package tryo6;

import java.util.*;

class MyException extends Exception

{

    MyException()

    {

    }

}

class Pan

{

    double fen;

    void setGrade()

    {

        Scanner shu=new Scanner(System.in);

        try

        {

            try

            {

                fen=shu.nextDouble();

                if(fen<0||fen>100) throw new MyException();

            }

            catch(MyException e)//范围情况

            {

                System.out.println("超出范围，请重新输入：");

                setGrade();

            }

        }

        catch(Exception e)//其它情况

        {

            System.out.println("不能含有字符，请重新输入");

            setGrade();

        }

    }

    void showGrade()

    {

        if(fen>0&&fen<60) System.out.println("不及格");

        if(fen>60&&fen<=70) System.out.println("及格");

        if(fen>70&&fen<=80) System.out.println("中");

        if(fen>80&&fen<=90) System.out.println("良");

        if(fen>90&&fen<=100) System.out.println("优");

    }

}

public class grate {

    public static void main(String args[])

    {

        System.out.print("请输入0~100之间的分数：");

        Pan ru=new Pan();

        ru.setGrade();

        ru.showGrade();

    }

}