gistfile1.java

package demo;

public abstract class Homer implements EatsDonuts{
   public Homer() { }
   public void eat() {
         Donut d = getDonut();  //We want a new donut every time
         //eat donut
   }
  
//here is where Spring will do its magic and return a prototype
protected abstract Donut getDonut();

// I actually prefer to do it this way, so that we don't have to make the class
// abstract:
/*
   public Donut getDonut() {
       return null; //if we get NPE, we know something went wrong in our xml file
       // or we can have:
       // return new TastyDonut(); // so that the legacy code stays the same
   }
*/
}