pragma mark 構(gòu)造方法練習(xí)

pragma mark 概念

pragma mark 代碼

#import <Foundation/Foundation.h>
#pragma mark 類
#import "Person.h"
#import "Student.h"
#pragma mark main函數(shù)
int main(int argc, const char * argv[])
{
#warning 讓學(xué)生繼承人類,要求學(xué)生對象初始化之后,年齡是10, 學(xué)號是1, 怎么辦?
    
//    Person *p = [[Person alloc]init];
//    NSLog(@"P2 = %@",p);
//    Person *p1 = [[Person alloc]init];
//    NSLog(@"P1 = %@",p1);
    
    Student *stu = [[Student alloc]init];
    NSLog(@"%@",stu);
    
    Student *stu1 = [[Student alloc]init];
    NSLog(@"%@",stu1);

    return 0;
}

Person.h //人類 (父類)

#import <Foundation/Foundation.h>

@interface Person : NSObject

@property int age;
@end

Person.m

#import "Person.h"

@implementation Person

- (instancetype)init
{
    if (self = [super init]) {
        // 如果父類 不等于空
        // 初始化 子類
        _age = 10;
    }
    return self;
}


- (NSString *)description
{
    return [NSString stringWithFormat:@"age = %i",_age];
}
@end

Student.h // 學(xué)生類 (子類)

#import "Person.h"
@interface Student : Person

@property int no; // 學(xué)號
@end

Student.m

#import "Student.h"

@implementation Student

- (instancetype)init
{
    if (self = [super init]) {
//        [self setAge:10];
        _no = 10;
    }
    return self;
}


- (NSString *)description
{
    return [NSString stringWithFormat:@"age = %i, no = %i",[self age],[self no]];
}
@end