doubly linked list get first and last element?

dear all ,i want to write two diffirent method for doubly linked list , one for get first element and the second ont to get the las element i try with these code but it give me an error

package doublelinked;

public class doublee {

int size =0;

Node head = null;

Node tail = null;

class Node{

int data;

Node next;

Node previous;

public Node(int data){

this.data = data;

next = null;

previous = null;

}

}

public Node addAtStart(int data){

System.out.println("Adding Node " + data + " at the start");

Node n = new Node(data);

if(size==0){

head = n;

tail = n;

}else{

n.next = head;

head.previous = n;

head = n;

}

size++;

return n;

}

public Node addAtEnd(int data){

System.out.println("Adding Node " + data + " at the End");

Node n = new Node(data);

if(size==0){

head = n;

tail = n;

}else{

tail.next = n;

n.previous = tail;

tail =n;

}

size++;

return n;

}

public node getfirst();

if(isEmpty()) return null;

return head.getNext;

}public node getlast();

if(isemty(()) return null;

return tail.getNext;

}