问题

    有哪位朋友愿意帮助我看看这个错误。错在那里？？？

求救呀！

 

 

 

内容如下：

 

 

/*

 * To change this template, choose Tools | Templates

 * and open the template in the editor.

 */

 

package Tian;

import java.io.*;

 

/**

 *

 * @author ivan.luck2008

 */

import java.io.*;

 

class  daysInMonth

{

         static int year;

         static int month;

 

    //constructors

       public daysInMonth()

       {

     

         //System.out.println(month+" in "+year+" has "+days+"days");

 

 

       

    }

 

 

 

 

 

      

       //Test method

 

       public static int  accountDays(int year,int month)

    {

                            int flag;

 

                switch (month) {

                case 1:

                case 3:

                case 5:

                case 7:

                case 8:

                case 10:

                case 12:

                                          flag=31;

                         break;

                case 2:

                        if(isLeap(year))

                                                 flag=29;

 

                        else

                                             flag=28;

                                          break;

                default:

                        flag=31;

                        break;

                }

                            return flag;

        }

 

 

              //test Feb is isLeap or not

              public static boolean isLeap(int year)

        {

                if (year%4 == 0 && year%100 != 0)

                        return true;

                else if (year%100 == 0 && year%400 == 0)

                        return true;

                else

                        return false;

        }

 

 

              public static void main(String args[])

       {

                       String m,y;

        InputStreamReader in=new InputStreamReader(System.in);

        BufferedReader b=new BufferedReader(in);

        daysInMonth d=new daysInMonth();

        try

        {

            m=b.readLine();

            y=b.readLine();

 

            //transForm

            month=Integer.parseInt(m);

            year=Integer.parseInt(y);

            //class

          

 

        }catch(IOException e){

            System.out.println(e);

        }

                    

               int days=daysInMonth.accountDays(year, month);

            System.out.println(month+" in "+year+" has "+days+"days");

 

 

       }

}

程序运行结果如下， 本程序是想解决一个小小的黑盒测试，愿意是输入年份和月份。直接能够显示出结果格式是：

Eg ：

  Month 2 in 2000 has 29 days

有谁帮我看看错在那里！