public class CirDoublyList2 { public DoubleNode head; public CirDoublyList2() { this.head=new DoubleNode(); this.head.prev=this.head; this.head.next=this.head; } public boolean isEmpty() { ...-Go服务器开发

修改循环双链表代码为双链表代码，不进行增加或减少方法，尽量保持原有结构，如下所示：

public class DoublyList<T> {
    public DoubleNode<T> head;

    public DoublyList() {
        this.head = null;
    }

    public boolean isEmpty() {
        return head == null;
    }

    public String toString() {
        String str = this.getClass().getName() + "(";
        for (DoubleNode<T> p = this.head; p != null; p = p.next)
            str += p.data.toString() + ((p.next != null) ? "," : "");
        return str + ")";
    }

    public DoubleNode<T> insert(int i, T x) {
        if (x == null || i < 0)
            return null;
        if (i == 0) { // 在链表头部插入
            DoubleNode<T> q = new DoubleNode<T>(x, null, head);
            if (head != null)
                head.prev = q;
            head = q;
            return q;
        }
        
        DoubleNode<T> front = getNode(i - 1); // 获取第i-1个节点
        if (front == null) // i超出范围
            return null;
        
        DoubleNode<T> q = new DoubleNode<>(x, front, front.next);
        
        if(front.next !=null) // 插入位置非尾部节点
            front.next.prev=q; 
        front.next=q;
        
         return q;
    }

    public DoubleNode<T> insert(T x) {
      return insert(size(), x); // 调用insert方法，在末尾插入元素
    }

    private DoubleNode<T> getNode(int i) {
        if (i >= 0) {
            DoubleNode<T> p = head;
            for (int j = 0; p != null && j < i; j++)
                p = p.next;
            return p;
        }
        return null;
    }

    public int size() {
        int count = 0;
        for (DoubleNode<T> p = head; p != null; p = p.next)
            count++;
        return count;
    }

    // 其他方法...

    public static void main(String[] args) {
        DoublyList<Integer> list1 = new DoublyList<>();
        DoublyList<Integer> list2 = new DoublyList<>();

        for (int i = 6; i <= 10; i++)
            list1.insert(i);

        for (int i = 11; i <= 15; i++)
            list2.insert(i);

        System.out.println(list1.toString());
        System.out.println(list2.toString());

        // 合并两个双链表
        DoublyList<Integer> newList = new DoublyList<>();
        
        // 将list1的元素插入newList
         for(DoubleNode<Integer> p=list1.head;p!=null;p=p.next)
             newList.insert(p.data);
        
         // 将list2的元素插入newList
          for(DoubleNode<Integer> q=list2.head;q!=null;q=q.next)
             newList.insert(q.data);
          
          System.out.println(newList.toString());
      }
}

请注意，上述代码只是将循环双链表改为了双链表，并且添加了合并两个双链表的逻辑。其他方法没有进行增加或删除。

内容由零声教学AI助手提供，问题来源于学员提问