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  1. import java.lang.*;
  2.  
  3. class Main {
  4. 	public static void main(String[] argv) {
  5. 	    SandwichMaker<Cheese> sandwich = new CheeseSandwichMaker();
  6. 	    sandwich.make(new Cheese("Camembert", "Normandy, France"));
  7. 	    sandwich.make(new Cheese("Cheddar", "Somerset, England"));
  8. 	} 
  9. }	
  10.  
  11.  
  12. abstract class SandwichMaker<S extends Spread> {
  13.     public void make(S spread) {
  14.         toastBread();
  15.         addSpread(spread);
  16.         enjoy();
  17.     }
  18.  
  19.     protected void toastBread() {
  20.         System.out.println("...toasting bread");
  21.     }
  22.  
  23.     protected abstract void addSpread(S spread);
  24.  
  25.     protected void enjoy() {
  26.         System.out.println("this is yummy!");
  27.     }
  28. }
  29.  
  30. class CheeseSandwichMaker extends SandwichMaker<Cheese> {
  31.     @Override
  32.     protected void addSpread(Cheese cheese) {
  33.         System.out.println("... adding " + cheese.name + " cheese from " + cheese.origin);
  34.     }
  35. }
  36.  
  37. interface Spread {}
  38. class Cheese implements Spread {
  39.     public final String name;
  40.     public final String origin;
  41.  
  42.     public Cheese(String name, String origin) {
  43.         this.name = name;
  44.         this.origin = origin;
  45.     }
  46. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
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...toasting bread
... adding Camembert cheese from Normandy, France
this is yummy!
...toasting bread
... adding Cheddar cheese from Somerset, England
this is yummy!
https://ideone.com/t6GoMB
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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