双向链表反转

/**
 * 双向链表反转
 */
public class RevertDoubleNode {

    public static class DoubleNode<T> {

        public T value;

        public DoubleNode pre;

        public DoubleNode next;

        public DoubleNode(T node) {
            this.value = node;
        }

    }

    public static DoubleNode revertDoubleNode(DoubleNode node) {
        DoubleNode pre = null;
        DoubleNode next = null;
        while (node != null) {
            next = node.next;
            node.next = pre;
            node.pre = next;
            pre = node;
            node = next;
        }
        return pre;
    }

}