Can Java Applications deal with hardware without use JNI

Thanks!!

No.
The JVM deals exclusively with existing OS software. So, for example, even though the hard drive is hardware, the JVM uses the OS io routines to talk to it.
If you have a custom piece of hardware then you will need something similar.
If it is a serial/parallel device then you can look at the comm api.
If it is really unusual then you could write a miny driver server than uses sockets. Then the java app would just use on box sockets to control it so no JNI would be needed. (But C/C++ still would be required for the server.)

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