Replace Constructor with Factory Method

You want to do more than simple construction when you create an object.

Replace the constructor with a factory method.

Employee (int type) {
  _type = type;


static Employee create(int type) {
  return new Employee(type);


Dimitri Paltchoun pointed out that as well as using Class.forName() and a string for a client to specify the created class, you can also use the class object itself. This would lead you to method like

  static Employee create(Class c){
      return (Employee)c.newInstance();
    }catch(Exception e){
      throw new IllegalException("Unable to instantiate" +c);

This would be called from this code