GCJ

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GCJ is an implementation of Java. Other implementations of Java.
GCJ is part of GNU Compiler Collection. You may find other members of GNU Compiler Collection at Category:GNU Compiler Collection.

The GNU Compiler for Java (a.k.a. GCJ or gcj) is a free software compiler for the Java programming language and a part of the GNU Compiler Collection.

GCJ can compile Java source code to either Java Virtual Machine bytecode, or directly to machine code for any of a number of CPU architectures. It can also compile class files containing bytecode or entire JARs containing such files into machine code.