java code help...

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I'm really trying to understand java, and right now, all I have are 2
examples, that I found out on the net...
And I got them to compile and run, on the PC, using the 400 toolbox jar..

I was wondering if someone could hold my hand for a few minutes, and offer
me a great big push in the right direction...

Question #1.  I have this code, and I have modified it, so I could attempt
to qualify the field names...  But it didn't work... Could someone please
correct my error.

ERROR Message at runtime: An undefined column name was detected.

    ResultSet rs = stmt.executeQuery ("SELECT * FROM QIWS.QCUSTCDT A ORDER
BY LSTNAM");
        while (rs.next ()) {
                String cusnum = rs.getString("A.CUSNUM");

Question #2,  Could someone please show me how to take the result set that I
get, and instead of printing it in a dos window, how would I place the data
in a real window on my pc, in a datasheet type view (similar to excel, or
when I do an SQL through ops nav)...

I offer many thanks,  tim...