8.1、复习串讲
8.1.1、难点突破
8.1.2、知识梳理
8.2、综合练习
8.2.1、任务描述
8.2.2、上机练习
import java.util.Scanner;
public class LuckyNumber5 {/** * 幸运抽奖 */
public static void main(String[] args) {
String answer = "y"; // 标识是否继续
String userName = ""; // 用户名
String password = ""; // 密码
int cardNumber = 0; // 卡号
boolean isRegister = false; // 标识是否注册
boolean isLogin = false; // 标识是否登录
int max = 9999; int min = 1000;
Scanner input = new Scanner(System.in);
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
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);
isRegister = true; // 注册成功，标志位设置为true
break;
case 2:
System.out.println("[奖客富翁系统 > 登录]");
if (isRegister) { // 判断是否注册 // 3次输入机会
for (int i = 1; i <= 3; i++) {
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 (userName.equals(inputName) && password.equals(inputPassword)) {
System.out.println("\n欢迎您：" + userName);
isLogin = true; // 登录成功，标志位设置为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！");
System.out.println("继续吗？（y/n）");
answer = input.next();
} 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();
int i;
System.out.print("\n本日的幸运数字为：");
for (i = 0; i < luckynums.length; i++) {
System.out.print(luckynums[i] + " ");
}
for (i = 0; i < luckynums.length; i++) {
if (luckynums[i] == yourcard) {
System.out.println("\n恭喜！您是本日的幸运会员！");
break;
}
}
if (i == luckynums.length) {
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！]");
break;
}
System.out.print("继续吗？（y/n）:");
answer = input.next();
System.out.println("");
}
while ("y".equals(answer));
if ("n".equals(answer)) {
System.out.println("系统退出，谢谢使用！");
}
}
}