🚀 go-pugleaf

I am trying to implement an array of objects simliar to an array of
structures in c++.  I can't find examples of this in any books could
someone tell me if I'm going about it the correct way.  Or if someone
knows where I could find an example could they please tell me.

This is the class used to hold the structure:

public class ClientInfo {
       public String clientname = null;
       public String clienttype = null;
       public String acctotal = null;
}

And this is the application implementing an array of this ClientInfo.

public class GridFrame extends ClientInfo
{
   static ClientInfo clients[] = new ClientInfo[5];

  public static void main(String[] args)
  {
        clients[0].clientname = ("Claire");
        clients[0].clienttype = ("1");
        clients[0].acctotal = ("2");
  }
}

I keep getting a null pointer exception I presume this has something to
do with the way I am referencing the variables in the class.
Thanks
Claire