public class LinkedList implements List {
	
	protected static class ListNode implements List.Node {
		  public int data;     
		  public ListNode next; 
		  public int getData() { return data; }
		  ListNode() {
			  data = 0;
		  }
		  ListNode (int x) {
			  data = x;
		  }
		}
	
	int laenge = 0;
	ListNode head = new ListNode();
	ListNode tail = new ListNode();
	
	LinkedList() {
		head.next = tail;
		tail.next = null;
	}

	public void add(int a) {
		ListNode ln = new ListNode(a);
		head.next = ln;
		
		
		
	}