本项目是作者在学习完Java基础之后练习的一个小项目，如下：

package eat;
import java.util.Scanner;
public class MeiTuan {
	public static void main(String[] args) {
		//首页展示
		Scanner sc=new Scanner(System.in);
		String[]dishes= {"辣子鸡","麻辣龙虾","红烧肉","蒜泥花甲"};
		int[]prices= {38,88,68,48};
		String[][]bills=new String[1024][2];
		System.out.println("****欢迎来到吃货联盟****");
		int chose;
		int []honors=new int[1024];
		do {
			System.out.println("************************");
			System.out.println("1、我要订餐");
			System.out.println("2、查看订单");
			System.out.println("3、确认订单");
			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("************************");
			chose=sc.nextInt();
			switch(chose){
			case 1:
				System.out.println("我要订餐");
				System.out.print("请输入您的姓名：");
				String name=sc.next();
				System.out.println("序号 \t 菜名 \t\t 单价");
				for (int i = 0; i < prices.length; i++) {
					System.out.println(i+1+" \t "+dishes[i]+
                " \t "+prices[i]+"元");
				}
				System.out.print("请输入您要点的菜名：");
				int rank=sc.nextInt();
				System.out.print("请选择份数：");
				int pcs=sc.nextInt();
				System.out.print("请输入配送地址：");
				String address=sc.next();
				int time;
				do {
					System.out.print("请输入您的送餐时间(10-20点整点)：");
					time=sc.nextInt();
					if(time<10 || time>20) {
						System.out.println("不在配送时间，请重新输入！");
					}
				}while(time<10 || time>20);
				int total=prices[rank-1]*pcs;
				total=total>50?total:total+6;//三元表达式
				System.out.println("尊敬的"+name+" 您点了"+pcs+"份"+dishes[rank-1]+
                " 价格为："+total+"元 将于"+time+"点送达，请注意查收！");
				for (int i = 0; i < bills.length; i++) {
					if (bills[i][1]==null) {
						bills[i][0]=dishes[rank-1]+"\t"+pcs+
                        "\t"+total+"\t"+name+"\t"+address+"\t"+time;
						bills[i][1]="已预订";
						break;
					}
					if(i==bills.length-1) {
						System.out.println("订单已满，请下次再来！");
					}
				}
				System.out.print("输入0返回");
				chose=sc.nextInt();
				break;
			case 2:
				System.out.println("查看订单");
				System.out.println
                ("序号 \t 菜名 \t 份数 \t 总价 \t 姓名 \t 地址 \t 时间 \t 状态");
				for (int i = 0; i < bills.length; i++) {
					if(bills[i][1]==null) {
						break;
					}
					System.out.println(i+1+" \t "+bills[i][0]+" \t "+bills[i][1]);
				}
				System.out.print("输入0返回");
				chose=sc.nextInt();
				break;
			case 3:
				System.out.println("确认订单");
				System.out.println
                ("序号 \t 菜名 \t 份数 \t 总价 \t 姓名 \t 地址 \t 时间 \t 状态");
				for (int i = 0; i < bills.length; i++) {
					if(bills[i][1]==null) {
						break;
					}
					System.out.println(i+1+" \t "+bills[i][0]+" \t "+bills[i][1]);
				}
				System.out.print("请输入要确认的订单编号：");
				int confirm=sc.nextInt();
				if(bills[confirm-1][1]==null) {
					System.out.println("订单不存在，订单确认失败！");
				}else if(!bills[confirm-1][1].equals("已预订")) {
					System.out.println("订单已完成，不能重复确认！");
				}else {
					bills[confirm-1][1]="已完成";
					System.out.println("签收成功！");
				}
				System.out.print("输入0返回");
				chose=sc.nextInt();
				break;
			case 4:
				System.out.println("删除订单");
				System.out.println
                ("序号 \t 菜名 \t 份数 \t 总价 \t 姓名 \t 地址 \t 时间 \t 状态");
				for (int i = 0; i < bills.length; i++) {
					if(bills[i][1]==null) {
						break;
					}
					System.out.println(i+1+" \t "+bills[i][0]+" \t "+bills[i][1]);
				}
				System.out.print("请输入要删除的订单编号：");
				int delete=sc.nextInt();
				if(delete<1 || delete>1024) {
					System.out.println("输入错误！");
				}else if(bills[delete-1][1]==null) {
					System.out.println("订单不存在！");
				}else if(!bills[delete-1][1].equals("已完成")) {
					System.out.println("未完成订单不能删除！");
				}else {
					for (int i =delete; i < bills.length; i++) {
						bills[i-1][0]=bills[i][0];
						bills[i-1][1]=bills[i][1];
						if(bills[i][1]==null) {
							break;
						}
					}
				}
				System.out.print("输入0返回");
				chose=sc.nextInt();
				break;
			case 5:
				System.out.println("我要点赞");
				System.out.println("序号 \t 菜名 \t\t 单价 \t 点赞数");
				for (int i = 0; i < dishes.length; i++) {
					System.out.println
                (i+1+" \t "+dishes[i]+" \t "+prices[i]+" 元\t "+honors[i]);
				}
				System.out.println("请输入您要点赞的菜品序号：");
				int honor=sc.nextInt();
				if(honor<1 || honor>dishes.length) {
					System.out.println("输入有误！");
				}else {
					honors[honor-1]++;
					System.out.println
                (dishes[honor-1]+"点赞成功，赞数变味："+honors[honor-1]);
				}
				System.out.println();
				System.out.print("输入0返回");
				chose=sc.nextInt();
				break;
			case 6:
				System.out.println("退出系统");
				break;
			default:
				System.out.println("输入错误！");
				chose=-1;
			}
		}while(chose==0);
		System.out.println("欢迎下次再来！");
	}
}