一道关于单链表反转的java代码补全题

请问对于下面的代码，怎样能只在while补全代码，就能使该函数达到单链表反转的效果！请大家帮帮忙！

class Node {
    int data;
    Node next;
}

public Node reverse(Node head) {  
    Node newhead = null;
    Node current = head;
    while (current != null) {

    }
    return newhead; 
}

---

Node next = current.next;
current.next = newhead;
newhead = current;
current = next;