题解 | #计算日期到天数转换#

import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner scanner=new Scanner(System.in);
while(scanner.hasNextLine()){
int sum=0;
String date=scanner.nextLine();
int indexday=date.lastIndexOf(" ");
int indexmonth=date.indexOf(" ");
//获取月
String strmonth=date.substring(indexmonth+1,indexday);
//获取日
String strday=date.substring(indexday+1);
int day=Integer.parseInt(strday);
//是否是闰年
String stryear=date.substring(0,indexmonth);
int year=Integer.parseInt(stryear);
if(year%4==0&&year%100!=0){
int[] num=new int[]{31,29,31,30,31,30,31,31,30,31,30,31};
//根据月份循环累加sum
int month=Integer.parseInt(strmonth);
for(int i=0;i<month-1;i++){
sum=sum+num[i];
}
System.out.println(sum+day);
}else{
int[] num=new int[]{31,28,31,30,31,30,31,31,30,31,30,31};
//根据月份循环累加sum
int month=Integer.parseInt(strmonth);
for(int i=0;i<month-1;i++){
sum=sum+num[i];
}
System.out.println(sum+day);
}

    }
}

}