java

what ADT to use for the following (from an assignment i got in class):

each collection has its set of elements
when i join those collections i get a new collection with all  the elements which were in each collection in the first place

im out of ideas

Get some new ideas from the idea store.

nobody knows?
i dont want to use sql

You don't seem to want to use capital letters either.

I am missing workout since last 2 months and I found my stomock gaining fat
Now the main problem is starting with the loss of waight from upper body.