Java compiler

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

Contents

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]

It is provided by module jdk.compiler, and requires the full Java Development Kit (as opposed to just the Java Runtime Environment), and reside in the javax.tools.* namespace. [4]

Example

packageorg.wikipedia.examples;importjava.io.IOException;importjava.io.File;importjavax.tools.JavaCompiler;importjavax.tools.ToolProvider;publicclassExample{privatefinalStringTEST_FILE_NAME="Test.java";publicstaticvoidmain(String[]args)throwsIOException{FilesourceFile=newFile(TEST_FILE_NAME);if(!sourceFile.exists()){thrownewIllegalArgumentException(String.format("File path %s does not exist!",TIME_FILE_NAME));}JavaCompilercompiler=ToolProvider.getSystemJavaCompiler();if(compiler==null){thrownewRuntimeException("Compiler not available. Are you running on a JRE instead of a JDK?");}intresult=compiler.run(null,null,null,sourceFile);System.out.printf("Compilation result: %s%n",result==0?"Success":"Failure");}}

See also

References

  1. ↑ "GCJ - past, present, and future". Archived from the original on 2019-08-02. Retrieved 2021-09-24.
  2. ↑ "The Java Virtual Machine Specification, Java SE 8 Edition, Section 1.2". Archived from the original on 2021-09-24. Retrieved 2021-09-24.
  3. ↑ "JSR 199: JavaTM Compiler API". Archived from the original on 2021-09-24. Retrieved 2021-09-24.
  4. ↑ "JavaCompiler (Java SE)". docs.oracle.com. Oracle Corporation. Retrieved 21 October 2025.


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