幸运抽奖_学习笔记

import java.util.Scanner;

public class Synthetical {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		String userName = "admin";
		String password = "123456";
		String answer = "y";// 标识是否继续
		boolean isRegister = false;// 标识是否注册
		boolean isLogin = false;// 标识是否登录
		int max = 9999;
		int min = 1000;
		do {
			System.out.println("*****欢迎进入奖客富翁系统*****");
			System.out.println("\t1.注册");
			System.out.println("\t2.登录");
			System.out.println("\t3.抽奖");
			System.out.println("*************************");
			System.out.print("请选择菜单：");
			int choice = input.nextInt();
			switch (choice) {
			case 1:
				System.out.println("[奖客富翁系统>注册]");
				System.out.println("请填写个人注册信息：");
				System.out.print("用户名：");
				userName = input.next();
				System.out.print("密码：");
				password = input.next();
				// 获取4位随机数作为卡号
				int cardNumber = (int) (Math.random() * (max - min)) + min;
				System.out.println("\n注册成功，请记好您的会员卡号");
				System.out.println("用户名\t密码\t会员卡号");
				System.out.println(userName + "\t" + password + "\t"
						+ cardNumber + "\n");
				isRegister = true;// 注册成功，标识为true;
				break;
			case 2:
				if (isRegister) {// 判断是否注册
					// 3次输入机会
					for (int i = 0; i < 3; i++) {
						System.out.println("[奖客富翁系统>登录]");
						System.out.print("请输入用户名：");
						String inputName = input.next();
						System.out.print("请输入密码:");
						String inputPassword = input.next();
						if (inputName.equals(userName)
								&& (inputPassword.equals(password))) {

							System.out.println("\n欢迎您：" + userName);
							isLogin = true;// 登陆成功，标识为true;
							break;
						} else if (i < 3) {
							System.out
									.println("用户名或密码错误,还有" + (3 - i) + "次机会！");
						} else {
							System.out.println("您3次均输入错误！");
						}
					}
				} else {
					System.out.println("请先注册，再登录！");
				}
				break;
			case 3:
				System.out.println("[奖客富翁系统>抽奖]");
				if (!isLogin) {// 判断是否登录
					System.out.println("请先登录，再抽奖！");
				} else {
					// 生成5个4位随机数字，并保存在数组中
					int[] luckyNums = new int[5];
					for (int i = 0; i < luckyNums.length; i++) {
						luckyNums[i] = (int) (Math.random() * (max - min))
								+ min;
					}
					System.out.print("请输入您的卡号：");
					int yourcard = input.nextInt();
					System.out.print("本日的幸运数字为：");
					// 输出5个随机幸运数字
					int j;
					for (j = 0; j < luckyNums.length; j++) {
						System.out.print(luckyNums[j] + "   ");
					}
					// 依次取出每个数字，与输入的数字比较
					for (j = 0; j < luckyNums.length; j++) {
						if (luckyNums[j] == yourcard) {
							System.out.println("\n恭喜，您是本日的幸运会员！");
						}
					}
					if (luckyNums.length == j) {
						System.out.println("\n抱歉，您不是本日的幸运会员！");
					}
				}
				break;
			default:
				System.out.println("[您的输入有误,请正确输入（1~3）!]");
				break;
			}
			System.out.print("继续吗？(y/n):");
			answer = input.next();
		} while (answer.equals("y"));
		System.out.println("\n系统退出,谢谢使用！");
	}
}