Questión of JDBC

What so.
I am a programmer in java and I want to design a module that allows me to
read the consultations that I make within poststoneware without concerning
the amount of columns nor the name of the same ones.
So my question is:
Within the JDBC that class allows me to obtain this data of the
consultations that I make to the data base?

Something thus:
SELECT * FROM tableA INNER JOIN tableB USING(column);

columnA | columnB
------------------
10 | 20

I need this:

query
-------
columnA
columnB

This can be obtained by means of the JDBC?

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