan Diehl, "A Formal Introduction to the Compilation of Java", Software - Practice and Experience, Vol. 28(3), pages 297-327, March 1998.

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