One of the small practical projects - food alliance ordering system

系统概述：

1. 我要订餐
2. 查看餐袋
3. 签收订单
4. 删除订单
5. 我要点赞
6. 退出系统

 

 下面是实例代码：

import java.util.Scanner;

public class OrderFoodSys {

	public static void main(String[] args) {
//		Define the data subject：订单   菜品
		String[] dishNames ={"红烧带鱼","鱼香肉丝","时令蔬菜"};//菜品名称
		double[] prices = {38.0,20.0,10.0};//The unit price of the dish
		int[] praiseNums = new int[3];//点赞数
//		Define the data subject： 订单-订餐人    餐品信息    送餐时间    送餐地址   总金额  订单状态
		 String[] names = new String[4];
		 String[] dishMsg = new String[4];//菜品名称+number of copies
		 int[] times = new int[4];
		 String[] adresses = new String[4];
		 double[] sumPrices = new double[4];
		 int[] states = new int[4];//0：已预定 1：已完成
		 
//		 初始化2个订单信息
		 names[0]="张三";
		 dishMsg[0]="红烧带鱼 2份";
		 times[0]=10;
		 adresses[0]="知春路223号";
		 sumPrices[0]=76;//餐费》50免费送,不然,配送费6元
		 states[0]=0;
		 
		 names[1]="李四";
		 dishMsg[1]="鱼香肉丝 1份";
		 times[1]=13;
		 adresses[1]="天成路207号";
		 sumPrices[1]=26;//餐费》50免费送,不然,配送费6元
		 states[1]=1;
		 
//		 Build the overall process framework of the project
		 Scanner input = new Scanner(System.in);
		 int num = -1;//用户输入0The input number on return,num=0The main menu is displayed repeatedly;numPrompt for re-assignment after each ordering operation of the user
//		 System.out.println("欢迎使用“吃货联盟订餐系统”");
		 System.out.println("欢迎使用\"Foodie alliance system\"");
		 boolean flag=false;//ture 退出 flase 不退出
		 
		 do{
			 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();
			 switch(choose){
			 	case 1:
			 		System.out.println("\n******我要订餐***********");
			 		//The premise of the order is that the order is not full,booleanvariable to identify the result of whether the order is full,满了falseNot available for order
			 		boolean isAdd = false;
			 		for (int i = 0; i < names.length; i++) {
						if(names[i]==null){
							//订单未满,可以订餐
							isAdd = true;
							//订餐.
							System.out.print("请输入订餐人姓名：");
							String name = input.next();
							//Loop output dish information
							System.out.println("序号\t菜品\t单价");
							for(int j =0;j<dishNames.length;j++){
								String praise =(praiseNums[j]==0)?"":praiseNums[j]+"赞";
								System.out.println((j+1)+"\t"+dishNames[j]+"\t"+prices[j]+"\t"+praise);
							}
							//Input and judgment of dish number
								System.out.print("请输入您要点的菜品编号：");
								int no = input.nextInt();
								while(no<1||no>dishNames.length){
									System.out.print("This restaurant does not have this dish,请重新选择：");
									no=input.nextInt();
								
								}
								//Number of servings
								System.out.print("Please enter the number of copies you want：");
								int number = input.nextInt();
								//Input and judgment of meal delivery time
								System.out.print("请输入送餐时间（Meal delivery hours are only available10-20the whole point in between）:");
								int time = input.nextInt();
								while(time <10|| time>20){
									System.out.println("您输入有误,请输入10-20之间的整数：");
									time = input.nextInt();
								}
								//送餐地址
								System.out.print("请输入送餐地址：");
								String address = input.next();
								//added to the order,Output order information to the user
								System.out.println("订餐成功！");
								//菜品信息：菜品名称 份数
								String dishInfo = dishNames[no-1]+" "+number+"份";
								System.out.println("您订的是："+dishInfo);
								System.out.println("送餐时间："+time+"点");
								//餐费  配送费  总计
								//餐费 prices数组下标 than the user chooses The number of dishes is small1
								double dishPrice = prices[no-1]*number;
								double peiSong = (dishPrice>50)?0:6;
								double sumPrice = dishPrice +peiSong;
								System.out.println("餐费："+dishPrice+"元; 配送费："+peiSong+";总计："+sumPrice+"元");
								//Add order information to order information,Where the order is inserted is key:i
								names[i]=name;
								dishMsg[i]=dishInfo;
								times[i]=time;
								adresses[i]=address;
								sumPrices[i]=sumPrice;
								// 
								break;
								}
						}
						if(!isAdd){
							System.out.println("对不起,您的餐袋已满！");
						}
					
			 		break;
			 		
			 	case 2:
			 		System.out.println("\n******查看餐袋***********");
			 		System.out.println("序号\t订餐人\tOrder food\t\t配送时间\t配送地址\t\tOrder amount\t订单状态");
			 		for (int i = 0; i < names.length; i++) {
						if(names[i]!=null){
							String time = times[i]+"点";
							String state = (states[i]==0)?"已预定":"已完成";
							System.out.println((i+1)+"\t"+names[i]+"\t"+dishMsg[i]+"\t"+time+"\t"+adresses[i]+"\t"+sumPrices[i]+"\t"+state);
						}
					}
			 		break;
			 	case 3:
			 		System.out.println("\n******签收订单***********");
			 		//before signing,First determine whether the order exists,boolean
			 		//false 不存在,Can not sign：true-存在,and predetermined status,Can sign;存在,完成状态,Can not sign
			 		boolean isSign = false;
			 		System.out.println("Enter the order number you want to sign for：");
			 		int signNo = input.nextInt();
			 		for(int i = 0;i<names.length;i++){
			 			if(names[i]!=null&&states[i]==0&&i==signNo-1){
			 				//有订单信息,And the order number entered by the user I can find
			 				isSign = true;
			 				//And the order status is booked,Can sign
			 				states[i]=1;
			 				System.out.println("订单签收成功！");
			 			}
			 			else if(names[i]!=null&&states[i]==1 && i==signNo-1){
			 				//有订单信息,And the order number entered by the user I can find
			 				isSign=true;
			 				//But the order status is completed,Can not sign
			 				System.out.println("您选择的订单已经完成签收,不能再次签收！");
			 			}
			 		}
			 		if(!isSign){
			 			System.out.println("您选择的订单不存在！");
			 		}
			 		break;
			 	case 4:
			 		System.out.println("\n******删除订单***********");
			 		//删除之前,First determine whether the order exists,boolean
			 		//false 不存在,不能删除：true-存在,and predetermined status,不能删除;存在,完成状态,能删除
			 		boolean isDelete = false;
			 		System.out.print("Enter the order number you want to delete：");
			 		int deleteNo = input.nextInt();
			 		for(int i = 0;i<names.length;i++){
			 			if(names[i]!=null&&states[i]==0&&i==deleteNo-1){
			 				//有订单信息,And the order number entered by the user I can find
			 				isDelete = true;
			 				//And the order status is booked,不能删除
			 				
			 				System.out.println("您选择的订单未签收,不能删除！");
			 			}
			 			else if(names[i]!=null && states[i]==1 && i==deleteNo-1){
			 				//有订单信息,And the order number entered by the user I can find
			 				isDelete=true;
			 				//But the order status is completed,能删除
			 				//Find the delete order position subscripti,把iSubsequent elements move forward accordingly,最后一个元素置空
			 				//注意：The process of moving is actually the process of copying the next element to the previous element
			 				//The last element must be left blank,Leave empty to place a new order
			 				for (int j = i; j < names.length-1; j++) {
			 					names[j]=names[j+1];
			 					dishMsg[j]=dishMsg[j+1];
			 					times[j]=times[j+1];
			 					adresses[j]=adresses[j+1];
			 					sumPrices[j]=sumPrices[j+1];
			 					states[j]=states[j+1];
							}
			 				names[names.length-1]=null;
		 					dishMsg[names.length-1]=null;
		 					times[names.length-1]=0;
		 					adresses[names.length-1]=null;
		 					sumPrices[names.length-1]=0;
		 					states[names.length-1]=0;
		 					
		 					System.out.println("删除订单成功！");
			 			}
			 		}
			 		if(!isDelete){
			 			System.out.println("您选择的订单不存在！");
			 		}
			 		break;
			 	case 5:
			 		System.out.println("\n******我要点赞***********");
			 		//Loop output dish information
			 		System.out.println("序号\t菜名\t单价");
			 		for (int j = 0; j < dishNames.length; j++) {
						String praise=(praiseNums[j]==0)?"":praiseNums[j]+"赞";
						System.out.println((j+1)+"\t"+dishNames[j]+"\t"+praise);
					}
			 		//点赞
			 		System.out.println("请输入您要点赞的菜品序号：");
			 		int praiseNo= input.nextInt();
			 		while(praiseNo<1||praiseNo>dishNames.length){
			 			System.out.print("This restaurant does not have this dish,Can't like！Please re-enter a dish number：");
			 			praiseNo = input.nextInt();
			 		}
			 		//关键点：Add the number of likes to the dishes at that location1
			 		praiseNums[praiseNo-1]++;
			 		break;
			 	case 6:
			 		flag = true;
			 		break;
			 	default:
			 		flag = true;
			 		break;
			 		
			 }
			 if(!flag){//!flag 等同于 flag==false
			 System.out.print("请输入0返回:");
			 num = input.nextInt();
			 }else{
				 break;
			 }
			 
		 }while(num==0);
		 System.out.println("谢谢使用,欢迎下次光临!");
		 
	}

}