1    package model; 
2     
3    import java.util.function.Consumer; 
4     
5    class Ingredient { 
6        
7        int max; 
8        String name; 
9        int quantity; 
10       Consumer<Ingredient> onEmptyAction; 
11       Dispenser dispenser; 
12        
13       Ingredient(String name, int max, Dispenser dispenser) { 
14           this.dispenser = dispenser; 
15           this.name = name; 
16           this.max = max; 
17           this.quantity = max; 
18       } 
19        
20       void onEmpty(Consumer<Ingredient> f) { 
21           this.onEmptyAction = f; 
22       } 
23        
24       boolean empty() { return quantity == 0; } 
25        
26       void use() { 
27           if (empty() && onEmptyAction != null) { 
28               onEmptyAction.accept(this); 
29           } else { 
30               quantity--; 
31               dispenser.addIngredient(name); 
32           } 
33       } 
34        
35       void refill() { 
36           System.out.print(name + "refilled"); 
37           quantity = max; 
38       } 
39   } 
40    
41