Main.m
#import <Foundation/Foundation.h>
#import "ColorPrinte.h"
#import "Blackprinter.h"
#import "ThreeDPrinter.h"
#import "Printer.h"
#import "Person.h"
int main(int argc, const char * argv[])
{
/*
//使用彩色打印机打印
Person *person = [[Person alloc] init];
// ColorPrinte *colorPrint = [[ColorPrinte alloc] init];
Blackprinter *blackPrint = [[Blackprinter alloc] init];
// [person printWithColorkPrint:colorPrint];
//使用黑白打印机打印
// [person printWithBlackPrint:blackPrint];
//使用3D打印机
ThreeDPrinter *threeDPrint = [[ThreeDPrinter alloc] init];
[person printWith3DPrint:threeDPrint];
*/
/*
人 *人 = ［男人 alloc］init］；
*/
//用父类声明的变量指向子类的对象
// Printer *printer = [[ColorPrinte alloc] init];
// [printer print];
//--------------------多态---------------------
Person *person = [[Person alloc] init];
//创建三个打印机
ColorPrinte *colorPrint = [[ColorPrinte alloc] init];
Blackprinter *blackPrint = [[Blackprinter alloc] init];
ThreeDPrinter *threeDPrint = [[ThreeDPrinter alloc] init];
int cmd;
while (1) {
NSLog(@"请输入选择的打印机类型（1、黑白，2、彩色，3、3D）：");
scanf("%d",&cmd);
if (cmd == 1) {
[person printer:blackPrint];
}else if (cmd == 2) {
[person printer:colorPrint];
}else if (cmd == 3) {
[person printer:threeDPrint];
}else {
NSLog(@"输入有误");
}
}
/*
多态：
1、继承
2、方法重写
3、父类声明的变量指向子类对象
*/
return 0;
Person.h
#import <Foundation/Foundation.h> #import "Blackprinter.h" #import "ColorPrinte.h" #import "ThreeDPrinter.h" #import "Printer.h" @interface Person : NSObject /* //使用黑白打印机 - (void)printWithBlackPrint:(Blackprinter *)blackPrint; //使用彩色打印机 - (void)printWithColorkPrint:(ColorPrinte *)colorPrint; //使用3D打印机 - (void)printWith3DPrint:(ThreeDPrinter *)threeDPrint; */ - (void)printer:(Printer *)printer;
Person.m
#import "Person.h"
@implementation Person
/*
//使用黑白打印机
- (void)printWithBlackPrint:(Blackprinter *)blackPrint {
//调用黑白打印机的打印方法
[blackPrint print];
}
//使用彩色打印机
- (void)printWithColorkPrint:(ColorPrinte *)colorPrint {
//调用彩色打印机的打印方法
[colorPrint print];
}
//使用3D打印机
- (void)printWith3DPrint:(ThreeDPrinter *)threeDPrint {
[threeDPrint print];
}
*/
- (void)printer:(Printer *)printer {
[printer print];
}
Printer.h
- (void)print;Printer.m
- (void)print {
NSLog(@"打印机打印纸张");
}
BlackPrinter.m
- (void)print {
NSLog(@"黑白打印机打黑白印纸张");
}
ColorPrinter.m
- (void)print {
NSLog(@"彩色打印机打印彩色纸张");
}
ThreeDPrinter.m
- (void)print {
NSLog(@"3D打印机打印3D");
}