day06-05-多态1

Objective-c

//  main.m
//  day06-05-多态1
//
//  Created by Aaron on 15/7/8.
//  Copyright (c) 2015年 Aaron. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Dog.h"
#import "Cat.h"
//多态
//同一个接口,不同的实现
//继承: 统一接口
void animal_bark(Animal *d)
{
    [d bark];
}
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Dog *d = [[Dog alloc] init];
        Cat *cat = [[Cat alloc] init];
        Animal *a = [[Animal alloc] init];
        [d bark];
        [cat bark];
        [a bark];
        animal_bark(cat);
        //赋值兼容原则
        //可以用父类的指针指向子类的对象
        Animal *anim = d;
    }
    return 0;
}

#import <Foundation/Foundation.h>
@interface Animal : NSObject
-(void)bark;
@end

#import "Animal.h"
@implementation Animal
-(void)bark
{
    NSLog(@"嗷嗷嗷...");
}
@end

#import "Animal.h"
@interface Dog : Animal
@end

#import "Dog.h"
@implementation Dog
-(void)bark
{
    NSLog(@"汪汪汪....");
}
@end

#import "Animal.h"
@interface Cat : Animal
@end

#import "Cat.h"
@implementation Cat
-(void)bark
{
    NSLog(@"喵喵喵....");
}
@end