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@interface Person : NSObject{    NSString *_name;    NSString *_sex;    int _age;}//setter方法-(void)setName:(NSString *)name;-(void)setSex:(NSString *)sex;-(void)setAge:(int)age;@end@implementation Person//setter方法-(void)setName:(NSString *)name{    _name = name;}-(void)setSex:(NSString *)sex{    _sex = sex;}-(void)setAge:(int)age{    _age = age;}@end@interface Student : Person{    NSString *_studentID;    float _score;}//setter-(void)setStudentID:(NSString *)studentID;-(void)setScore:(float)score;@end@implementation Student : Person//setter-(void)setStudentID:(NSString *)studentID{    _studentID = studentID;}-(void)setScore:(float)score{    _score = score;}@endint main(){    Student *stu = [[Student alloc]init];//开辟空间调用初始化方法    //使用setter方法为实例变量赋值。    [stu setName:@"xiaoA"];    [stu setSex:@"Man"];    [stu setAge:15];    [stu setStudentID:@"2008-07"];    [stu setScore:96];    return 0;}