JAVA40 排队系统

描述

请设计一个排队程序，用户有普通客人和VIP客人之分，VIP客人不排队（即VIP客人在队列头部），目前队列中已有两位客人小明和小军在排队，请将VIP客人小红新增至队列头部。
 

输入描述：

无
 

输出描述：

预设代码中已经指定输出

 

分析：

​ 1.把vip客户调整至队列头。

 

代码：

import java.util.*;public class Main {public static void main(String[] args) {Guest guest1 = new Guest("小明",false);Guest guest2 = new Guest("小军",false);Guest vipGuest = new Guest("小红",true);Deque<Guest> deque = new ArrayDeque<>();deque.add(guest1);deque.add(guest2);//write your code here......deque.addFirst(vipGuest);System.out.println(deque);}
}
class Guest{String name;Boolean vip;@Overridepublic String toString() {return name;}public Guest(String name, Boolean vip) {this.name = name;this.vip = vip;}
}

 
 

JAVA41 Head and Tail of the Queue（队列的头和尾）

描述

Students are picked from a group of students to give speeches. To be fair, the head and tail of the queue are drawn alternately. Please implement the process of leaving the queue through the program.(学生是从一群学生中挑选出来发表演讲的。公平地说，队列的头和尾是交替绘制的。请通过程序执行离开队列的过程。)
 

输入描述：

A group of students’ names
 

输出描述：

Print the names of the students at the head and tail of the queue alternately.(交替打印排在队伍最前面和最后面的学生的名字。)

示例:

输入：Tom Jim Lily Lucy Mary
输出：TomMaryJimLucyLily

 

分析：

​ 1.队列的输出和删除。

 

代码：

import java.util.ArrayDeque;
import java.util.Scanner;public class Main {public static void main(String[] args) {ArrayDeque deque = new ArrayDeque();Scanner scanner = new Scanner(System.in);while (scanner.hasNext()) {String name = scanner.next();// 初始化队列中的数据deque.offerLast(name);}while(deque.size()>=2){//输出并删除队头元素System.out.println(deque.pollFirst());//输出并删除队尾元素System.out.println(deque.pollLast());}if(deque.size()==1){System.out.println(deque.pollFirst());}}}

 

大佬代码：

import java.util.ArrayDeque;
import java.util.Scanner;public class Main {public static void main(String[] args) {ArrayDeque deque = new ArrayDeque();Scanner scanner = new Scanner(System.in);while (scanner.hasNext()) {String name = scanner.next();// 初始化队列中的数据deque.offerLast(name);}//只要队列大小大于2，不断从队头队尾打印学生名字while(deque.size()>=2){System.out.println(deque.pollFirst());System.out.println(deque.pollLast());}//如果队列中还有学生，则必定只有一个学生，直接打印其名字if(deque.size()>0){System.out.println(deque.pollFirst());}}}