编写程序提示用户输入日期，输出这天为星期几。

package judgeWeekday;

import java.util.Scanner;

public class JudgeWeekday {

//参考点选择2014年1月1日星期三具有一定的特殊性；代码也与之有关。
public static final int YEAR0 = 2014;
//public static final int MONTH0 = 1;
//public static final int DAY0 = 1;
public static final int WEEKDAY0 = 3;
public static final String week[]={"天","一","二","三","四","五","六"};
public static final int leapmonthday[]={31,29,31,30,31,30,31,31,30,31,30,31};
public static final int noleapmonthday[]={31,28,31,30,31,30,31,31,30,31,30,31};

public static void main(String[] args) {

Scanner console = new Scanner(System.in);
System.out.print("input the date like 1983 3 29: ");
int year = console.nextInt();
int month = console.nextInt();
int day = console.nextInt();
boolean ynleap = judgeleap(year);

int weekday = judgeWeekday (year,month,day,ynleap);

System.out.println( year + "年" + month + "月" + day +"日是星期" + week[weekday]);
}

public static int judgeWeekday (int year,int month,int day,boolean ynleap)
{
int sum = computeDaysDistance(year,month,day,ynleap);
int weekday = getWeekday(sum,year);
return weekday;
}

//计算输入输入日期与参考日期相隔的天数。
public static int computeDaysDistance(int year,int month,int day,boolean ynleap)
{
int sum = 0,sum1 = 0,sum2 = 0;
if(year <  YEAR0)
{
//计算sum1
for(int i = year + 1;i <  YEAR0;i++)
{
if(judgeleap(i))
sum1 += 366;
else
sum1 += 365;
}
//计算sum2
if(ynleap)
{
sum2 = leapmonthday[month - 1]- day +1;
for(int j = month + 1;j <=12;j++)
sum2 += leapmonthday[j - 1];
}
else
{
sum2 = noleapmonthday[month -1]- day +1;
for(int j = month + 1;j <=12;j++)
sum2 += noleapmonthday[j - 1];
}
}
else
{
//计算sum1
for(int i = YEAR0;i < year;i++)
{
if(judgeleap(i))
sum1 += 366;
else
sum1 += 365;
}
//计算sum2
sum2 = day -1;
for(int j = 1;j <= month -1;j++)
{
if(ynleap)
sum2 += leapmonthday[j - 1];
else
sum2 += noleapmonthday[j -1];
}

}
//计算sum
sum =sum1 + sum2;
return sum;
}
//给与参考日期相隔的天数得到输入日期是星期几。
public static int getWeekday(int sum,int year)
{
int weekday = 0;
if(year <  YEAR0)
weekday = (WEEKDAY0 + 7 - (sum %7))%7;
else
weekday = (WEEKDAY0 + (sum % 7))%7;
return weekday;
}
//判断给定的year是否闰年。
public static boolean judgeleap(int year)
{
boolean ynleap;
if(((year % 4 ==0)&&(year % 100!= 0))||(year % 400 == 0))
ynleap = true;
else
ynleap = false;
return ynleap;
}

}//class