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实现1：

#import 
   
    @interface Gun:NSObject{
       @public    NSString *_type;    int _bllutCount;}-(void)shot;@end@implementation Gun-(void)shot{    if(_bllutCount >0){        _bllutCount--;    }    NSLog(@"%@ is shoting ..., the bllut is leave :%d",_type,_bllutCount);}@end@interface Person : NSObject{
       @public    NSString *_name;    int _life;    int _level;}-(void)fire:(Gun *) gun;@end@implementation Person-(void)fire:(Gun *) gun{    [gun shot];}@endint main(int argc, const char * argv[]){    @autoreleasepool {        //        Person *p = [Person new];        p->_name = @"tom";        p->_life = 100;        p->_level = 10;        Gun *gun = [Gun new];        gun ->_type = @"china";        gun ->_bllutCount = 6;        [p fire:gun];        [p fire:gun];        [p fire:gun];        NSLog(@"Hello, World!");    }    return 0;}
   

实现2：

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