Factory And Singleton Design Patterns - Building A Simple Form

My assignment was to create a simple form that demonstrates the use of the factory and singleton design patterns. "Use the Factory pattern to ensure that each form input consists of a text label and a textfield. Use the Singleton pattern for the submit button."

Here's what I have:

Form.java file

interface Form {
public void getFormField ();
}
Name.java file (I have a similar files just like this for Address.java, City.java, State.java, Zip.java and Phone.java)
import java.util.Scanner;
class Name implements Form

[Code] ....

It compiles at the moment but I get a null pointer exception in the main method of the FormFactoryDemo file.