java (给出年月日，计算该日是该年的第n天 )

package com.ywx.testdemo01;import java.util.Scanner;/**
* 题目：给出年月日，计算该日是该年的第n天
* @author yangwenxue
* date: 20150320
*/
class Order{
public static void orderDate(String date){
int dateSum=0;
int year=Integer.valueOf(date.substring(0, 4));
int month=Integer.valueOf(date.substring(5, 7));
int day=Integer.valueOf(date.substring(8, 10));
for(int i=1;i<month;i++){
switch(i){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
dateSum+=31;
break;
case 4:
case 6:
case 9:
case 11:
dateSum+=30;
break;
case 2:
if((year%4==0&&year%100!=0)||(year%400==0)){//判断是否是闰年
dateSum+=29;
}else{
dateSum+=28;
}
}
}
System.out.println("您输入的日期是该年的第："+(dateSum+day)+"天");
}
}
public class DateOfyear {
public static void main(String args[]){
while(true){
System.out.println("请输入年月日(格式2015-02-11)：");
Scanner sc=new Scanner(System.in);
String str=sc.nextLine();
if(str.equals("exit")){
System.out.println("系统退出!");
break;
}
Order.orderDate(str);
}
}
}