1. 构建一个动物类作为父类,猫科动物子类继承动物类,老虎子类继承猫科 动物 每个类都实现一个不同的cry方法。
借口文件1:Animal.h
#import <Foundation/Foundation.h>
@interface Animal : NSObject
- (void) cry;
@end
实现文件1:Animal.m
#import "Animal.h"
@implementation Animal
- (void) cry
{
NSLog(@"%@",@"The animal is crying!");
}
@end
借口文件2:Feline.h
#import "Animal.h"
@interface Feline : Animal
- (void) cry;
@end
实现文件2:Feline.m
#import "Feline.h"
@implementation Feline
- (void) cry
{
NSLog(@"%@",@"The feline is crying!");
}
@end
借口文件3:Tiger.h
#import "Feline.h"
@interface Tiger : Feline
- (void) cry;
@end
实现文件3:Tiger.m
#import "Tiger.h"
@implementation Tiger
- (void) cry
{
NSLog(@"%@",@"The tiger is crying!");
}
@end
测试文件：main.m
int main(int argc, char * argv[]) {
@autoreleasepool {
Bird *bird=[[Bird alloc]init];
[bird fly];
Sparrow *sparrow=[[Sparrow alloc]init];
[sparrow fly];
[sparrow sing];
[sparrow set_ID:@"1234"];
[sparrow print_ID];
Bird *bird1=[[BlackSparrow alloc]init];
BlackSparrow *bs = bird1;//强制类型转换
bs.ID = @"sssss";
[bird1 fly];
[bird1 eat];
[bird1 sing];
[bird1 print_ID];
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
2. 构建Transportation、Car、Lorry类,分别定义run方法。
借口文件1:Transportation.h
#import <Foundation/Foundation.h>
@interface Transportation : NSObject
- (void) run;
@end
实现文件1:Transportation.m
#import "Transportation.h"
@implementation Transportation
- (void) run
{
NSLog(@"%@",@"The transportation is runing!");
}
@end
借口文件2:Car.h
#import "Transportation.h"
@interface Car : Transportation
- (void) run;
@end
实现文件2:Car.m
#import "Car.h"
@implementation Car
- (void) run
{
NSLog(@"%@",@"The car is runing!");
}
@end
借口文件3:Lorry.h
#import "Car.h"
@interface Lorry : Car
- (void) run;
@end
实现文件3:Lorry.
#import "Lorry.h"
@implementation Lorry
- (void) run
{
NSLog(@"%@",@"The lorry is runing!");
}
@end
测试文件：main.m
#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import "Lorry.h"
int main(int argc, char * argv[]) {
@autoreleasepool {
Transportation *transportation = [[Transportation alloc]init];
Car *car = [[Car alloc]init];
Lorry *lorry = [[Lorry alloc]init];
[transportation run];
[car run];
[lorry run];
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}