public class LinkQueue {
    private class Node{//构造节点内部类
        public String data;
        public Node next;
        public Node(String data,Node next){//初始化全部属性的构造器
            this.data=data;
            this.next=next;
        }
    }
    private Node front;
    private Node rear;
    private int size;
    public LinkQueue(String data){//以指定数据元素来创建链队列，该链队列只有一个元素
        front=new Node(data,null);
        rear=front;
        size++;
    }
    public void add(String data){
        if(front==null){
            front=new Node(data,null);
            rear=front;
        }else{
            Node newNode=new Node(data,null);
            rear=rear.next;
            rear=newNode;
        }
    }
    public String remove(){
        Node oldFront=front;
        front=front.next;
        oldFront.next=null;
        size--;
        return oldFront.data;
    }
    public static void main(String[] args) {
        LinkQueue l=new LinkQueue("A");
        l.add("B");
        l.add("C");
        System.out.println(l.remove());

    }
}