Java教程

Java创建n个节点的循环链接列表并以相反顺序显示

在此程序中,我们创建一个循环链接列表,然后反向遍历该列表排序并打印节点。

算法

定义一个代表列表中节点的Node类。它有两个属性数据,下一个将指向下一个节点。 定义另一个用于创建循环链表的类,它具有两个节点: head和tail。它有两种方法: add(),display()和reverse()。 add()将节点添加到列表中: 首先检查head是否为空,然后将节点插入为head。 头部和尾部都将指向新添加的节点。 如果head不为null,则新节点将是新尾,并且新尾将指向head,因为它是一个循环链表。
a.display()将显示列表中存在的所有节点。
定义一个新节点"当前",该节点将指向头部。 打印current.data直到电流再次指向头。 当前每次迭代将指向列表中的下一个节点。
a.reverse()将以相反的顺序打印循环链接列表。
此方法检查当前节点的下一个节点是否为head,这表示当前节点指向尾部,然后将打印该尾节点的数据。 通过考虑当前节点旁边的节点来递归调用reverse(),并从尾部开始以相反顺序打印所有节点。

程序:

public class ReverseList {
    //Represents the node of list.
            public class Node{
        int data;
        Node next;
        public Node(int data) {
            this.data = data;
        }
    }
    //Declaring head and tail pointer as null.
            public Node head = null;
    public Node tail = null;
    //this function will add the new node at the end of the list.
            public void add(int data){
        //Create new node
                Node newNode = new Node(data);
        //Checks if the list is empty.
                if(head == null) {
            //if list is empty, both head and tail would point to new node.
                    head = newNode;
            tail = newNode;
            newNode.next = head;
        }
        else {
            //tail will point to new node.
                    tail.next = newNode;
            //New node will become new tail.
                    tail = newNode;
            //Since, it is circular linked list tail will point to head.
                    tail.next = head;
        }
    }
    //Displays all the nodes in the list
            public void display() {
        Node current = head;
        if(head == null) {
            System.out.println("List is empty");
        }
        else {
            do{
                //Prints each node by incrementing pointer.
                        System.out.print(" "+ current.data);
                current = current.next;
            }
            while(current != head);
            System.out.println();
        }
    }
    //Reverse the order of the nodes present in the list.
            public void reverse(Node current) {
        //Checks if the next node is head, if yes then prints it.
                if(current.next == head) {
            System.out.print(""+current.data);
            return;
        }
        //Recursively calls the reverse function
                reverse(current.next);
        System.out.print(""+current.data);
    }
    public static void main(String[] args) {
        ReverseList cl = new ReverseList();
        cl.add(1);
        cl.add(2);
        cl.add(3);
        cl.add(4);
        cl.add(5);
        cl.add(6);
        System.out.println("Original List: ");
        cl.display();
        System.out.println("Reversed List: ");
        //Print reversed list
                cl.reverse(cl.head);
    }
}
输出:
Original List:
1 2 3 4 5 6
Reversed List:
6 5 4 3 2 1
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