class Node:
def __init__(self, data=None):
self.data = data
self.next = None
class LinkedList:
def __init__(self):
self.head = None
def append(self, data):
new_node = Node(data)
if self.head is None:
self.head = new_node
else:
current = self.head
while current.next is not None:
current = current.next
current.next = new_node
def display(self):
current = self.head
while current is not None:
print(current.data, end=" ")
current = current.next
# 使用示例
llist = LinkedList()
llist.append(1)
llist.append(2)
llist.append(3)
llist.display() # 输出：1 2 3