I'm havn't tested it yet, but even though let me tell you, that samsung phones are not good at java apps.
First install Samsung PC Suite ( It will be in the installation CD provided with the phone, if you havn't got it, download it from samsung official site download center here
Now the second most important thing is to get the proper fully supported application for your mobile, and the best site for it i will rate is This
Go there and select your phone/Model from the left habd side menu.
Now a list of apps / games will appear but in the corner of the description you will see a tag saying that this app have been tested on the phone. Only download that app / game which got 100% tested.
And try both .jad & .jar files.
Connect the phone with PC Suit and send those files.
Hopefully, you will succeed.
If i was helpful, kindly do Rate!