java语言的小程序......

求大神帮我写个小的程序，用户输入1到12到一个数字，然后显示出那个月的天数。

楼上这位哥们有点问题，和这个题目没关系啊，好久没写java了，我就说个思路，不写代码了

1）定义一个数组保存每个月的天数
2）根据输入的数字返回对应下标数组中的数字

3）如果考虑闰年，则需要计算一下输入年份是否是闰年，如果是只在2月的时候加一天，其他不变

package com.oracle.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oracle.domain.Book;
import com.oracle.domain.Category;
import com.oracle.service.BaseServlet;
import com.oracle.service.BookService;
import com.oracle.service.CategoryService;

public class BookServlet extends BaseServlet {
BookService bookService=new BookService();
public String findAll(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
List booklist = bookService.findAll();
request.setAttribute("booklist", booklist);
return "f:/jsps/book/list.jsp";
}
public String findByCid(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String cid = request.getParameter("cid");
List booklist = bookService.findByCid(cid);
request.setAttribute("booklist", booklist);
return "f:/jsps/book/list.jsp";
}

public String findByBid(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    String bid = request.getParameter("bid");
     Book book = bookService.findByBid(bid);
     System.out.println(book);
    request.setAttribute("book", book);
    return "f:/jsps/book/desc.jsp";
}

}

直接使用calendar类的getmonthofyear调用输出就可以，不会可以查api

import java.util.Scanner;

public class ShowDays {
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
System.out.println("请输入一个1~12的数字：");
int month=sc.nextInt();
int[] arr={31,28,31,30,31,30,31,31,30,31,30,31};
System.out.println(arr[month-1]);
}
}

public class TestMonth {

public static void main(String[] args) {
    Boolean flag=true;
    Scanner sc=new Scanner(System.in);
    while(flag){
    System.out.println("请输入一个1~12之间的一个月(ps：输入exit结束) ：");
    int month=sc.nextInt();
    if(month<1||month>12){
        System.out.println(month+"：输入不合法，请重新输入：");
    }else{
    int[] arr={31,28,31,30,31,30,31,31,30,31,30,31};
    System.out.println(arr[month-1]);
    }
    }
}

}