模拟用户登录案例-代码实现
import java.util.Scanner;
public class StringDemo2 {
public static void main(String[] args) {
String username = "admin";
String password = "admin";

    for (int x = 0; x < 3; x++) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入用户名:");
        String name = sc.next();
        System.out.println("请输入密码:");
        String pwd = sc.next();
        if (name.equals(username) && pwd.equals(password)) {
            System.out.println("登录成功");
            break;
        } else {
            if ((2 - x) == 0) {
                System.out.println("账号被冻结");
            } else {
                System.out.println("登录失败,你还有" + (2 - x) + "次机会");
            }
        }
    }
}

}