OC2-重写

//
//  Dog.h
//  OC2-重写
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Animal.h"

@interface Dog : Animal
{
float _weight;
}
@property (assign,nonatomic)float weight;
@end

//
//  Dog.m
//  OC2-重写
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Dog.h"
//重写父类的继承过来的方法,不需要再次声明
@implementation Dog
-(void)printAnimalInformation
{
NSLog(@"name=%@,age=%i,,weight=%.2f",_name,_age,_weight);
}
-(void)showAnimalFood
{
NSLog(@"%@_____",[self class]);
}
@end

//
//  Animal.h
//  OC2-重写
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Animal : NSObject
{
NSString *_name;
int _age;

}
@property (copy,nonatomic)NSString *name;
@property(assign,nonatomic)int age;
-(void)showAnimalFood;
-(void)printAnimalInformation;
@end

//
//  Animal.m
//  OC2-重写
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Animal.h"

@implementation Animal
-(void)showAnimalFood
{
NSLog(@"%@_____",[self class]);
}
-(void)printAnimalInformation
{
NSLog(@"name=%@,age=%i",_name,_age);
}
@end

//
//  main.m
//  OC2-重写
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"
#import "Animal.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {

Dog *xiaobai =[[Dog alloc] init];
xiaobai.name=@"121";
xiaobai.age=12;
xiaobai.weight=12;

[xiaobai printAnimalInformation];
[xiaobai showAnimalFood];

Animal *xiaohei =[[Animal alloc] init];
xiaohei.name=@"xiaohei";
xiaohei.age=11;
[xiaohei printAnimalInformation];
[xiaohei showAnimalFood];

}
return 0;
}