【Java】KFC点餐系统（储值卡创建+小票打印+周末会员打折）

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代码都写得很简单，用的都是一些通俗易懂的方法：

Main.java

import java.io.IOException;
ParseException;
import java.util.Scanner;public class Main {static Scanner sc = new Scanner(System.in);public static void main(String[] args) throws IOException, InterruptedException, ParseException {Order o = new Order();Menu();o.HaveOrder();o.Print();}public static void Menu() {		//KFC主菜单System.out.println("--------------欢迎光临KFC---------------");System.out.println("-------------以下是菜单列表-------------");System.out.println("------1.快乐儿童餐   ->  价格:9.99RMB----");System.out.println("------2.吮指原味鸡   ->  价格:14.99RMB----");System.out.println("------3.香辣炸鸡餐   ->  价格:19.99RMB----");System.out.println("------4.可乐（大）   ->  价格:4.99RMB----");System.out.println("------5.超值双人餐   ->  价格:39.99RMB----");System.out.println("---------------0.完成点餐--------------");System.out.println("---------------8.退出菜单--------------");System.out.println("---------------9.会员通道--------------");System.out.println("---------------------------------------");System.out.println("----------请输入你的菜单序号:----------");}
}

Order.java

import java.io.*;
import java.math.BigDecimal;
*;
import java.util.*;
public class Order {static ArrayList<String> arr = new ArrayList<String>();static Scanner sc = new Scanner(System.in);public float money = 0;	//商品价格public float payMoney = 0;	//支付钱数public float backMoney = 0;	//找零public String String_backMoney;	//正常支付时的找零的字符串表示，用以解决货币显示错误的问题public int OffNumber = 0;	//使用优惠券的代码public boolean weekendOff = false;	//是否周末折扣日public boolean paywithcard = false; //是否用储值卡支付Card card = new Card();public void HaveOrder() throws IOException, InterruptedException, ParseException {	//点餐boolean flag = true;while (flag) {int num = sc.nextInt();if (num != 0) {switch(num) {case(1):System.out.println("你点了" + num + "号餐品  ->  快乐儿童餐，如果继续点餐请输入序号，结束点餐请输0！");money = money + 9.9f;arr.add(num + "号餐品  -> 快乐儿童餐  价格：9.9RMB");break;case(2):System.out.println("你点了" + num + "号餐品  ->  吮指原味鸡，如果继续点餐请输入序号，结束点餐请输0！");money = money + 14.9f;arr.add(num + "号餐品  -> 吮指原味鸡  价格：14.9RMB");break;case(3):System.out.println("你点了" + num + "号餐品  ->  香辣炸鸡餐，如果继续点餐请输入序号，结束点餐请输0！");money = money + 19.9f;arr.add(num + "号餐品  -> 香辣炸鸡餐  价格：19.9RMB");break;case(4):System.out.println("你点了" + num + "号餐品  ->  可乐（大），如果继续点餐请输入序号，结束点餐请输0！");money = money + 4.9f;arr.add(num + "号餐品  -> 可乐（大）  价格：49.9RMB");break;case(5):System.out.println("你点了" + num + "号餐品  ->  超值双人餐，如果继续点餐请输入序号，结束点餐请输0！");money = money + 39.9f;arr.add(num + "号餐品  -> 超值双人餐  价格：39.9RMB");break;case(8):it(1);case(9):card.Menu();	//进入会员通道card.HaveSelect();break;default:System.out.println("没有这个餐品！请重新输入！结束点餐请输 0 或其他！");break;}}else {flag = false;}}money = Rounding(money);	//正常显示货币数System.out.println("你一共点了" + money + "RMB的餐品！");System.out.println("是否使用优惠券？（Y/N）");String ifUseOff = sc.next();if (ifUseOff.equals("Y") || ifUseOff.equals("y")) {Off();	//使用优惠券}else {System.out.println("不使用优惠券！");}System.out.println("请选择你的支付方式：n0.取消支付  1.现金支付  2.储值卡支付");boolean flag2 = true;while (flag2) {int selectPayWay = sc.nextInt();if (selectPayWay != 0 ) {switch(selectPayWay) {case(1):PayWithCash();	//现金支付flag2 = false;break;case(2):PayWithCard();	//储值卡支付flag2 = false;break;default:System.out.println("输入错误！请重新输入！");break;}}else {flag2 = false;}}}public void PayWithCard() throws IOException, InterruptedException, ParseException {paywithcard = true;SimpleDateFormat time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");	//输出日期float restMoney = card.PayLogin();	//储值卡登陆int index;	//用户在ArrayList中的index值将会传给它String str_restMoney;	//用户余额的string方式表达if (isWeekend(time.format(new Date()).toString()) == true) {	//如果是周末将享受8折优惠weekendOff = true;System.out.println("今天是周末！将享受八折折扣！");	//只有使用储值卡才会有周末优惠System.out.println("折前价为:" + money + "RMB");money *= 0.8;money = Rounding(money);System.out.println("折后价为:" + money + "RMB");}System.out.println("您当前的余额为：" + restMoney + "RMB");System.out.println("正在支付！请稍后！");Thread.sleep(2000);if (restMoney - money < 0) {	//如果余额不足将直接退出程序Thread.sleep(2000);System.out.println("对不起！您的余额不足！");it(1);}restMoney = restMoney - money;restMoney = Rounding(restMoney);Thread.sleep(2000);System.out.println("支付成功！");System.out.println("您现在的余额为：" + restMoney + "RMB");str_restMoney = String(restMoney);	//将余额转换成string型index = card.ReturnStaticIndex();	//index参数传递card.arr_money.set(index, str_restMoney);	//更新ArrayList指定的index的用户余额情况card.Rewrite();	//重写用户列表（card）}public void PayWithCash() {	//现金支付System.out.println("你选择使用现金支付！请输入你要付的钱数:");payMoney = sc.nextFloat();System.out.println("你支付了" + payMoney + "RMB，正在处理中请稍等！");if (payMoney >= money) {try {Thread.sleep(2000);backMoney = payMoney - money;DecimalFormat df = new DecimalFormat("0.0");	//对找零的数值进行合理化String_backMoney = df.format(backMoney);System.out.println("支付成功！找您" + String_backMoney + "RMB");//it(1);} catch (InterruptedException e) {e.printStackTrace();}}else {System.out.println("对不起！您支付的钱数不够！");it(1);}}public void Off() {	//优惠券函数boolean flag = true;System.out.println("使用优惠券！");System.out.println("您目前可用的优惠券有：");System.out.println("0.取消使用优惠券  1.满10减2  2.满20减5  3.满50减20  4.满100减50");System.out.println("你选择你要使用的优惠券：");money = Rounding(money);	//对money进行数值合理化while(flag) {Int()) {case(0):System.out.println("取消使用优惠券！");flag = false;break;case(1):if (money >= 10) {System.out.println("经系统检测，你可以使用该优惠券！");money -= 2;System.out.println("优惠已执行！目前合计：" + money + "RMB");OffNumber = 1;	//设置使用的优惠券编号用于小票输出}else {System.out.println("对不起！你的金额暂不支持使用该优惠券！");}flag = false;break;case(2):if (money >= 20) {System.out.println("经系统检测，你可以使用该优惠券！");money -= 5;System.out.println("优惠已执行！目前合计：" + money + "RMB");OffNumber = 2;}else {System.out.println("对不起！你的金额暂不支持使用该优惠券！");}flag = false;break;case(3):if (money >= 50) {System.out.println("经系统检测，你可以使用该优惠券！");money -= 20;System.out.println("优惠已执行！目前合计：" + money + "RMB");OffNumber = 3;}else {System.out.println("对不起！你的金额暂不支持使用该优惠券！");}flag = false;break;case(4):if (money >= 100) {System.out.println("经系统检测，你可以使用该优惠券！");money -= 50;System.out.println("优惠已执行！目前合计：" + money + "RMB");OffNumber = 4;}else {System.out.println("对不起！你的金额暂不支持使用该优惠券！");}flag = false;break;default:System.out.println("输入错误！取消使用优惠券请输入0！");break;}}}public void Print() throws IOException {float beforeOff;	//打折前的价格BufferedWriter write = new BufferedWriter((new FileWriter(new File("src/小票"))));SimpleDateFormat time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");	write.write(time.format(new Date()));		//输出时间戳wLine();wLine();for (int i = 0; i < arr.size(); i++) {write.(i));wLine();}	//输出商品列表wLine();if(weekendOff == true) {write.write("本次交易使用了周末优惠！");wLine();}if (paywithcard) {write.write("本次交易使用了储值卡支付！");wLine();}if (OffNumber != 0) {write.write("本次交易中使用了优惠券！");wLine();if (OffNumber == 1) {write.write("使用了 满10减2 优惠券！");wLine();beforeOff = money + 2;write.write("优惠前合计：" + beforeOff + "RMB");wLine();}else if (OffNumber == 2) {write.write("使用了 满20减5 优惠券！");wLine();beforeOff = money + 5;write.write("优惠前合计：" + beforeOff + "RMB");wLine();}else if (OffNumber == 3) {write.write("使用了 满50减20 优惠券！");wLine();beforeOff = money + 20;write.write("优惠前合计：" + beforeOff + "RMB");wLine();}else if (OffNumber == 4) {write.write("使用了 满100减50 优惠券！");wLine();beforeOff = money + 50;write.write("优惠前合计：" + beforeOff + "RMB");wLine();}}write.write("合计：" + money + "RMB");wLine();if (paywithcard == true) {write.write("支付：" + money + "RMB");	//如果使用储值卡支付，支付即为合计wLine();}else {write.write("支付：" + payMoney + "RMB");wLine();}if (paywithcard == true) {	//使用储值卡支付，不会出现找零}else {write.write("找零：" + String_backMoney + "RMB");wLine();}write.write("祝您用餐愉快！");write.flush();write.close();}public float Rounding(float money) {		//四舍五入BigDecimal b = new BigDecimal(money);return b.setScale(1, BigDecimal.ROUND_HALF_UP).floatValue();	}public boolean isWeekend(String date) throws ParseException {		//判断是否为周末DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");       Date bdate = format1.parse(date);Calendar cal = Instance();cal.setTime(bdate);(Calendar.DAY_OF_WEEK)==Calendar.SATURDAY||(Calendar.DAY_OF_WEEK)==Calendar.SUNDAY){return true;}else{return false;}}
}

Card.java

import java.io.*;
import java.util.ArrayList;
import java.util.Scanner;public class Card {ArrayList<String> arr_id = new ArrayList<String>();	//存放会员信息的三个ArrayListArrayList<String> arr_password = new ArrayList<String>();ArrayList<String> arr_money = new ArrayList<String>();static Scanner sc = new Scanner(System.in);public int static_index;public String id;public String password;public float restMoney;public void Menu() {System.out.println("********欢迎进入会员通道********");System.out.println("*************0.注册*************");System.out.println("*************1.登录*************");System.out.println("*************2.返回*************");}public void AfterLoginMenu() {System.out.println("********你已经成功登录!*********");System.out.println("*************1.充值*************");System.out.println("*************2.余额*************");System.out.println("*************3.退出*************");}public void HaveSelect() throws IOException, InterruptedException {System.out.println("请输入您的操作序号：");boolean flag = true;while(flag) {int num = sc.nextInt();if (num != 2) {switch(num) {case(0):CreatCard();break;case(1):Login();break;default:System.out.println("没有这个选项！请重新输入！");break;}}else {flag = false;Main.Menu();}}}public void AfterLoginSelect() throws InterruptedException, IOException {System.out.println("请输入您的操作序号：");boolean flag = true;while(flag) {int num = sc.nextInt();if (num != 3) {switch(num) {case(1):Charge();break;case(2):Show();break;default:System.out.println("没有这个选项！请重新输入！");break;}}else {flag = false;Menu();HaveSelect();}}}public void CreatCard() throws IOException, InterruptedException {boolean flag = true;String secondPassword;System.out.println("请输入你的卡号：");this.id = sc.next();System.out.println("请输入你的密码：");this.password = sc.next();System.out.println("请再次输入你的密码：");while(flag) {secondPassword = sc.next();if (secondPassword.equals(password)) {Thread.sleep(2000);System.out.println("账号创建成功！");flag = false;}else {System.out.println("输入错误！请重新输入！");}}Thread.sleep(2000);System.out.println("ID:" + this.id);System.out.println("PassWord:" + this.password);System.out.println("为了您的账户安全！请不要将你的密码告诉其他人！");BufferedWriter write = new BufferedWriter((new FileWriter(new File("src/Card"),true)));write.write("ID:" + this.id);	//输出信息到会员列表wLine();write.write("PassWord:" + this.password);wLine();write.write("Money:" + stMoney);wLine();System.out.println("储值卡创建完毕！");write.flush();write.close();}public void Login() throws IOException, InterruptedException {	//在会员通道中登录BufferedReader read = new BufferedReader((new FileReader(new File("src/Card"))));String str_id,str_password;String str = "";boolean F = true;int flag = 1;int index;while((str = adLine()) != null) {	//将会员的信息读入到ArrayList中if (flag % 3 == 1) {arr_id.add(str.substring(3));flag ++;}else if (flag % 3 == 2) {arr_password.add(str.substring(9));flag ++;}else{arr_money.add(str.substring(6));flag ++;}}read.close();while(F) {System.out.println("请输入你的卡号：");str_id = sc.next();if (ains(str_id)) {static_index = index = arr_id.indexOf(str_id);System.out.println("情输入你的密码：");str_password = sc.next();if ((index).equals(str_password)) {System.out.println("登录成功！");F = false;AfterLoginMenu();AfterLoginSelect();}else {System.out.println("密码错误！");}}else {System.out.println("未找到该用户！");}} }public float PayLogin() throws IOException, InterruptedException {	//用于支付时登录BufferedReader read = new BufferedReader((new FileReader(new File("src/Card"))));String str_id,str_password;String str = "";boolean F = true;int flag = 1;int index;while((str = adLine()) != null) {	//读取会员的信息if (flag % 3 == 1) {arr_id.add(str.substring(3));flag ++;}else if (flag % 3 == 2) {arr_password.add(str.substring(9));flag ++;}else{arr_money.add(str.substring(6));flag ++;}}read.close();while(F) {System.out.println("请输入你的卡号：");str_id = sc.next();if (ains(str_id)) {static_index = index = arr_id.indexOf(str_id);System.out.println("情输入你的密码：");str_password = sc.next();if ((index).equals(str_password)) {Thread.sleep(3000);System.out.println("登录成功！");F = false;}else {System.out.println("密码错误！");}}else {System.out.println("未找到该用户！");}}return restMoney = Float.parseFloat((static_index));}public int ReturnStaticIndex() {return static_index;}public void Charge() throws InterruptedException, IOException {	//充值String money;float chargeMoney;float restMoney;System.out.println("请输入充值的数目：");chargeMoney = sc.nextFloat();restMoney = Float.parseFloat((static_index));	//先读取用户的余额到内存中，并转换为floatrestMoney = restMoney + chargeMoney;Thread.sleep(2000);System.out.println("充值成功！");System.out.println("现在的余额为：" + restMoney);money = String(restMoney);	//充值完成后将float转换为stringarr_money.set(static_index, money);	//将转换好的string更新到ArrayList中Rewrite();}public void Rewrite() throws IOException {	//重写用户列表BufferedWriter write = new BufferedWriter((new FileWriter(new File("src/Card"))));for (int i = 0; i < arr_id.size(); i++) {write.write("ID:" + (i));wLine();write.write("PassWord:" + (i));wLine();write.write("Money:" + (i));wLine();}write.flush();write.close();}public void Show() throws InterruptedException {	//查询用户余额System.out.println("查询中！请稍后！");Thread.sleep(2000);System.out.println("Money:" + (static_index));}}