用Java做一个吃货联盟订餐系统 详细项目实战介绍

public class OrderingMsg {

	public static void main(String[] args) {
		//初始化数据
		//数据主体：一组订单信息
		String[] names = new String[4];         //订餐人姓名
		String[] dishMegs = new String[4];      //所选菜品
		int[] times = new int[4];               //送餐时间
		String[] addresses = new String[4];       //送餐地址
		int[] states = new int[4];               //订单状态：0 已预购 1 已完成
		double[] sumPrices = new double[4];     //总金额
		
		//初始化两个订单信息
		names[0] = "盖伦";
		dishMegs[0] = "红烧带鱼 2份";
		times[0] = 3;
		addresses[0] = "德玛西亚";
		sumPrices[0] = 76.0;
		states[0] = 1;
		
		names[1] = "拉克丝";
		dishMegs[1] = "红烧带鱼 1份";
		times[1] = 10;
		addresses[1] = "德玛西亚";
		sumPrices[0] = 20;
		
		//供选择的菜品信息
		String[] dishNames = {"红烧带鱼","鱼香肉丝","时令蔬菜"};
		//菜品单价
		double[] prices = new double[] {38.0,20.0,10};
		int[] praiseNums = new int[3];
		Scanner input = new Scanner(System.in);
		//用户输入0返回主菜单，否则退出系统
		int num = -1;
		//标记用户是否提出系统 true:退出系统
		boolean isExit = false;
		System.out.println("
欢迎使用吃货联盟系统");
		//循环:显示菜单，根据用户选择，执行响应功能
		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.println("请选择:");
			//记录客户选择功能的编号
		    int choose = input.nextInt();
		    //记录用户选择的功能编号
		    boolean isAdd = false;
		    //找到要签收的订单
		    boolean isSignFind = false;
		    //找到要删除的订单
		    boolean isDelFind = false;
		    //根据用户选择的功能编号执行响应功能
		    switch (choose) {
			
		    case 1:
		    	//我要订餐
				System.out.println("*********我要订餐*********");
				//循环展示菜单
				for (int j = 0; j <names.length; j++) {
					//找到第一个空位置,可以添加订单信息
					if(names[j]==null) {
						//标记位置,可以订餐
						isAdd =true;
						System.out.println("请输入订餐人的姓名:");
						String name = input.next();
						//显示供选择的菜品信息
						System.out.println("序号"+"	"+"菜名"+"	"+"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)+"	"+dishNames[i]+"	"+price+"	"+priaiseNum);
						}
						//用户点菜
						System.out.println("请选择您要点的菜品编号:");
						int chooseDish = input.nextInt();
						System.out.println("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.println("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.println("您输入有误,请输入10~20间的整数!");
						 time = input.nextInt();
					 }
					 System.out.println("请输入送餐地址:");
					 String address =input.next();
					 //无需添加状态,默认是0,即已预订状态.
					 System.out.println("订餐成功!");
					 System.out.println("您订的是:"+dishMeg);
					 System.out.println("送餐时间是:"+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	订餐人	餐品信息		送餐时间		总金额	订单状态");
				for (int i = 0; i < names.length; i++) {
					//查看餐袋中的内容，如果是空就跳出，不在查看
					if (names[i]==null) {
						String state = (states[i]==0)?"已预定":"已完成";
						String data = times[i]+"日";
						String sumPrice = sumPrices[i]+"元";
						System.out.println((i+1)+"	"+names[i]+"	"+dishMegs[i]+"	"+addresses[i]+"	"+sumPrice+"	"+state);
					}
				}
		    	break;
		    case 3:
		    	//签收订单
		    	System.out.println("*********签收订单**********");
		    	System.out.println("请选择要签收的订单序号:");
		    	int signOrder = 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，序号为用户输入订单序号：不可签收
		    		if (names[i]!=null&&states[i]==1&&signOrder==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.println("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 选侯志为用户输入的序号：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[dishMegs.length-1] = null;
						times[names.length] = 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"+"	"+"菜名"+"	"+"单价");
		    	for (int i = 0; i < dishNames.length; i++) {
					String price = prices[i]+"元";
					String praiseNum = (praiseNums[i])>0?praiseNums[i]+"赞":"";
					System.out.println((i+1)+"	"+dishNames[i]+"	"+price+"	"+praiseNum);
				}
		    	System.out.println("请选择您要点赞的菜品序号:");
		    	int praiseNum = input.nextInt();
		    	praiseNums[praiseNum-1]++;   //点赞数+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.println("返回0输出:");
				num = input.nextInt();
			}else {
				break;
			}
        }while (num==0);
		System.out.println("感谢使用，欢迎下次光临");
   }
}