how to install java game that come form zip file

[jade_da]

i can't install java game that it's in zip format,

i have try
1. when i extract it all of them are *.class
2. i change game.zip to game.jar and install
it's can install but i cannot play when i enter game for a few minnute later program(game) will stop

how to i do

thx

[boo1985]

does it just occur for one game, or has already occur to afew games??