Plz help me in it, thnx

Hello Friends,
I need some help from u,
i have table like below
table name A
Details Debit Credit
aa 100 200
bb 50 30
cc 25 150
i try "select SUM(Debit),SUM(Credit) from A"
But
how can i get the diff between Debit Sum & Credit Sum ,
can any1 suggest me query,
i want to use this in resultset, in java servlet
if any1 can help me plz, help me out,
thank you,

SQL> select * from a;
DETAILS                   DEBIT               CREDIT
aa                          100                  200
bb                           50                   30
cc                           25                  150
SQL> select SUM(Debit),SUM(Credit) from A;
          SUM(DEBIT)          SUM(CREDIT)
                 175                  380
SQL> select SUM(Debit) - SUM(Credit) diff from A;
                DIFF
                -205

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