How to know if Java is running in 32 or 64 bits?

Question

Is there a command for me to use where to return if my java is 32 or 64 bits, in the Java language?

Something like System.getProperty("java.version");

Something that is like that only return me if Java is 32 or 64 bits.

Answer 1

System.getProperty("sun.arch.data.model")

or indirectly

System.getProperty("os.arch");

I put in the Github for future reference.