is it possible to do a simple project "hostel management system" using biometric sensors just by using java both for the front end application and for the behind working?
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Yes.
For the front end:
no problem when using SwingSwing. (But I would use the browser and HTML5 as front end, and Java (JSP) as back end.)
For the back end:
Reading data from sensors may be time critical. Therefore you need an OS that can prioritize and scale parallel running processes and threads in a fine granular way. So Windows is not suitable, but other operating systems like QNX (search about OS for embedded sytems) can do it. A lot of embedded devices are running Java!
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