These aren't advanced questions, so you shouldn't be posting them in Java in General(Advanced). I'm going to move this one to Java in General(Beginner) for you.
Secondly, you need to use more descriptive subject lines if you want anyone to read your posts -- this is JavaRanch, so a subject line of "Java" isn't very explanatory. I'm going to rename this post to "hashtable of arraylists" when I move it.
Finally, as to your question, I'm not sure where your problem lies. Is your code not compiling because of "incompatible type" errors? Are you unclear on how to find the arraylist associated with a particular key? Can you please clarify your question somewhat?
I have another problem with this. When I try to access Bean.getComm() by using System.out.println(" bean " +Bean .getComm()) outside for loop, I am getting null value. How can I access Bean.getComm() value outside for loop??? System.out.println(" comm