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All Java programs are written into a file with a ".java" extension.
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Applications are .java files with a main method which is excuted first.
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How to compile and run a Java application (via bytecodes):
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Run the compiler on a .java file:
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javac MyProgram.java
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producing a file "MyProgram.class" of Java bytecodes
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Run the interpreter on a .class file:
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java MyProgram
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which executes the bytecodes
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The resources javac and java are part of JDK and are not in Netscape and so are not necessarily available on the same machine as your web server.
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