Java compiler: Difference between revisions
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{{Short description|Program compiler for Java programming language}} |
{{Short description|Program compiler for Java programming language}} |
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A '''Java compiler''' is a [[compiler]] for the programming language [[Java (programming language)|Java]]. The most common form of output from a Java compiler is [[Java class file]]s containing platform-neutral [[Java bytecode]]<ref>{{Cite web|title=The Java Virtual Machine Specification, Java SE 8 Edition, Section 1.2|url=https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-1.html#jvms-1.2|access-date=2021-09-24|language=en}}</ref> |
A '''Java compiler''' is a [[compiler]] for the programming language [[Java (programming language)|Java]]. The most common form of output from a Java compiler is [[Java class file]]s containing platform-neutral [[Java bytecode]],<ref>{{Cite web|title=The Java Virtual Machine Specification, Java SE 8 Edition, Section 1.2|url=https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-1.html#jvms-1.2|access-date=2021-09-24|language=en}}</ref> but there are also compilers that output optimized [[Machine code|native machine code]] for a particular hardware/[[operating system]] combination, most notably the now discontinued [[GNU Compiler for Java]].<ref>{{Cite web|title=GCJ - past, present, and future|url=https://lwn.net/Articles/130796/|access-date=2021-09-24|language=en}}</ref> |
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Most Java-to-bytecode compilers do virtually no [[Optimization (computer science)|optimization]], leaving this until [[Run time (program lifecycle phase)|run time]] to be done by the [[Java virtual machine]] (JVM).{{Citation needed|date=September 2021}} |
Most Java-to-bytecode compilers do virtually no [[Optimization (computer science)|optimization]], leaving this until [[Run time (program lifecycle phase)|run time]] to be done by the [[Java virtual machine]] (JVM).{{Citation needed|date=September 2021}} |
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Revision as of 23:16, 4 October 2021
A Java compiler is a compiler for the programming language Java. The most common form of output from a Java compiler is Java class files containing platform-neutral Java bytecode,[1] but there are also compilers that output optimized native machine code for a particular hardware/operating system combination, most notably the now discontinued GNU Compiler for Java.[2]
Most Java-to-bytecode compilers do virtually no optimization, leaving this until run time to be done by the Java virtual machine (JVM).[citation needed]
The 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 programmatically was specified in JSR 199.[3]
See also
- List of Java Compilers
- javac, the standard Java compiler in Oracle's JDK
References
- ^ "The Java Virtual Machine Specification, Java SE 8 Edition, Section 1.2". Retrieved 2021-09-24.
- ^ "GCJ - past, present, and future". Retrieved 2021-09-24.
- ^ "JSR 199: JavaTM Compiler API". Retrieved 2021-09-24.
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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