java编写程序根据输入的年和月计算指定月的总天数,要代码

a)         要注意区分闰年的二月份和非闰年的二月份差别b)        对于输入字母，负数等非法输入不要求验证和处理

好了，你试一下
import java.util.*;
class Test
{
public static void main(String[] args)
{
try
{
Scanner in=new Scanner(System.in);
System.out.print("请输入年份：");
int year=in.nextInt();
System.out.print("请输入月份：");
int month=in.nextInt();
if(year<0 || month<0)
System.out.println("你输入的年份或月份为负，请输入正整数");
int day=28;
GregorianCalendar gc=new GregorianCalendar(year,month-1,day);
System.out.println(gc.get(Calendar.MONTH)+" "+gc.get(Calendar.DAY_OF_MONTH));

while((month-1)==gc.get(Calendar.MONTH))
{
gc.add(Calendar.DAY_OF_MONTH,1);
day++;
}

System.out.println("该月的总天数为："+(--day));
}
catch(Exception ex)
{
System.out.println("您输入了非法字符，程序退出，请输入正整数");
}
}
}

import java.util.Scanner; public class ChengXu14 { public static int method(int year,int mouth,int day){ int x; if(year%4==0){ x=29; }else{ x=28; } if(mouth==1){ return day; }else if(mouth==2){ return 31+method(year,mouth-1,day); }else if(mouth==3){ return x+method(year,mouth-1,day); }else if(mouth==4){ return 31+method(year,mouth-1,day); }else if(mouth==5){ return 30+method(year,mouth-1,day); }else if(mouth==6){ return 31+method(year,mouth-1,day); }else if(mouth==7){ return 30+method(year,mouth-1,day); }else if(mouth==8){ return 31+method(year,mouth-1,day); }else if(mouth==9){ return 31+method(year,mouth-1,day); }else if(mouth==10){ return 30+method(year,mouth-1,day); }else if(mouth==11){ return 31+method(year,mouth-1,day); }else{ return 30+method(year,mouth-1,day); } } public static void main(String[] args) { Scanner scanner=new Scanner(System.in); System.out.print("请输入年："); int x=scanner.nextInt(); System.out.print("请输入月："); int y=x=scanner.nextInt(); System.out.print("请输入日："); int z=scanner.nextInt(); int h=method(x,y,z); System.out.println(x+"年的第"+h+"天"); } }

这是我以前写滴一个计算从你出生到现在共活啦多少天滴程序，你可以参考一下！代码如下： import java.text.SimpleDateFormat; import java.util.Date; import java.util.Scanner; public class Test6 { public static void main(String[] args) { int year=0,month=0,day=0; int tianshu; Scanner scanner = new Scanner(System.in); System.out.print("请输入年"); year = scanner.nextInt(); System.out.print("请输入月"); month = scanner.nextInt(); System.out.print("请输入日"); day = scanner.nextInt(); tianshu=manyday(year , month , day ); System.out.println("您生活了："+tianshu+"天"); } private static int manyday(int year,int month,int day){ int shu = 0; int todayyear,todaymonth,todayday; String sNow = ""; int sheng=0; Date today = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); sNow = sdf.format(today); todayyear = Integer.parseInt(sNow.substring(0,4)); todaymonth = Integer.parseInt(sNow.substring(4,6)); todayday = Integer.parseInt(sNow.substring(6)); for(int i = year + 1;i < todayyear;i ++){ if (i % 4 == 0) { shu = shu + 366; } else { shu = shu + 365; } } sheng=howday(year, month, day); if(year % 4 == 0){ sheng = 366 - sheng ; }else { sheng = 365 - sheng; } shu = shu + sheng + howday(todayyear, todaymonth, todayday); return shu; } private static int howday(int year,int month,int day){ int da[] = {1,3,5,7,8,10,12}; int xiao[] = {4,6,9,11}; int tian = 0; if(month == 1){ tian = day; } else{ for(int i = 1;i < month;i++){ if(panduan(da, i)){ tian = tian + 31; } else if(panduan(xiao, i)){ tian = tian + 30; } else if ((i == 2)&&(year%4 == 0)) { tian = tian + 29; }else if ((i == 2)&&(year%4 != 0)) { tian = tian + 28; } } tian = tian + day; } return tian; } private static boolean panduan(int[] a,int bianliang){ boolean boo = false; for(int i = 0;i < a.length;i ++){ if(a[i] == bianliang){ boo = true; break; } } return boo; } }

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Test { public static void main(String[] args) { BufferedReader sc = new BufferedReader(new InputStreamReader(System.in)); int day = 0, month = 0, year = 0;// 天数 boolean bool = true;// 一开始设为输入真确 do { try { System.out.println("input year:"); year = Integer.parseInt(sc.readLine()); System.out.println("input month:"); month = Integer.parseInt(sc.readLine()); if( (month>12 || month<1) || year <= 0){ System.out.print("输入的年份或者月份有问题\n"); bool = false; } } catch (NumberFormatException e) { System.out.print("输入有误，你输入的是：" + e.getMessage().substring(e.getMessage().indexOf("\"")+1,e.getMessage().lastIndexOf("\"")) + "\n请重新输入"); bool = false; } catch (IOException e) { System.out.print("输入有误，你输入的是：" +e.getMessage().substring(e.getMessage().indexOf("\"")+1,e.getMessage().lastIndexOf("\"")) + "\n请重新输入"); bool = false; } } while (!bool); switch (month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: day = 31; break; case 2: if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) { // 2月只有29天 day = 29; } else { day = 28; } break; default: day = 30; } System.out.println(year + "-" + month + "有:" + day + "天"); } }

在java中，以下代码最简洁,使用switch 来判断

import java.util.scanner;

public class countday {

   public static void main(string[] args) {   // todo auto-generated method stub   scanner input = new scanner(system.in);   system.out.println("请输入年份");   int year = input.nextint();   system.out.println("请输入月份");   int month = input.nextint();   boolean bool ;   int num = 0;   if((year%4==0&&year%100!=0)||(year%400==0))   {    bool = true;   }   else   {    bool = false;   }   switch(month)   {   case 1:   case 3:   case 5:   case 7:   case 8:   case 10:   case 12:    num =31;    break;   case 4:   case 6:   case 9:   case 11:    num = 30;    break;   case 2:    if(bool==true)    {     num=29;    }    else if(bool = false)    {     num =28;    }    break;   }   system.out.println(year+"年"+month+"月有"+num+"天");  }

}

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