You have the right idea. The error is caused because you have two variable declarations withe same name:
<pre>ArrayList data = handler.getnames()
and
ArrayList data = handler.getsetnums();
Java doesn't allow this. However, you don't necessarily want to "combine them together" because these are two separate lists that seem to represent two different things.
I suggest changing the names of both variables to something more meaningful than data. For example:
ArrayList names = handler.getnames()
and
ArrayList setnums = handler.getsetnums();
Presumably, names and setnums represent something meaningful for what you are doing here.
credit to
Code-Apprentice @stackoverflow<pre>