OC面向对象 点语法 继承 重写练习

父类定义

@interface Vehicle :
NSObject
{

NSString* colour;

int Speed;
}
@property
NSString* colour;

@property int Speed;

-(void)run;
-(void)drive:(NSString *)name;

@end
父类实现方法

@implementation Vehicle

@synthesize colour;

@synthesize Speed;
-(void)run{

NSLog(@"the Vehicle is ruuning");
}
-(void)drive:(NSString *)name {

NSLog(@"%@在驾驶车辆",name);
}

@end
子类car 自有属性定义

@interface Car : Vehicle
{

int numberofwheels;
}
@property
int numberofwheels;

@end
子类car 方法重写

@implementation Car
@synthesize numberofwheels;
-(void)run{

NSLog(@"the %@ car is running at the speed of %d km/h",colour,Speed);

NSLog(@"the %@ car has %d wheels",colour,numberofwheels);
}
-(void)drive:(NSString *)name {

NSLog(@"驾驶员%@在驾驶小汽车",name);
}

@end
子类truck 自有属性定义

@interface Truck : Vehicle
{
int maxweight;}
@property
int maxweight;
-(void)unload;

@end
子类truck 自有方法重写

@implementation Truck
@synthesize maxweight;
-(void)unload{

NSLog(@"卡车卸货%d吨",maxweight);
}
-(void)run{

NSLog(@"the %@ truck is running at the speed of %d km/h",colour,Speed);
}
-(void)drive:(NSString *) name{

NSLog(@"驾驶员%@在驾驶卡车",name);
}

@end
驾驶员类

@interface Person :
Vehicle
{NSString * name;}
@property
NSString * name;
-(void)dodrive:(Vehicle *) vehicle and: (NSString *) name;

@end

驾驶方法实现

@implementation Person

@synthesize name;
-(void)dodrive:(Vehicle *) vehicle and: (NSString *) name
{
[vehicle
drive:name];
}

@end

@autoreleasepool {

Car *car1=[Car
alloc];
car1.colour =@"red";
car1.Speed =
100;
car1.numberofwheels =
4;
[car1
run];

Truck *truck1 =[Truck
alloc];
truck1.colour =@"black";
truck1.Speed =
10;
truck1.maxweight =4;
[truck1
unload];
[truck1
run];

Person *person1 = [Person
alloc];
person1.name =@"小李";
[person1
dodrive:car1 and:person1.name];

Person *person2 = [Person
alloc];
person2.name =@"小张";
[person2
dodrive:truck1 and:person2.name];

}

return
0;
输出结果

2014-05-31 08:07:03.240 OC02[1066:303] the red car is running at the speed of 100 km/h
2014-05-31 08:07:03.242 OC02[1066:303] the red car has 4 wheels
2014-05-31 08:07:03.243 OC02[1066:303]
卡车卸货4吨
2014-05-31 08:07:03.243 OC02[1066:303] the black truck is running at the speed of 10 km/h
2014-05-31 08:07:03.243 OC02[1066:303]
驾驶员小李在驾驶小汽车
2014-05-31 08:07:03.244 OC02[1066:303]
驾驶员小张在驾驶卡车