酒店管理系统是一款功能强大、操作简便的酒店管理软件，是酒店进行前台管理、电话预定管理、收银管理、统计查询管理、会员管理、房卡管理、库存管理、报表管理、经理查询、系统维护等的必备工具。要实现这样的系统需要费些功夫，通过java实现简单的功能。

思路：

共有5层，每层10间客房，以数字101--509标示；
具有入住，退房，搜索，退出四个简单功能；
public class Hotel {
static final int floor = 5;
static final int order = 10;
private static int countFloor;
private static int countOrder;
private static String[][] rooms = new String[floor][order];

//main函数代表酒店的基本功能，入住，退房，查询，其他；public static void main(String[] args) { Scanner scan = new Scanner(System.in); String temp = null; while(true){ //提醒用户选择输入 System.out.println("请选择输入 in out search quit : "); temp = scan.next(); int room = 0; if("in".equals(temp)){ while(true){ System.out.println("请输入房间号："); room = scan.nextInt(); if(isRightRoom(room,1)){ break; } } System.out.println("请输入名字:"); String name = scan.next(); if(in(room,name)){ System.out.println("恭喜您，入住成功"); System.out.println(room + " : "+name); } }else if("out".equals(temp)){ while(true){ System.out.println("请输入房间号："); room = scan.nextInt(); if(isRightRoom(room,0)){ break; } } if(out(room)){ System.out.println("退房成功，欢迎下次光临"); } }else if("search".equals(temp)){ System.out.println("请输入查询的房间号(-1表示全部)"); room = scan.nextInt(); search(room); }else if("quit".equals(temp)){ break; }else{ System.out.println("您的输入有误，请再次输入！"); } }}//flag:1 检查房间号输入正确 且 无人入住 0 仅检查房间号输入正确private static boolean isRightRoom(int room,int flag) { //校验房间号是否输入有误 countFloor = room / 100 - 1; countOrder = room % 100 - 1; if(countFloor < 0 || countFloor >= floor || countOrder < 0 || countOrder >= order ){ System.out.println("输入的房间号有误"); return false; } if(flag == 1){ if(rooms[countFloor][countOrder] != null){ System.out.println("房间已经入住"); return false; } } return true;}//旅馆入住功能实现，in(room,name) countFloor:计算出的楼层 countOrder:计算出的房间顺序 private static boolean in(int room,String name){ rooms[countFloor][countOrder] = name; return true;}//旅馆退房功能实现,out(room),private static boolean out(int room){ //校验房间号是否有人入住 if(rooms[countFloor][countOrder] == null){ System.out.println("房间未曾入住，退房有误"); return false; } rooms[countFloor][countOrder] = null; return true;}//旅馆搜索功能，search(room)private static void search(int room){ if(room == -1){ int roomNum = 0; for(int i=0;i<floor;i++){ for(int j=0;j<order;j++){ roomNum = (i + 1) * 100 + j + 1; System.out.println(roomNum + "->" + (rooms[i][j] == null ? "empty" : rooms[i][j])); } } }else{ //校验房间号是否正确 if(!isRightRoom(room,0)){ System.out.println("抱歉，房间输入错误！"); }else{ System.out.println(rooms[countFloor][countOrder]); } }}}