源码是 ：
class DayShower {
public static void main (String [] arguments){
int yearIn = 2003;
int monthIn = 2;
if (arguments.length>0)
monthIn = Integer.parseInt(arguments[0]);
if (arguments.length>1)
yearIn = Integer.parseInt(arguments[1]);
System.out.println(yearIn + "年" +monthIn + "月有" + countDays(monthIn, yearIn) + "天");
static int countDays(int month,int year) {
int count = -1;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
count = 31;
break;
case 4:
case 6:
case 9:
case 11:
count = 30;
break;
case = 2:
if (year % 4 == 0)
count = 29 ;
else
count = 28;
if ((year % 100 == 0) & (year % 400 != 0))
count =28;
}
return count;
}
}

[QUOTE][/QUOTE]

我找到错误在那里了
System.out.println(yearIn + "年" +monthIn + "月有" + countDays(monthIn, yearIn) + "天");
}
case 2:
马虎了

呵呵 还是版主厉害啊