objective-c的description测试

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#import <Foundation/Foundation.h>@interface Human : NSObject  {    int age;    NSString *name;    Human *child;}@property int age;@property (copy)NSString *name;@property (retain)Human *child;@end@implementation Human@synthesize name;@synthesize age;@synthesize child;/*一般情况下，一个自定义类我们在用%@输出的时候，给出的是一个内存地址，我们在该类的.m文件里重写description方法，来修改输出内容*/#if 1-(NSString *)description  {    NSString *des = [NSString stringWithFormat:@"->%@,%d,%@",name,age,child];    return des;}#endif@endint main(int argc, const char * argv[]) {    NSAutoreleasePool *pool =[[NSAutoreleasePool alloc] init];    Human *human1=[[Human alloc]init];    Human *human2=[[Human alloc]init];    human2.name=@"jeck";    human2.age=23;        human1.child=human2;    human1.name=@"holydancer";    human1.age=22;        NSLog(@"%@",human1);    [pool release];    return 0;}

结果：

2016-12-02 11:46:52.998 test[7289] ->holydancer,22,->jeck,23,(null)

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