#import<Foundation/Foundation.h>
@interface Animal : NSObject {
    int _leg;
    int _eye;
}
+(void) Run ;
+(void) eat ;
-(void) setLeg : (int)leg ;
-(void) setEye : (int)eye ;
@end

@implementation Animal
+(void) Run{
    NSLog(@"跑了........");
}
+(void) eat{
    NSLog(@"吃了.......");
}
-(void) setLeg : (int)leg{
    _leg = leg ;
}
-(void) setEye : (int)eye {
    _eye = eye ;
}
@end
@interface Dog : Animal
+(void)kanMen;
+(void)Bite;
@end
@implementation Dog
+(void)kanMen{
    NSLog(@"狗开门了........");
}
+(void)Bite{
    NSLog(@"狗咬人了.........");
}
@end
@interface Cat : Animal


+(void)Climb;
@end
@implementation Cat
+(void)Climb{
    NSLog(@"猫爬树了.....");
}

@end
int main(){
   
    [Dog Run];
    [Cat Run];
    [Dog eat];
    [Cat eat];
    [Dog kanMen];
    [Dog Bite];
    [Cat Climb];
   
    return 0;
}

可以的，然而我现在还是有点搞不懂类方法和对象方法