面向对象—多态练练

   //有一个父亲。开了一个厂,这个厂在他手里赚了100W,但是过了几年,传到他儿子手里,经过重新装修,改良了技术后,赚了2个亿。

#import <Foundation/Foundation.h>

#import "Father.h"

#import "Sub.h"

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        //father的变量,sub的实例

        Father *father = [[Sub alloc]init];

        //在运行时 father 会被转换成 sub类型

        [father getInfoWithTheFactory:father];

    }

    return 0;

 

}

 

******父类

 

#import <Foundation/Foundation.h>

 

@interface Father : NSObject

- (void)createAFactory;

- (void)getInfoWithTheFactory:(Father *)father;

 

@end

 

@implementation Father

- (void)createAFactory

{

    NSLog(@"-----------------");

    NSLog(@"工厂名称:舒家猪饲料加工厂");

    NSLog(@"工厂年收益:100W");

    NSLog(@"厂长:舒爸");

    NSLog(@"-----------------");

}

 

- (void)getInfoWithTheFactory:(Father *)father

{

    [father createAFactory];

}

@end

 

**** 子类

#import "Father.h"

 

@interface Sub : Father

 

@end

 

 

@implementation Sub

//重写

- (void)createAFactory

{

    NSLog(@"-----------------");

    NSLog(@"工厂名称:舒家猪饲料加工厂");

    NSLog(@"工厂年收益:20000W");

    NSLog(@"厂长:舒");

    NSLog(@"-----------------");

}

 

- (void)getInfoWithTheFactory:(Sub *)father

{

    [father createAFactory];

}

 

@end

posted on 2016-04-16 15:22  小|晄  阅读(87)  评论(0编辑  收藏  举报

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