public class SingleSpoon 
{  
   private Soup soupLastUsedWith;
   
   private static SingleSpoon theSpoon;
   private static boolean theSpoonIsAvailable = true;
   
   private SingleSpoon() {}
     
   public static SingleSpoon getTheSpoon() {
       if (theSpoonIsAvailable) {
           if (theSpoon == null) {
               theSpoon = new SingleSpoon();
           }
           theSpoonIsAvailable = false;
           return theSpoon;
       } else {
           return null;
           //spoon not available, 
           //  could throw error or return null (as shown)
       }
   }
    
   public String toString() {
       return "Behold the glorious single spoon!";
   }
    
   public static void returnTheSpoon() {
       theSpoon.cleanSpoon();
       theSpoonIsAvailable = true;
   }     
   
   public Soup getSoupLastUsedWith() {
       return this.soupLastUsedWith;
   }
   public void setSoupLastUsedWith(Soup soup) {
       this.soupLastUsedWith = soup;
   }

   public void cleanSpoon() {
       this.setSoupLastUsedWith(null);
   }   
}