最近呢，奥密克绒出现了，疫情防控严格起来了，我的线下Java程序课程暂时改成了线上了，这两天上了面向对象，对于零基础的我来说还是比较难的，唉 只能说这个进程的速度我来不及消化，趁着周五复习一下也是很老的吃货联盟订餐项目吧（欢迎有伙伴一起交流哦，尽力而为啦）。
import java.util.Scanner;
public class order02 {
public static void main(String[] args) {
// 扫描器布置，导包！
Scanner scanner = new Scanner(System.in);
// 声明变量
int choice = 0;
int dishNum = 0;
boolean isFull = true;
boolean isFind = true;
boolean isExit = false;
String[] menu = { "红烧鸡翅", "开水白菜", "红烧猪蹄", "农家炒肉" };
double[] price = { 24, 15, 36, 5 };
String[] DishName = new String[4];
int[] copies = new int[4];
String[] names = new String[4];
String[] address = new String[4];
int[] like = new int[4];
int[] times = new int[4];
double[] money = new double[4];
int[] con = new int[4];
// do while 大循环结构包含订餐首页！
do {
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("我要：");
choice = scanner.nextInt();
// 在do-while循环中,利用switch case语句执行不同的功能页.
switch (choice) {
case 1:
System.out.println("*******我要订餐*******");
for (int i = 0; i < names.length; i++) {
if (names[i]== null) {
isFull = false;
System.out.println("请输入订餐人姓名:");
String name = scanner.next();
System.out.println("序号t菜品tt单价t点赞数");
// 利用for循环遍历菜单数组!
for (int j = 0; j < menu.length; j++) {
System.out.println((j+1)+"t"+menu[j]+"t"+price[j]+"t "+like[j]);
}
// 利用dowhile循环判断输入菜品序号是否合法!
do {
System.out.println("请输入1~4之间的整数,选择相应菜品:");
dishNum = scanner.nextInt();
} while ( dishNum > 4||dishNum < 1);
System.out.println("请输入份数:");
int copy = scanner.nextInt();
System.out.println("请输入地址:");
String address1 = scanner.next();
System.out.println("请选择送达时间(输入8-20之间的整数):");
int time = scanner.nextInt();
while ( time>20||time<8) {
System.out.println("请选择送达时间(输入8-20之间的整数):");
time = scanner.nextInt();
}
int deli = (price[dishNum-1]*copy) > 50 ? 0 : 6;
double money1 = price[dishNum-1]*copy+deli ;
System.out.println("订餐成功！");
System.out.println("******订单信息确认******");
System.out.println("您选择的是:"+menu[dishNum-1]+copy+"份.");
System.out.println("您的送餐地址是:"+address1);
System.out.println("送达时间为:"+time);
System.out.println("餐费:"+price[dishNum-1]*copy+",配送费:"+deli+",总金额:"+money1+".");
// 将这些局部变量赋值给开辟好空间的全局变量数组！
DishName[i] = menu[dishNum-1];
names[i] = name;
copies[i] = copy;
address[i] = address1;
times[i] = time;
money[i] = money1;
break;
}
if (isFull) {
System.out.println("对不起，餐袋已满，请删除订单再来订餐！");
}
}
break;
case 2:
System.out.println("*******查看餐袋*******");
// 利用for循环遍历dishName数组！
System.out.println("序号"+"t"+"菜品"+"t"+"t"+"份数"+"t"+"t"+"订餐人"+"t"+"地址"+"t"+"送达时间"+"t"+"总金额"+"t"+"订单状态");
for (int i = 0; i < names.length; i++) {
if (names[i]!= null) {
String state = (con[i] == 0) ? "已预订":"已完成";
System.out.println((i+1)+"t"+DishName[i]+"t"+copies[i]+"份"+"t"+"t"+names[i]+"t"+address[i]+"t"+times[i]+"t"+"t"+money[i]+"t"+state);
}
}
break;
case 3:
System.out.println("*******签收订单*******");
// 首先 要判断输入要签收的订单序号是否合法，其次是订单是否存在，最后订单是否已经被签收。
System.out.println("请输入要签收的订单号：");
int SignNum = scanner.nextInt();
while(SignNum<1||SignNum>4) {
System.out.println("请输入正确的签收订单号：");
SignNum = scanner.nextInt();
}
for (int j = 0; j < con.length; j++) {
if (names[j] != null&&con[j] == 0&& SignNum ==j+1) {
con[j] = 1;
System.out.println("签收成功！");
isFind = false;
break;
}
if (names[j] != null&&con[j] == 1&& SignNum ==j+1) {
System.out.println("该订单已被签收，请勿重复签收");
isFind = false;
break;
}
if (isFind) {
System.out.println("该订单不存在！");
}
}
break;
case 4:
System.out.println("*******删除订单*******");
// 首先判断要删除的订单是否合法，其次判断该订单是否存在，最后判断该订单是否还未被签收。
System.out.println("请输入要删除的订单序号：");
int delNum = scanner.nextInt();
while(delNum<1||delNum>4) {
System.out.println("请输入正确的删除订单号：");
delNum = scanner.nextInt();
}
for (int j = 0; j < names.length;j++) {
if (names[j]!= null&&con[j] == 1&& delNum ==j+1) {
for (int k = delNum -1; k < names.length-1; k++) {
names[k] = names[k+1];
address[k] = address[k+1];
times[k] =times[k+1];
DishName[k] =DishName[k+1];
copies[k] = copies[k+1];
con[k] = con[k+1];
money[k] = money[k+1];
}
names[names.length-1] = "null";
address[names.length-1] = "null";
times[names.length-1] =0;
DishName[names.length-1] ="null";
copies[names.length-1] = 0;
con[names.length-1] = 0;
money[names.length-1] =0;
System.out.println("删除成功！");
isFind = false;
break;
}
if (names[j]!= null&&con[j] == 0&& delNum ==j+1) {
System.out.println("该订单还未被签收，无法删除。");
isFind = false;
break;
}
if (isFind) {
System.out.println("该订单不存在！");
}
}
break;
case 5:
System.out.println("*******我要点赞*******");
System.out.println("序号t菜品tt单价t点赞数");
// 利用for循环遍历菜单数组!
for (int j = 0; j < menu.length; j++) {
System.out.println((j+1)+"t"+menu[j]+"t"+price[j]+"t "+like[j]);
}
System.out.println("请输入要点赞的菜品序号：");
int likeNum = scanner.nextInt();
// while循环判断输入的序号是否合法
while(likeNum<1||likeNum>4) {
System.out.println("请输入正确的点赞订单号：");
likeNum = scanner.nextInt();
}
like[likeNum-1]++;
break;
case 6:
System.out.println("*******退出系统*******");
isExit = true;
break;
default:
System.out.println("*******输入有误，退出系统*******");
isExit = true;
break;
}
if(!isExit) {
System.out.println("请输入0返回");
choice = scanner.nextInt();
}
} while (choice == 0);
// 当choice 这个变量变为0时执行首页这个循环体.
System.out.println("谢谢使用，欢迎下次光临!");
scanner.close();
}
}
里面的双斜杠和斜杠+*所标识的汉字都是我自个的标注，不写进代码不会影响的哦，写的还有些许瑕疵，欢迎伙伴找我讨论相互学习！
