JAVA简单的用户登录

package Experience;
import java.util.Scanner;
public class denglv {
    public static void main(String[] args) {
        String usn = "itest";
        String pwd = "it123";
        for (int i = 0; i < 3; i++) {
            Scanner a = new Scanner(System.in);
            Scanner b = new Scanner(System.in);
            String username = a.nextLine();
            String password = b.nextLine();
            if (username.equals(usn) && password.equals(pwd)) {
                System.out.println("登录成功");
                break;
            }else {
                if (i == 2) {
                    System.out.println("账户锁定,请三十分钟后再来");
                } else {
                    System.out.println("账号或密码错误,请重新输入");
                }
            }
        }
    }
}