Java API to find out the JDK version a class file is compiled for?

Question

Are there any Java APIs to find out the JDK version a class file is compiled for? Of course there is the javap tool to find out the major version as mentioned in here. Howev

Answer 1

As others have shown, it is easy enough to do by reading the first eight bytes of a class file. If you want a pre-built binary library, you can download one here.