帶測試函式

package demo2;
class Node {

    int data;
    Node next=null;

    public Node(int data) {
        this.data = data;
    }
}

package demo2;
public class MyLinkedList {
    Node head=null;
    public void addNode(int d){
        Node newNode=new Node(d);
        if(head==null){
            head=newNode;
            return;
        }
        Node tmp=head;
        while (tmp.next!=null){
            tmp=tmp.next;
        }
        tmp.next=newNode;
    }
    public void print(){
        Node tmp=head;
        while (tmp!=null){
            System.out.println(tmp.data);
            tmp=tmp.next;
        }
    }
    public int length(){
        int length=0;
        Node tmp=head;
        while(tmp!=null){
            tmp=tmp.next;
            length++;
        }
        return length;
    }
    public Node FindElem(Node head,int k){
        if(k<=0||k>this.length())
            return null;
        Node p1=head;
        Node p2=head;
        for(int i=0;i<k-1;i++){
            if(p1.next!=null){
                p1=p1.next;
            }else{
                return null;
            }
        }
        while (p1!=null){
            p1=p1.next;
            p2=p2.next;
        }
        return p2.data;
    }
    public static void main(String args[]){
        MyLinkedList list=new MyLinkedList();
        list.addNode(5);
        list.addNode(4);
        list.addNode(3);
        list.addNode(2);
        list.addNode(1)
        list.print();
        System.out.println("===================");
        System.out.println(list.FindElem(head,2));
    }
}
 

以上程式碼有問題，之後再改