Hi you may need to download and install Java for mobiles on your phone and then Java applications will work. Also make sure that you allow the running of non-signed applications too in settings.
Have a look at this link below to learn all about it.
http://www.oracle.com/technetwork/java/javame/index.html
Below is your user guide it is also explained in there too.
http://www.phonearena.com/phones/Samsung-Champ_id4645/manual
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