For example, the java.lang.instrumentation package provides APIs for doing load-time instrumentation of classes ... And so on, and so on, and so on. So hop on the Java bytecode bandwagon with me for a ...

How to use the javap command. Most users of the javap tool are interested in decompiling a class and viewing the disassembled bytecode. Here’s how to use the javap tool to view bytecode instructions:.

When compiling class initializers and class initialization blocks, the Java compiler stores the compiled bytecode (in top-down order) in a special method named <clinit>().

The Java platform uses a third alternative, bytecode. With bytecode, a high-level program is translated into an intermediate form that can run on various hardware platforms.

All of these have been translated into bytecode, which is basically the instruction set for a virtual, stack-based computer. (Because some chips also have a Java bytecode instruction set, it also can ...

For example, as a post-compilation step you could massage the .class data to make the byte code either harder to read when decompiled or harder to decompile into valid Java code (or both).