Question

I have the following code :

public class My_program {

    class dbConnect {
       public dbConnect();
       public void connect_to_db(String connect_string) {
          Class.forName(...);
          ...
       }
    }

    public static void main(String[] args) {
       String connect_string = "jdbc...";
       dbConnect db = new dbConnect();
       db.connect_to_db(connect_string)
    }
}

When I try to compile it, the following error occurs :

error: non-static variable this cannot be referenced from a static context

so I tried to make the dbConnect static like this : static class dbConnect and it’s working ok but java is generating an extra .class file : My_program$dbConnect.class that I do not want.

So how can I have a single .class file and get the code to work .

Answer 1

one way depending on your requirement:

public class My_program {

My_program() { }


public void connect_to_db(String connect_string) {
      Class.forName(...);
      ......
   }

public static void main(String[] args) {
   String connect_string = "jdbc......";
   My_program db = new My_program();
   db.connect_to_db(connect_string)
}

}