Question [Q] Can I run .jar/.jad files on Android?

Hi guys!
I really want to play some old mobile games on my N5.
I've heard aboud the JBED emulator, but it doesn't work on 2.3+ devices.
I also tried to convert the files to apk, with this online converter: http://www.netmite.com/android/srv/2.0/getapk.php
But it seems to fail with all of my .jar and .jad files.
Is there any other way to do this?
Can I port an older game with (nearly) 0 programming skill to Android?
Sent from my LG Nexus 5
Rooted, 4.4.2 KitKat, Cyanogenmod 11, Stock Kernel, Apex Launcher