单链表转置

示意图

代码

public void reverse() {        Node current = first;        Node before = null;        while(current!=null) {            last=before;            before=current;            current = current.next;            before.next = last;        }        current = before;        while (current!=null) {            System.out.println(current.num+" "+current.name);            current = current.next;        }        System.out.println();    }