public class Jdbc {
    public Connection connection;
    public Jdbc() {
        try{
            Class.forName("oracle.jdbc.driver.OracleDriver");
            connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","DENIS","DENIS");
            connection.setAutoCommit(false);
        }catch(Exception e) {
            System.out.println("Error : " + e);
        }
    }
    public void executeQuery(String stringParam){
        ResultSet rs;
        try (Statement stmt = connection.createStatement()) {
            rs = stmt.executeQuery(stringParam);
            while(rs.next())
                System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));
        }catch(Exception e){
            System.out.println(e);
        }
    }

}