OC - Method(High)
<main.m>
#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;
}
<Student.h>
#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
<Student.m>
#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
<CollegeStudent.h>
#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
<CollegeStudent.m>
#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
<Person.h>
#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
<Person.m>
#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