1    package model; 
2     
3    class BasicDisplay { 
4     
5        void setRed() { 
6            System.out.println("Red set"); 
7        } 
8     
9        void setYellow() { 
10           System.out.println("Yellow set"); 
11       } 
12    
13       void setGreen() { 
14           System.out.println("Green set"); 
15       } 
16        
17       void unsetRed() { 
18           System.out.println("Red unset"); 
19       } 
20    
21       void unsetYellow() { 
22           System.out.println("Yellow unset"); 
23       } 
24    
25       void unsetGreen() { 
26           System.out.println("Green unset"); 
27       } 
28    
29       void setAll() { 
30           System.out.println("Red, Yellow, Green set"); 
31       } 
32    
33       void unsetAll() { 
34           System.out.println("Red, Yellow, Green unset"); 
35       } 
36   } 
37