How to Program in Java

To program in Java (not JavaScript, an unrelated language), you need a compiler, a program to convert Java source code to bytecode. In the old days, the only option was Sun's JDK; but now you have many options, including the GNU GCJ which creates class files or native exe files, and jikes, IBM's open source contribution. You also will need a Java virtual machine, which is a "machine within a machine" which understands Java bytecodes and translates them into machine language on the target processor. There are many available, but you can never go wrong with the javac compiler and java JRE virtual machine included with Sun's Java standard edition.

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