Batch updates is a facility given by the JDBC to the 
application developers to submit a set of SQL update 
statements as batch to the database.

st.addBatch("Update statement1");
st.addBatch("Update statement2");
st.addBatch("Update statement3");

int updated[]=st.executeBatch();// This methods throws 
BatchUpdateException and SQLException

Batch Update provide the functionality of executing a group 
of sql statement at single timing.

Steps:

1.set autocommit as false for connection .
       connectionObject.setAutoCommit(false);
2.create sql statement and add to statement object.
       statementObj.addBatch("sql1");
       statementObj.addBatch("sql2");
       statementObj.addBatch("sql3");
3.execute the batch of statement using executeBatch().
      statementObj.executebatch();
4. commit the connection.
            connectionObj.commit();