输入某年某月某日，判断这一天是这一年的第几天？。

还是比较简单的，只是润年的计算规则要搞清楚

private static int daysOfDate(int year,int month ,int day) {
   int[] monthDays = {31,28,31,30,31,30,31,31,30,31,30};
   if(month == 1){
       return day;
   }
   if(month == 2){
       return 31+day;
   }
   if((year % 4 == 0 && year % 100 != 0 ) || year % 400 == 0){
       monthDays[1] = 29;
   }
   int total = 0 ;
    for (int i = 0; i < month -1; i++) {
        total+= monthDays[i];
    }
    total+=day;
    return total;
}