int arr[]={1,2,34,5,8,65};
        Node link=new Node();
        for(int i:arr){
            Node x=new Node();
            x.value=arr[i];
            x.next=link;
            link=x;
        }
        //头插

int arr[]={1,2,34,5,8,65};
       Node link=new Node();
       link.value=arr[0];
       Node flag=link;
       for(int i=1;i<arr.length;i++){
            Node x=new Node();
            x.value=arr[i];
            flag.next=x;
            flag=flag.next;
        }
       //尾插

public class Node {
    public int value;
    public Node next;

    @Override
    public String toString() {
        return value +
                "===>" + next
                ;
    }
}