Hi Dang_Randy,
Doing the following might help.
1) On the enter/initialize event of DD1, call a servlet that fetches all the fruits. Split and add the fruit items to DD1.
2) Once the fruit is selected from DD1, on the exit or change event of DD1, call another servlet (pass fruit selected in DD1) that fetches the colors of the fruit.
Hope this helps.
Thanks,
VJ