1基础通过数组、选择结构、循环等实 现吃货联盟订餐系统。
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；
public class Doy001 { public static void main(String[] args) { Scanner input = new Scanner(System.in); String[] names = new String[4]; String[] dishMegs = new String[4]; int[] times = new int[4]; String[] addresses = new String[4]; int[] states = new int[4]; double[] sumPrices = new double[4]; names[0] = "wuli丫头"; dishMegs[0] = "汉堡2份"; times[0] = 12; addresses[0] = "青年路"; sumPrices[0] = 76.0; states[0] = 1; // 第二条订单信息 names[1] = "wuli小仙女"; dishMegs[1] = "脆皮鸡2份"; times[1] = 18; addresses[1] = "石佛营东里"; sumPrices[1] = 45.0; states[1] = 0; // 菜品信息 String[] dishNames = { "汉堡", "脆皮鸡", "柠檬水" }; double[] prices = new double[] { 38.0, 20.0, 10.0 }; int[] praiseNums = new int[3]; int num = -1; boolean flag = false; System.out.println("欢迎使用“吃货联盟订餐系统”"); // 进入循环 do { // 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();// 输入编号 switch (choose) { case 1: System.out.println("****我要订餐****"); boolean isAdd = false; for (int i = 0; i < names.length; i++) { if (names[i] == null) { isAdd = true; System.out.print("请输入订餐人姓名："); String name = input.next(); // 菜品信息 System.out.println("序号" + " " + "菜名" + " " + "单价"); for (int j = 0; j < dishNames.length; j++) { String price = prices[j] + "元"; String praiseNum = (praiseNums[j] > 0) ? praiseNums[j] + "赞" : "0"; System.out.println((j + 1) + " " + dishNames[j] + " " + price); } // 点菜 System.out.print("请您选择要点的菜品编号："); 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; double deliCharge = (sumPrice >= 50) ? 0 : 5;// 满50免送餐费 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("您输入的时间有误，请输入10~20间的整数！"); time = input.nextInt(); } // 订单信息 System.out.print("请输入送餐地址："); String address = input.next(); 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"); names[i] = name; dishMegs[i] = dishMeg; times[i] = time; addresses[i] = address; sumPrices[i] = 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 送餐日期" + " 送餐地址 总金额 订单状态"); for (int i = 0; i < names.length; i++) { if (names[i] != null) { String state = (states[i] == 0) ? "已预订" : "已完成"; String date = times[i] + "日"; String sumPrice = sumPrices[i] + "元"; System.out.println((i + 1) + " " + names[i] + " " + dishMegs[i] + " " + date + " " + addresses[i] + " " + sumPrice + " " + state); } } break; case 3:// 签收订单 System.out.println("****签收订单****"); boolean isSignFind = false;// 找到要签收的订单 System.out.print("请选择要签收的订单序号："); int choose1 = input.nextInt(); for (int i = 0; i < names.length; i++) { if (names[i] != null && states[i] == 0 && choose1 == i + 1) { states[i] = 1; System.out.println("订单签收成功！"); isSignFind = true; } else if (names[i] != null && states[i] == 1 && choose1 == i + 1) { System.out.println("您选择的订单已完成签收，不能再次签收！"); isSignFind = true; } } if (!isSignFind) { System.out.println("您选择的订单不存在！"); } break; case 4:// 删除订单 System.out.println("****签收订单****"); boolean isdelFind = false;// 是否删除找到的订单 System.out.print("请输入要删除的订单序号："); int choose2 = input.nextInt(); for (int i = 0; i < names.length; i++) { if (names[i] != null && states[i] == 1 && choose2 == i + 1) { isdelFind = true;// 已找到订单 // 删除操作，删除后的元素依次后移 for (int j = choose2 - 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]; sumPrices[j] = sumPrices[j + 1]; } // 最后一位清空 int endindex = names.length - 1; names[endindex] = null; dishMegs[endindex] = null; times[endindex] = 0; addresses[endindex] = null; states[endindex] = 0; sumPrices[endindex] = 0; System.out.println("删除订单成功！"); break; } else if (names[i] != null && states[i] == 0 && choose2 == i + 1) { System.out.println("您选择的订单未签收，不能删除！"); isdelFind = true;// 已找到订单 } } 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****"); // 展示菜品信息 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" : "0"; System.out.println((i + 1) + " " + dishNames[i] + " " + price + " " + praiseNum); } System.out.print("请选择您要点赞的菜品序号："); int choose3 = input.nextInt(); praiseNums[choose3 - 1]++; System.out.println("点赞成功！"); break; case 6:// 退出系统 flag = true; break; default: // 退出系统 flag = true; break; } if (!flag) { 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！"); } }