Java怎么实现简易购物系统

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用基本语句去实现一个购物系统

package cn.ybk; import java.util.Scanner; public class ShoppingSystem {     public static void main(String[] args) {        String choose3;        do {            Scanner input = new Scanner(System.in);            //1.主界面            System.out.println("======================");            System.out.println("========1.登录========");            System.out.println("========2.退出========");            System.out.println("======================");            System.out.println("请输入选项（1   or  2）");            int choose1 = input.nextInt();            if (choose1 == 1) {                //进入登录界面                System.out.println("======请登录======");                System.out.println("请输入用户名：");//输入用户名                String username = input.next();                System.out.println("请输入密码：");//输入密码                String passWord = input.next();                  //登录成功                if ("yangbenkun".equals(username) && "123456".equals(password)) {                    System.out.println("欢迎用户：" + username);                    System.out.println("->进入购物系统");                    //打印商品菜单                    System.out.println("商品编号\t商品名称\t\t\t商品单价");                    System.out.println("1\t\t\tJava基础语法\t\t35.4");                    System.out.println("2\t\t\tJava面向对象\t\t87");                    System.out.println("3\t\t\tJava实战项目\t\t76");                     double money1=0;//1的购物车单价                    double money2 = 0;//2的购物车单价                    double money3 =0;//3的购物车单价                    double money = 0;//总金额                      //do...while循环实现先多次购买                    String choose2;                    do {                        System.out.println("请输入你要购买的商品编号：");                        int no = input.nextInt();                        if(no == 1){                            System.out.println("请输入你要购买的数量：");                            int sum1 = input.nextInt();                            money1 = 35.4;                            money1 *= sum1;                            System.out.println("1的金额为："+money1);                         }else if(no == 2){                            System.out.println("请输入你要购买的数量：");                            int sum2 = input.nextInt();                            money2 = 87.0;                            money2 *= sum2;                            System.out.println("2的金额为："+money2);                         }else if(no == 3){                            System.out.println("请输入你要购买的数量：");                            int sum3 = input.nextInt();                            money3 = 76.0;                            money3 *= sum3;                            System.out.println("3的金额为："+money3);                        }else {                            System.out.println("选择有误请重新输入");                        }                        //计算总体金额                         money = money1 + money2 + money3;                        System.out.println("总金额为："+money);                        System.out.println("是否继续购买(n/y)");                         choose2 = input.next();                    }while("y".equals(choose2));                         if(money>=300){                        System.out.println("总金额已经满300打七五折");                        money*=0.75;                    }                    int i;//控制循环的循环变量的                    do {                        System.out.println("请输入你的余额");                        double usermoney = input.nextDouble();                        i = 1;                        if (usermoney<money){                            System.out.println("你的余额不足请");                            i--;                        }else{                            usermoney-=money;                            System.out.println("找零"+usermoney);                    }                    }while (i!=1);                    //z最后一项商城菜单                    System.out.println("========================");                    System.out.println("========谢谢惠顾========");                    System.out.println("======输入0退出系统=====");                    System.out.println("========================");                    int j = input.nextInt();                     if (j==0){                         break;                     }                  } else {//登录失败                    System.out.println("用户名或密码有误，已退出");                    return;                }            } else if (choose1 == 2) {             } else {                System.out.println("输入有误，程序自动退出");                break;            }            System.out.println("是否要退出系统：(n/y)");             choose3 = input.next();        }while("n".equals(choose3));        System.out.println("欢迎您下次光临");     }}

这里只列举了些许商品和一些其他的东西，可以继续改进完善把功能做的更加详细。

程序运行截图：

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