java初学者的第一个程序

来源：互联网发布：淘宝刷好评兼职要会费编辑：程序博客网时间：2024/06/05 14:51

/****/        public class Shopping {    public static void main(String [] args) {        System.out.println("\t\t欢迎使用我行我素管理系统1.0版");        System.out.println("* * * * * * * * * * * * * * * * * * * * * * * * * * * * *");        System.out.println("\t\t\t1.登录系统");System.out.println("\t\t\t2.更改管理员密码");System.out.println("\t\t\t3.退出");System.out.println("* * * * * * * * * * * * * * * * * * * * * * * * * * * * *");        System.out.print("请输入您的选择：");java.util.Scanner input = new java.util.Scanner(System.in);int choice1 = input.nextInt();       if(choice1 == 1){System.out.println("\t\t欢迎使用我行我素管理系统");System.out.println("* * * * * * * * * * * * * * * * * * * * * * * * * * * * *");System.out.println("\t\t\t1.客户信息管理");System.out.println("\t\t\t2.购物结算");System.out.println("\t\t\t3.真情回馈");System.out.println("\t\t\t4.返回上一级");System.out.println("* * * * * * * * * * * * * * * * * * * * * * * * * * * * *");System.out.print("请输入您的选择：");//java.util.Scanner input = new java.util.Scanner(System.in);int choice2 = input.nextInt();if(choice2 == 2){System.out.println("商城现有商品如下：");        System.out.println("商品编号\t\t商品名称\t\t商品价格");System.out.println("1\t\t\t云南白药\t\t￥18.00");System.out.println("2\t\t\t小米手机\t\t￥1,998.00");System.out.println("3\t\t\t小黑\t\t\t￥4,998.00");                                      System.out.println("4\t\t\t拖鞋\t\t\t￥25.80");System.out.println("5\t\t\t酱油\t\t\t￥5.60");System.out.println("6\t\t\t汽车模型\t\t￥350.00");System.out.println("7\t\t\t坦克模型\t\t￥400.00");System.out.println("8\t\t\t玩具枪\t\t￥99.80");System.out.print("请输入您要购买的产品编号：");//java.util.Scanner input = new java.util.Scanner(System.in);int choice3 = input.nextInt();System.out.print("请输入您要购买的产品数量：");//java.util.Scanner input = new java.util.Scanner(System.in);int choice4 = input.nextInt();double sum = 0;double a = 0;String str = "输入错误";switch (choice3) {    case 1:sum = choice4 * 18;a = 18;str = "云南白药";break;    case 2:sum = choice4 * 1998;a = 1998;str = "小米手机";break;    case 3:sum = choice4 * 4998;a = 4998;str = "小黑";break;    case 4:sum = choice4 * 25.8;a = 25.8;str = "拖鞋";break;    case 5:sum = choice4 * 5.6;a = 5.6;str = "酱油";break;    case 6:sum = choice4 * 350;a = 350;str = "汽车模型";break;    case 7:sum = choice4 * 400;a = 400;str = "坦克模型";break;    case 8:sum = choice4 * 99.8;a = 99.8;str = "玩具枪";break;       default:break;}System.out.println("尊敬的用户：小猫");System.out.println("产品名称\t\t产品单价\t\t购买数量");System.out.println(str + "\t\t" + a +"\t\t\t" + choice4);System.out.println("您购买的产品总价为：￥" + sum);System.out.println("按您当前的积分，您的折扣是：0.85");double b;b = 0.85 * sum;System.out.println("您的应付款为：￥" + (float)b);System.out.print("请付款：");//java.util.Scanner input = new java.util.Scanner(System.in);int num = input.nextInt();if(num < sum){    System.out.println("系统拒绝，请重新宠幸本系统！");} else {    System.out.println("付款成功！");    System.out.println("找零：￥" + (float)(num - b));    System.out.println("欢迎下次光临！");}} else {    System.out.println("功能正在升级中.........");}        } else {    System.out.println("功能正在升级中.........");        }    }}

程序运行结果如下：

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