It's easy to check the JDK version that a .class file has been compiled with using the javap tool. Simply run something like this...
That will produce output like this...
Even though I primarily code in Java, I never remember the class version names and their equivalent JDK versions. So instead of looking it up I added this handy function to my Bash ~/.profile file to tell me the JDK version for a .class file...
Using it is simple, simply do this:
The output is a little bit more friendly than what javap produces, for example:
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