A.封装内部细节,根据需求暴露方法
1 #import <Foundation/Foundation.h> 2 3 @interface Student : NSObject 4 { 5 int age; 6 } 7 8 - (void) setAge:(int) newAge; 9 - (int) age; 10 11 - (void) study; 12 13 @end 14 15 @implementation Student 16 17 - (void) setAge:(int) newAge 18 { 19 if (newAge <= 0) 20 { 21 age = 1; 22 } 23 else 24 { 25 age = newAge; 26 } 27 } 28 29 - (int) age 30 { 31 return age; 32 } 33 34 - (void) study 35 { 36 NSLog(@"%d岁的学生在学习", age); 37 } 38 39 @end 40 41 42 int main() 43 { 44 Student *stu = [Student new]; 45 [stu setAge:21]; 46 [stu study]; 47 48 NSLog(@"这个学生的年龄是%d", [stu age]); 49 50 return 0; 51 }
B.封装规范
使用下划线开头命名实例变量
1 @interface Student : NSObject 2 { 3 int _no; 4 Sex _sex; 5 } 6 7 - (Sex) sex; 8 - (void) setSex:(Sex) newSex; 9 - (int) no; 10 - (void) setNo:(int) no; 11 12 @end
时间: 2024-10-19 05:57:58