When javac is used to compile a Java program, bytecode(.class files) is generated which can be run on JVM.
Command javap can be used to display content of .class files in a meaningful way.
javap ClassName //print out field/method definition.
javap -c ClassName //print out all disassembled code.
A simple introduction:
http://www.ibm.com/developerworks/ibm/library/it-haggar_bytecode/
JVM specification:
http://java.sun.com/docs/books/jvms/
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