OC3-父类指针指向子类对象

//
//  Cat.h
//  OC3-父类指针指向子类对象
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Animal.h"

@interface Cat : Animal
{
float _height;
}
@property (assign,nonatomic)float height;
@end

//
//  Cat.m
//  OC3-父类指针指向子类对象
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Cat.h"

@implementation Cat
-(void)printAnimalFood
{
NSLog(@"cat like to eat fish");
}
-(NSString *)description
{
return [NSString  stringWithFormat:@"name=%@,age=%li,height=%.2f",_name,_age,_height];
}
@end

//
//  Dog.h
//  OC3-父类指针指向子类对象
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Animal.h"

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

//
//  Dog.m
//  OC3-父类指针指向子类对象
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Dog.h"

@implementation Dog
-(void)printAnimalFood
{
NSLog(@"dog like to eat bone");
}
//-(NSString *)description
//{
//    return [NSString stringWithFormat:@"name=%@,age=%li,weight=%.2f",_name,_age,_weight];
//}

-(void)printAnimalHaHa
{
NSLog(@"HaHa");
}
@end

//
//  Animal.h
//  OC3-父类指针指向子类对象
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Animal : NSObject

{
NSString *_name;
NSInteger _age;
}
@property (copy,nonatomic)NSString *name;
@property(assign,nonatomic)NSInteger age;
-(void)printAnimalFood;
@end

//
//  Animal.m
//  OC3-父类指针指向子类对象
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import "Animal.h"

@implementation Animal
-(void)printAnimalFood
{
NSLog(@"-----Animal");
}
-(NSString *)description
{
return [NSString stringWithFormat:@"name111=%@,age=%li",[self name],self.age];
}
@end

//
//  main.m
//  OC3-父类指针指向子类对象
//
//  Created by qianfeng on 15/6/17.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"
#import "Cat.h"
#import "Animal.h"

void showAnimalFood(Animal *ani)
{
[ani printAnimalFood];
}
int main(int argc, const char * argv[]) {
@autoreleasepool {

Dog    *xiaohei =[[Dog alloc] init];
xiaohei.name=@"xiaogei";
xiaohei.age=12;
xiaohei.weight=12.6;

//[xiaohei description];
NSLog(@"%@",xiaohei);

Cat *xiaomao =[[Cat alloc] init];
xiaomao.name=@"xiaomao";
xiaomao.age=12;
xiaomao.height=12.6;
//[xiaohei description];
NSLog(@"%@",xiaomao);
//父类的对象指针可以指向子类的对象
//调用的方法看具体的对象类型,先从子类查找对应的方法实现,如果子类没有实现对应的方法,跳到父类查找对应的方法实现,如果父类没有实现对应的方法,再跳到父类的父类查找对应的方法实现.
Animal *ani =xiaohei;
[ani printAnimalFood];

ani=xiaomao;
[ani printAnimalFood];

showAnimalFood(xiaomao);
showAnimalFood(xiaohei);
//根据传入的不同的对象,做出不同的响应.多态

}
return 0;
}