java初学小项目-酒店客房管理系统

最近初次接触JAVA，感觉之前学的C语言很有用，跟着视频做了一个小项目-酒店客房管理系统

/*
酒店客房管理系统
*/
import java.util.Scanner;//通过键盘来输入命令需要的引入

class HotelManangerSystem
{
    public static void main(String[] args)
    {
        //酒店有12个楼层，每层有10个房间
        //字符串数组如果没有被初始化，每个元素都是null
        String[][] rooms = new String[12][10];
        System.out.println("欢迎来到蒋氏集团大酒店");//换行打印
        System.out.println("请输入要操作的命令：search查询，in办理入住，out退房"
                           + "init初始化所有房间");
        Scanner s = new Scanner(System.in);//这个在主函数定义的，其他函数用不了
        
        while(true)
        {
            String command = s.next();//提示输入命令
            //比较字符串相同--"输入的字符串".equals(command)
            if("init".equals(command))
            {
                init(rooms);
                System.out.println("房间初始化完毕");
            }
            else if("search".equals(command))
            {
                search(rooms);
            }
            else if("in".equals(command))
            {
                in(rooms);
            }
            else if("out".equals(command))
            {
                out(rooms);
            }
        }
        
        
    }
    //初始化所有的房间号
    public static void init(String[][] rooms)
    {
        for(int i = 0; i < 12; i++)
        {
            for(int j = 0; j < 10;j++)
            {
                rooms[i][j] = "EMPLY";
            }
        }
    }
    public static void search(String[][] rooms)
    {
        for(int i = 0; i < rooms.length; i++)
        {
            for(int j = 0; j < rooms[i].length;j++)
            {
                if(i < 9)
                {
                    System.out.print("0");
                }
                int roomNum = (i + 1) * 100 + j + 1;
                System.out.print(roomNum + "	");
            }
            System.out.println();
            for(int k = 0; k < rooms[i].length; k++)
            {
                System.out.print(rooms[i][k] + "	");
            }
            System.out.println();
        }
    }
    public static void in(String[][] rooms)
    {
        System.out.println("请输入房间号：");
        Scanner s = new Scanner(System.in);
        int roomNum = s.nextInt();
                int i = roomNum / 100;
        int j = roomNum % 100;
        if(i < 1 || i > 10 || j < 1|| j > 12)
        {
            System.out.println("输入错误，请重新输入in：");
            return;
        }
        if(rooms[i-1][j-1] != "EMPLY")
        {
            System.out.println("此房间已经有人入住，请重新输入in：");
            return;
        }
        System.out.println("请输入您的姓名：");
        String name = s.next();
        rooms[i-1][j-1] = name;    
        System.out.println("入住成功");        
    }
    public static void out(String[][] rooms)
    {
        System.out.println("请输入房间号：");
        Scanner s = new Scanner(System.in);
        int roomNum = s.nextInt();
                int i = roomNum / 100;
        int j = roomNum % 100;
        if(i < 1 || i > 10 || j < 1|| j > 12)
        {
            System.out.println("输入错误，请重新输入out：");
            return;
        }
        if(rooms[i-1][j-1] == "EMPLY")
        {
            System.out.println("输入错误，请重新输入out：");
            return;
        }
        if(rooms[i-1][j-1] != "EMPLY")
        {
            rooms[i-1][j-1] = "EMPLY";
            System.out.println("退房成功");
        }
        
    }
}