GCJ

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{{wikipedia|GNU Compiler for Java}} {{implementation|Java}}{{collection|GNU Compiler Collection}} The '''GNU Compiler for Java''' (a.k.a. '''GCJ''' or '''gcj''') is a free software compiler for the [[:Category:Java|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.