1. #import <Foundation/Foundation.h>
   
2. @interface Dog : NSObject
   
3. {
   
4.     char *_name;
   
5. }
   
6. -(void)run;
   
7. -(void)catchThief;
   
8. @end
   
9. @implementation Dog
   
10. -(void)run
    
11. {
    
12.     NSLog(@"%s在跑",_name);
    
13. }
    
14. -(void)catchThief
    
15. {
    
16.     NSLog(@"警犬抓小偷");
    
17. }
    
18. @end
    
19. 
    
20. @interface Police : NSObject
    
21. {
    
22.     Dog *_dog;
    
23.     char *_name;
    
24. }
    
25. -(void)run;
    
26. +(void)catchThief;
    
27. -(void)setDog:(Dog *)dog;
    
28. -(Dog *)getDog;
    
29. @end
    
30. @implementation Police
    
31. -(void)run
    
32. {
    
33.     NSLog(@"%s在跑",_name);
    
34. }
    
35. +(void)catchThief
    
36. {
    
37.     NSLog(@"警察抓小偷");
    
38. }
    
39. -(void)setDog:(Dog *)dog
    
40. {
    
41.     _dog = dog;
    
42. }
    
43. -(Dog *)getDog
    
44. {
    
45.     return _dog;
    
46. }
    
47. @end
    
48. 
    
49. int main()
    
50. {
    
51.     Police *jinPing = [Police new];
    
52.     Dog *dog = [Dog new];
    
53.     [jinPing setDog:dog];
    
54.     [[jinPing getDog] catchThief];
    
55.     return 0;
    
56. }
    

复制代码

写的不错啊

不明所以