Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/niitdb","root","");

for(pos=0; pos<7; pos++){

     SQL = "SELECT `concept name` FROM `concepts " +course+ "` where `concept id` = " + pos+1;
     Statement stmt = con.createStatement();
     rs = stmt.executeQuery(SQL);
     rs.next();
     Cname[cnt] = new JLabel(rs.getString("concept name")); // error is on this line