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What is byte code?

uma kant pandey
Greenhorn

Joined: Jan 06, 2009
Posts: 1
What is bytecode ?What does it actually contain ?
Henry Wong
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Sheriff

Joined: Sep 28, 2004
Posts: 18141
    
  39


The way to think of bytecode is that it is the binary code for the Java virtual machine. The Java compiler takes your Java source, and compiles it to byte code.

Now, this Java virtual machine, is merely a virtual machine, so when it is loaded into the JVM, it will be compiled again to the native op codes -- which will be different based on the local processor and OS.


Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 36599
    
  16
You can read the bytecode with a hex editor, and look in the JVM specification where you can see what each code means. It looks very similar to assembler.
 
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