[Java] 练习题014: 输入某年某月某日，判断这一天是这一年的第几天？

import java.util.*;
public class Test014
{
public static void main(String[] args) throws Exception
{
int y,m,d;
int sum=0;
int feb=28;
Scanner in = new Scanner(System.in);
System.out.print("请输入年份:");
y = in.nextInt();
System.out.print("请输入月份:");
m = in.nextInt();
System.out.print("请输入几号:");
d = in.nextInt();

if((y%4==0 && y%100!=0) || y%400==0)
{
feb = 29;
}

switch(m)
{
case 1:
sum = d;
break;
case 2:
sum = 31 + d;
break;
case 3:
sum = 31+feb+d;
break;
case 4:
sum = 31+feb+31+d;
break;
case 5:
sum = 31+feb+31+30+d;
break;
case 6:
sum = 31+feb+31+30+31+d;
break;
case 7:
sum = 31+feb+31+30+31+30+d;
break;
case 8:
sum = 31+feb+31+30+31+30+31+d;
break;
case 9:
sum = 31+feb+31+30+31+30+31+31+d;
break;
case 10:
sum = 31+feb+31+30+31+30+31+31+30+d;
break;
case 11:
sum = 31+feb+31+30+31+30+31+31+30+31+d;
break;
case 12:
sum = 31+feb+31+30+31+30+31+31+30+31+30+d;
}
System.out.println(y+" 年 "+m+" 月 " + d + "号是今年的第"+sum+"天");
}
}