package moumoumou.xxx
class Node {
    public int val;
    public Node next; // 对象为Node类的next 变量
    public Node (int val){
        this.val = val; //Java的语法，this表示Node对象里的(属性等)
    }
}
public class Main {
    psvm(String[] args){
        // init
        Node head = new Node(1); //任意建了一个值为1的头节点
        Node head.next = new Node(2);
        Node head.next.next = new Node(3);
        Node head.next.next.next = new Node(4);

        // 遍历
        for (int p = head; p != null; p=p.next){
            // 做些事
            System.out.println(p.val);
        }
    }
}

后续TBC