Scanner录入出现错误

信息类：

public class UserInf {
    final private String userName = new String("JiHe");
    final private String passWord = new String("JiHe123");

    public UserInf() {
        super();
        // TODO Auto-generated constructor stub
        check();
    }

    public void check() {
        System.out.println("Please input userName:");
        Scanner sc = new Scanner(System.in);
        if (this.userName.equals(sc.nextLine())) {
            if (this.passWord.equals(sc.nextLine())) {
                System.out.println("Please input passWord:");
                System.out.println("Check Pass !");
            }
        }
    }
}

测试类：

 public class TestUser {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        UserInf user = new UserInf();
    }

}

问题：console只输出一句，无法输出第二句：
` Please input userName:
JiHe`