-(void)setName:(NSString *)name andAge:(NSInteger)age{
//实例变量的访问方式
//1.直接访问
_name = name;
_age = age;
//2.间接访问,set方法
[self setName:name];
[self setAge:age];
//3.通过self指针直接访问
self->_name = name;
self->_age = age;
}
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