Is it possible to view a Java class files bytecode [duplicate]

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• Is it possible to view bytecode of Class file? [duplicate] 5 answers

I am working on a bytecode manipulation/generation in Java and I was just wondering if there is an easy way I could check the bytecode. I do not want to decompile the file, I would like to actually look at the compiled bytecode. I do not need to edit it. Any links or programs for doing this would be acceptable answers.

Answer 1

I've been working on a decompiler that has a color-coded bytecode output mode (which I find far more readable than javap). It can also output Java code or an intermediate 'bytecode AST'.

Answer 2

Since you wanted to be guided to some program that can easily show you the byte code then my suggestion is to use IntelliJ IDEA since it has built-in support for viewing byte code.

Here's an example how to do it (it can also be mapped to some keys of your choice):

It is very easy, and it can surely be done in eclipse or NetBeans as well.

Answer 3

Not sure what exactly you need, but apart from javap, which is a command-line tool for displaying the bytecode, you can take a look at javassist, asm and cglib - they allow you to parse the bytecode with java code.

Answer 4

The javap command-line tool, which is bundled with Oracle's JDK, gives a detailed textual dump of .class files along with the constant pool and all functions' bytecode content. Just run it with -v to get a full dump.