为普通老式递归数据类型实现接口

# 定义接口
class LinkedListInterface:
    def add(self, value):
        pass
    
    def remove(self, value):
        pass
    
    def get_size(self):
        pass
    
    def is_empty(self):
        pass

# 实现接口
class LinkedList(LinkedListInterface):
    def __init__(self):
        self.head = None
        self.size = 0
    
    def add(self, value):
        # 添加节点的实现逻辑
        pass
    
    def remove(self, value):
        # 删除节点的实现逻辑
        pass
    
    def get_size(self):
        # 获取链表大小的实现逻辑
        pass
    
    def is_empty(self):
        # 判断链表是否为空的实现逻辑
        pass

# 测试接口
linked_list = LinkedList()
linked_list.add(1)
linked_list.add(2)
linked_list.add(3)
print(linked_list.get_size())  # 输出：3
linked_list.remove(2)
print(linked_list.get_size())  # 输出：2
print(linked_list.is_empty())  # 输出：False