OC - Method(High)

#import <Foundation/Foundation.h>
#import "Person.h"
#import "Student.h"
#import "CollegeStudent.h"

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

@autoreleasepool {

//Person

Person *per1 = [[Person alloc] initWithName:@"小彩旗" sex:@"女"age:16];

[per1 eat];

[per1 sayHi];

//Student
Student *stu1 = [[Student alloc] initWithName:@"大红旗" sex:@"男" age:18];

[stu1 sleep];
[stu1 sayHi];

[stu1 setName:@"李刚"];
[stu1 setSex:@"真男"];
NSLog(@"%@",[stu1 name]);

//点语法:   相当于代替中括号的方法调用,若没有 set 方法则不可使用点语法
stu1.age = 20;   //等价于[stu1 setAge:20]
NSLog(@"%ld",stu1.age);    //等价于[stu1 age];

//创建 collgestudent
//子类的子类可以获取父类的父类的方法和实例变量(继承具有传递性,且为单向传递)

CollegeStudent *zhangsan = [[CollegeStudent alloc] initWithName:@"zhangsan" sex:@"male" num:@"23" score:2.3];

CollegeStudent *lisi = [[CollegeStudent alloc] initWithName:@"lisi " sex:@"female" num:@"35" score:35.4 major:@"petroleum" school:@"chengoil"];

//对于 sayhi 方法,先从当前类中去找实现,如果没有再到父类中去找,有的话执行;若没有,继续向父类的父类查找有无该方法的实现,一直到找到为止,然后实现.
[lisi sayHi];

//指定初始化方法,,完全初始化
CollegeStudent *aa = [[CollegeStudent alloc]initWithName:@"mmmmmmmmm" num:@"11111111111"];

[aa sayHi];

//便利构造器

Person *per = [Person personWithName:@"ooooo" sex:@"male" age:20];

}
return 0;
}

#import "Person.h"
// : 表示继承
// :Person 表示继承于 Person, 就意味着, Student 获取Person 中所有的实例变量和方法

@interface Student : Person
{
NSString *_num;
CGFloat _score;
}

-(id)initWithName:(NSString *)name
sex:(NSString *)sex
num:(NSString *)num
score:(CGFloat)score;

//setter  and   getter

-(void)setNum:(NSString *)num;
-(NSString *) num;

-(void)setScore:(CGFloat)score;
-(CGFloat)score;

-(void)takeClass;
-(void)exam;

@end

#import "Student.h"

@implementation Student
-(id)initWithName:(NSString *)name
sex:(NSString *)sex
num:(NSString *)num
score:(CGFloat)score
{
if ([super init]) {
_name = name;
_sex = sex;
_num     =num;
_score = score;
}
return self;
}

//setter  and   getter

-(void)setNum:(NSString *)num
{
_num = num;
}
-(NSString *) num
{
return _num;
}

-(void)setScore:(CGFloat)score
{
_score = score;
}
-(CGFloat)score
{
return _score;
}

-(void)takeClass
{
NSLog(@"我是%@,我再上课",[self name]);   //如果想在当前调用实例方法使用 self,self 代表当前类的对象
}

-(void)exam
{
NSLog(@"考试");
}

@end

#import "Student.h"

@interface CollegeStudent : Student
{
NSString *_major;
NSString *_school;
}
-(id)initWithName:(NSString *)name
sex:(NSString *)sex
num:(NSString *)num
score:(CGFloat)score
major:(NSString *)major
school:(NSString *)school;

-(void)setMajor:(NSString *)major;
-(NSString *)major;

-(void)setSchool:(NSString *)school;
-(NSString *)school;

-(void)findObject;
//补考
-(void)makeUpExam;

//重新实现 sayHi
-(void)sayHi;

//指定初始化方法

-(id)initWithName:(NSString *)name
num:(NSString *)num;

-(id)initWithName:(NSString *)name
school:(NSString *)school
major:(NSString *)major;

@end

#import "CollegeStudent.h"

@implementation CollegeStudent

-(id)initWithName:(NSString *)name
sex:(NSString *)sex
num:(NSString *)num
score:(CGFloat)score
major:(NSString *)major
school:(NSString *)school
//{
//    if ([super init]) {
//        _name = name;
//        _sex = sex;
//        _num = num;
//        _score = score;
//        _major = major;
//        _school = school;
//    }
//    return self;
//}

// 这样写就可以不用写_name = name;_sex = sex;_num = num;_score = score;了

{
//super 编译指令,不代表父类对象,调用父类方法的实现!!!!!!!!!

if([super initWithName:name sex:sex num:num score:score]){

_major = major;
_school = school;
}
return self;
}

-(void)setMajor:(NSString *)major
{
_major = major;
}
-(NSString *)major
{
return _major;
}

-(void)setSchool:(NSString *)school
{
_school = school;
}
-(NSString *)school
{
return _school;
}

-(void)findObject
{
NSLog(@" 找对象");
}
//补考
-(void)makeUpExam
{
NSLog(@"补考");
}

-(void)sayHi
{
NSLog(@"%@,%@,%@,%.2f,%@,%@",_name,_sex,_num,_score,_major,_school);
}

//指定初始化方法

-(id)initWithName:(NSString *)name
num:(NSString *)num
{
return [self initWithName:name sex:nil num:num score:0 major:nil school:nil];

}

-(id)initWithName:(NSString *)name
school:(NSString *)school
major:(NSString *)major
{
return [self initWithName:name sex:nil num:nil score:0 major:major school:school];
}

@end

#import <Foundation/Foundation.h>

@interface Person : NSObject

{
NSString *_name;
NSString *_sex;
NSInteger _age;

}

//自定义初始化方法
-(id)initWithName:(NSString *)name
sex:(NSString *)sex
age:(NSInteger )age;

//便利构造器
+(Person *)personWithName:(NSString *)name
sex:(NSString *)sex
age:(NSInteger)age;

-(void)setName:(NSString *)name;
-(NSString *)name;

-(void)setAge:(NSInteger)age;
-(NSInteger)age;

-(void)setSex:(NSString *)sex;
-(NSString *)sex;

-(void)sleep;

-(void)eat;

-(void)playBean;

-(void)sayHi;

@end

#import "Person.h"

@implementation Person

//自定义初始化方法
-(id)initWithName:(NSString *)name
sex:(NSString *)sex
age:(NSInteger )age
{
self = [super init];
if (self) {
_name = name;
_sex = sex;
_age = age;

}
return self;
}

//便利构造器
//以 + 开头  表示类方法 , 返回值类型为当前类, 方法名以当前类名小写开头 + With(W 大写) + 各个参数
//其实就是将创建对象的过程初始化的过程,封装到一个方法里面

+(Person *)personWithName:(NSString *)name
sex:(NSString *)sex
age:(NSInteger)age
{
return [[Person alloc ] initWithName:name sex:sex age:age];

}

-(void)setName:(NSString *)name
{
_name = name;
}
-(NSString *)name
{
return _name;
}

-(void)setAge:(NSInteger)age
{
_age = age;
}
-(NSInteger)age
{
return _age;
}

-(void)setSex:(NSString *)sex
{
_sex = sex;
}
-(NSString *)sex
{
return _sex;
}

-(void)sleep
{
NSLog(@"睡觉");
}

-(void)eat
{
NSLog(@" 吃饭");
}

-(void)playBean
{
NSLog(@" 打豆豆");
}

-(void)sayHi
{
NSLog(@"name %@,sex %@,age %ld",_name ,_sex,_age);
}

@end