java 小白 奖客富翁系统

//非常简单的奖客富翁系统，仅供参考

package 练习;
import java.util.Scanner;
public class 练习012{
	public static void main(String[] args){
		int name =0;
		String mima="";
		Scanner input = new  Scanner(System.in);
		while (true){
			System.out.println("******欢迎进入奖客富翁系统******");
			System.out.println("1.注册");
			System.out.println("2.登录");
			System.out.println("3.抽奖");
			System.out.println("4.退出系统");
			System.out.println("******欢迎进入奖客富翁系统******");
			System.out.println("请选择您需要的服务：");
			int choose =input.nextInt();
			switch(choose){
			case 1:
				System.out.println("请设置用户名（五位数纯数字）：");
				name =input.nextInt();
				while (name>99999||name<10000){
					System.out.println("必须输入五位数纯数字，请重新输入：");
					name =input.nextInt();
				}
				System.out.println("请设置密码（任意符号、字母、数字组合）：");
				mima =input.next();
				System.out.println("您的用户名为："+name);
				System.out.println("您的密码为："+mima);
				System.out.println("请记住您的用户名和密码！");
				break;
			case 2:
				System.out.println("请输入用户名：");
				int namex =input.nextInt();
				while(name != namex){
					System.out.println("用户名不存在！请重新输入：");
					namex =input.nextInt();
				}			
				System.out.println("请输入密码：");
				String mimax =input.next();
				while (!mimax.equals(mima)){
					System.out.println("输入错误！请重新输入：");
					mimax =input.next();
				}
				break;
			case 3:
				int min =10000;
				int max =99999;
				int num1 = min-max;
				int num2 = min-max;
				int num3 = min-max;
				num1 = (int)(Math.random()*(min-max)) +max;
				num2 = (int)(Math.random()*(min-max)) +max;
				num3 = (int)(Math.random()*(min-max)) +max;
				System.out.println("今日幸运用户为：");
				System.out.println(num1+"\t"+num2+"\t"+num3);
				if (name != num1 && name != num2 && name != num3){
					System.out.println("很遗憾，您不是今日幸运用户！");
				}
				if (name == num1 || name == num2 || name == num3){
					System.out.println("恭喜！您被选中为今日的幸运用户！");
				}
				break;
			case 4:
				System.out.println("感谢使用本系统！");
				return;
			default:
				System.out.println(choose+"不是有效的选项，请重新输入：");
				break;
			}
		}
	}
}