黑马程序员_类的合理设计_基本的属性&对象类型的属性



黑马程序员_类的合理设计_基本的属性&对象类型的属性

一、类的合理设计之基本的属性

类的合理设计1_基本的属性/*  学生  成员变量：性别、生日、体重、最喜欢的颜色、狗  方法: 吃、跑步、遛狗、喂狗 */#import <Foundation/Foundation.h>typedef enum {SexMan,SexWoman} Sex;typedef struct {int year;int month;int day;} Date;typedef enum {ColorBlack;ColorRed;ColorGreen} Color;@interface Student : NSObject{@publicSex sex;// 性别Date birthday;// 生日double weight;// 体重(kg)Color favColor;// 最喜欢的颜色char *name;}- (void)eat;- (void)run;- (void)print;@end@implementation Student- (void)eat{weight += 1;// 每吃一次，体重就加1NSLog (@"吃完这次后的体重是%f", weight);}- (void)run{weight -= 1;// 跑一次，体重减1NSLog (@"跑完这次后的体重是%f", weight);}- (void)print{NSLog (@"性别= %d, 喜欢的颜色 = %d, 姓名 = %s, 生日 = %d-%d-%d",sex, favcolor, name, birthday.year, birthday.month, birthday.day);}@endint main(){Student *s = [Student new];s->weight = 50;// 性别s->sex = SexMan;// 生日/*// s->birthday = {2011, 9, 10};// 在定义结构体变量的时候才可以初始化。s->birthday.year = 2011;s->birthday.month = 9;s->birthday.day = 10; */Date d = {2011, 9, 10};s->birthday = d;// 姓名s->name = "Jack";// 颜色s->favColor = ColorBlack;[s print];return 0;}

二、类的合理设计之对象类型的属性

类的合理设计2_对象类型的属性/*  学生  成员变量：性别、生日、体重、最喜欢的颜色、狗（体重、毛色、吃、跑）  方法: 吃、跑步、遛狗（让狗跑）、喂狗（让狗吃） */#import <Foundation/Foundation.h>typedef enum {SexMan,SexWoman} Sex;typedef struct {int year;int month;int day;} Date;typedef enum {ColorBlack;ColorRed;ColorGreen} Color;@interface Dog : NSObject{@publicdouble weight;// 体重Color curColor;// 毛色}- (void)eat;- (void)run;@end@implementation Dog- (void)eat{weight += 1;// 每吃一次，体重就加1NSLog (@"狗吃完这次后的体重是%f", weight);}- (void)run{weight -= 1;// 跑一次，体重减1NSLog (@"狗跑完这次后的体重是%f", weight);}@end@interface Student : NSObject{@publicSex sex;// 性别Date birthday;// 生日double weight;// 体重(kg)Color favColor;// 最喜欢的颜色char *name;// 重点：狗Dog *dog;}- (void)eat;- (void)run;- (void)print;- (void)liuDog;- (void)weiDog;@end@implementation Student- (void)liuDog{// 让狗跑起来（调用狗的run方法）[dog run];}- (void)weiDog{// 让狗吃东西（调用狗的eat方法）[dog eat];}- (void)eat{weight += 1;// 每吃一次，体重就加1NSLog (@"学生吃完这次后的体重是%f", weight);}- (void)run{weight -= 1;// 跑一次，体重减1NSLog (@"学生跑完这次后的体重是%f", weight);}- (void)print{NSLog (@"性别= %d, 喜欢的颜色 = %d, 姓名 = %s, 生日 = %d-%d-%d",sex, favcolor, name, birthday.year, birthday.month, birthday.day);}@endint main(){Student *s = [Student new];Dog *d = [Dog new];d->curColor = ColorGreen;d->weight = 20;// 创建一个Dog对象给Student对象s->dog = d;[s liuDog];[s weiDog];return 0;}void test(){Student *s = [Student new];s->weight = 50;// 性别s->sex = SexMan;// 生日/*// s->birthday = {2011, 9, 10};// 在定义结构体变量的时候才可以初始化。s->birthday.year = 2011;s->birthday.month = 9;s->birthday.day = 10; */Date d = {2011, 9, 10};s->birthday = d;// 姓名s->name = "Jack";// 颜色s->favColor = ColorBlack;[s print];}