java外卖订餐系统小项目

package 外卖订餐系统;

/*

  * 代码优点，使用 循环：

  *   显示菜单，

  *   根据用户选择的数字执行相应功能(功能实现：do..while循环。)

  */

import java.util.scanner;

public class orderingmsg {

public static void main(string[] args) {

//数据主题，一组订单信息

//声明创建变量

string[] names= new string[ 4 ]; //订餐人名称

string[] dishmegs= new string[ 4 ]; //菜品信息

int [] times= new int [ 4 ];  //送餐时间

string[] addresses= new string[ 4 ]; //送餐地址

int [] states= new int [ 4 ] ; //订餐状态 0：已预订1：已完成

double [] sumprices= new double [ 4 ]; //总额

//供选择的菜品信息

string[] dishnames= { "红烧茄子" , "红烧排骨" , "鱼香肉丝" };  //菜名

double [] prices= new double [] { 24.0 , 36 , 32 }; //菜价

int [] praisenums = new int [ 3 ];

scanner input= new scanner(system.in);

int num = - 1 ; // 用户输入0返回主菜单，否则退出系统

boolean isexit = false ; // 标志用户是否退出系统： true:退出系统

system.out.println( "\n欢迎使用[外卖订餐系统]" );

// 循环：显示菜单，根据用户选择的数字执行相应功能

     do {

       // 显示菜单     

       system.out.println( "****************************" );

       system.out.println( "1、我要订餐" );

       system.out.println( "2、查看餐袋" );

       system.out.println( "3、签收订单" );

       system.out.println( "4、删除订单" );

       system.out.println( "5、我要点赞" );

       system.out.println( "6、退出系统" );

       system.out.println( "****************************" );

       system.out.print( "请选择：" );

       int choose=input.nextint(); //记录用户选择的功能编号

       boolean isadd= false ; //记录用户是否可以订餐

       boolean issignfind= false ; //找到要签收的订单

       boolean isdelfind= false ; //找到要删除签收的订单

      //根据用户选择的功能编号执行响应的功能 

       switch (choose) {

       case 1 :

       // 我要订餐

         system.out.println( "***我要订餐***" );

         for ( int j = 0 ; j < names.length; j++) {         

         if (names[j] == null ){ //找到第一个空位置，可以添加订单信息

         isadd = true ; //置标志位，可以订餐

         system.out.print( "请输入订餐人姓名：" );

         string name = input.next();

        // 显示供选择的菜品信息

         system.out.println( "序号" + "\t" + "菜名" + "\t" + "单价" );

         for ( int i = 0 ; i < dishnames.length; i++) {

         string price = prices[i] + "元" ;

         string priaisenum = (praisenums[i]) > 0 ? praisenums[i] + "赞" : "" ;

         system.out.println((i + 1 ) + "\t" + dishnames[i] + "\t"   +price+ "\t" + priaisenum);

         } 

        // 用户点菜

         system.out.print( "请选择您要点的菜品编号:" );

          int choosedish = input.nextint();

         system.out.print( "请选择您需要的份数:" );

         int number = input.nextint();

         string dishmeg = dishnames[choosedish - 1 ]  + " " + number + "份" ;            

         double sumprice = prices[choosedish - 1 ] * number; 

        //餐费满50元，免送餐费10元

        double delicharge = (sumprice>= 50 )? 0 : 6 ;           

        system.out.print( "请输入送餐时间（送餐时间是10点至20点间整点送餐）:" );

        int time = input.nextint();   

        while (time < 10 || time > 20 ) {

          system.out.print( "您的输入有误，请输入10~20间的整数！" );

          time = input.nextint();

         }

        system.out.print( "请输入送餐地址：" );

        string address = input.next();

       //无需添加状态，默认是0，即已预定状态。

         system.out.println( "订餐成功！" );

         system.out.println( "您订的是：" +dishmeg);

         system.out.println( "送餐时间：" +time+ "点" );

         system.out.println( "餐费：" +sumprice+ "元，送餐费" +delicharge+ "元，总计：" +(sumprice+delicharge)+ "元。" );

         //添加数据

         names[j] = name;

         dishmegs[j] = dishmeg;

         times[j] = time;

         addresses[j] = address;

         sumprices[j] = sumprice+delicharge;

        break ;}}

         if (!isadd){

                 system.out.println( "对不起，您的餐袋已满！" );

              }

          break ;       

       case 2 :

       // 查看餐袋

          system.out.println( "***查看餐袋***" );

         system.out.println( "序号\t订餐人\t餐品信息\t\t送餐日期\t送餐地址\t\t总金额\t订单状态" );

        for ( int i= 0 ;i<names.length;i++){

          if (names[i]!= null ){

          string state = (states[i]== 0 )? "已预定" : "已完成" ;

          string date = times[i]+ "日" ;

               string sumprice = sumprices[i]+ "元" ;

           system.out.println((i+ 1 )+ "\t" +names[i]+ "\t" +dishmegs[i]+ "\t" +date+ "\t" +addresses[i]+ "\t" +sumprice+ "\t" +state);

           }

      }

           break ;

       case 3 :

       // 签收定单

       system.out.println( "***签收定单***" );

         system.out.print( "请选择要签收的订单序号：" );

         int signorderid = input.nextint();

         for ( int i= 0 ;i<names.length;i++){

          //状态为已预定，序号为用户输入的订单序号：可签收

         //状态为已完成，序叼为用户输入胡订单序号：不可签收         

          if (names[i]!= null && states[i]== 0 && signorderid==i+ 1 ){

          states[i] = 1 ; //将状态值置为已完成

          system.out.println( "订单签收成功！" );

          issignfind = true ;

        } else if (names[i]!= null && states[i]== 1 && signorderid==i+ 1 ){

           system.out.println( "您选择的订单已完成签收，不能再次签收！" );

              issignfind = true ;

        }

          }

        //未找到的订单序号：不可签收

        if (!issignfind){

           system.out.println( "您选择的订单不存在！" );

        }  break ;

       case 4 :

       // 删除订单

     system.out.println( "***删除订单***" );

    system.out.print( "请输入要删除的订单序号:" );

       int delid = input.nextint();

          for ( int i= 0 ;i<names.length;i++){

          //状态值为已完成 序号值为用户输入的序号：可删除

         //状态值为已预定 序号值为用户输入的序号：不可删除

        if (names[i]!= null && states[i]== 1 && delid==i+ 1 ){ 

       isdelfind = true ;

        //执行删除操作:删除位置后的元素依次前移

       for ( int j=delid- 1 ;j<names.length- 1 ;j++){

         names[j] = names[j+ 1 ];

         dishmegs[j] = dishmegs[j+ 1 ];

         times[j] = times[j+ 1 ];

         addresses[j] = addresses[j+ 1 ];

         states[j] = states[j+ 1 ];

          }

        //最后一位清空

         names[names.length- 1 ] = null ;

         dishmegs[names.length- 1 ] = null ;

         times[names.length- 1 ] = 0 ;

         addresses[names.length- 1 ] = null ;

         states[names.length- 1 ] = 0 ;

        system.out.println( "删除订单成功！" );

          break ;

       } else if (names[i]!= null && states[i]== 0 && delid==i+ 1 ){

        system.out.println( "您选择的订单未签收，不能删除！" );

        isdelfind = true ;

          break ;

        }

        }

        //未找到该序号的订单：不能删除

         if (!isdelfind){

         system.out.println( "您要删除的订单不存在！" );

       }             

       break ;

       case 5 :

       // 我要点赞

     system.out.println( "***我要点赞***" );

        // 显示菜品信息

        system.out.println( "序号" + "\t" + "菜名" + "\t" + "单价" );

         for ( int i = 0 ; i < dishnames.length; i++) {

          string price = prices[i] + "元" ;

           string priaisenum = (praisenums[i]) > 0 ? praisenums[i]

            + "赞" : "0赞" ;

          system.out.println((i + 1 ) + "\t" + dishnames[i] + "\t"   +price+ "\t" + priaisenum);

        }

        system.out.print( "请选择您要点赞的菜品序号：" );

       int priaisenum = input.nextint();

        praisenums[priaisenum- 1 ]++; //赞数加1

        system.out.println( "点赞成功！" );

          break ;

       case 6 :

       // 退出系统

     isexit = true ;

     break ;

      default :

         //退出系统

         isexit = true ;

       break ;

       }

         if (!isexit) {

        system.out.print( "输入0返回：" );

         num = input.nextint();

       } else {

        break ;

       }            

  } while (num == 0 ) ;

     system.out.println( "谢谢使用，欢迎下次光临！" );

}

}