Problème de déclaration de rollback, et commit comment faire?

public void rollback(java.sql.Savepoint s).

public void rollback(java.sql.Savepoint s) throws SQLException {
       conn.rollback();
     }

public void commit(java.sql.Savepoint s) throws SQLException {
       conn.commit();

public void java.sql.PreparedStatement prepareStatement(java.lang.String sql)throws SQLException {
       conn.PreparedStatement();