//单链表
public class ListNode{
//节点的值
int val;
//下一个节点
ListNode nest;
//节点的构造函数(无参)
public ListNode(){
}
//节点的构造函数(一个参数)
public ListNode(int val){
this.val = val;
}
//节点的构造函数(两个参数)
public ListNOde(int val, ListNOde next){
this.val = val;
this.next = next;
}
}
参考代码随想录
https://www.programmercarl.com/%E9%93%BE%E8%A1%A8%E7%90%86%E8%AE%BA%E5%9F%BA%E7%A1%80.html