求大神看这段代码怎么改 - 黑马程序员技术交流社区

/*
需求：输入一个时期，可以判断出是星期几
思想：设置一个初始日期，包括年，月，日，星期。如，2001-1-1 星期6
求出初始日期与当前日期的天数差值，然后再计算当前星期
*/
class Date
{
int year;
int month;
int day;
int week;
Date(int year,int month,int day)
{
this.year = year;
this.month = month;
this.day = day;
}
Date(int year,int month,int day,int week)
{
Date(year,month,day);
this.week = week;
}
void printDate()
{
System.out.print(this.year+"-"+this.month+"-"+this.day);
}
}
class LeapYear
{
//判断是否是闰年
public boolean isLeapYear(int year)
{
if(year%400==0 || year%100!=0 && year%4==0)
return true;
else
return false;
}
}
class HowManyDays
{
//2000年1月1日是周六
public final static Date startDate = new Date(2000,1,1,6);
int sumDays = 0;
//计算初始值与当前日期相差天数
public int getDays(Date endDate)
{
//计算相差整年的天数（即去年12月31日与2000.1.1之间共多少天）
for(int i=startDate.year;i<endDate.year;i++)
{
sumDays = sumDays+(new LeapYear().isLeapYear(i) ? 366 : 365);
}
//计算相差整月的天数
switch(endDate.month-1)
{
case 11: sumDays+=30;
case 10: sumDays+=31;
case 9 : sumDays+=30;
case 8 : sumDays+=31;
case 7 : sumDays+=31;
case 6 : sumDays+=30;
case 5 : sumDays+=31;
case 4 : sumDays+=30;
case 3 : sumDays = sumDays+(new LeapYear().isLeapYear(endDate.year) ? 29:28);
case 2 : sumDays+=30;
case 1 : sumDays+=31;
}
//计算相差的零散天数
sumDays+=endDate.day;
return sumDays;
}
}
class WhichWeek
{
public String getWeek(Date endDate)
{
int sumDays = new HowManyDays().getDays(endDate);
int path;//补丁
path = startDate.week-1;//path+sumDays，模7后余几就是星期几，余0就是星期日。
int wk = (path+sumDays)%7;//作为数组下标
//String[] week = new String[7];
//week[7] = {"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
String[] week = {"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
return week[wk];
}
}
class Excise314
{
public static void main(String[] args)
{
Date endDate = new Date(2000,1,1);
String week = new WhichWeek().getWeek(endDate);
endDate.printDate();
System.out.println(": "+week);
}
}

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path = HowManyDays.startDate.week - 1;// path+sumDays，模7后余几就是星期几，余0就是星期日。
int wk = (path + sumDays) % 7;// 作为数组下标

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this(year, month, day);
this.week = week;

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public static void main(String[] args) throws Exception {
String string = "2014.8.24";
Calendar calendar = Calendar.getInstance();
calendar.setTime(new SimpleDateFormat("yyyy.MM.dd").parse(string));
System.out.println(new DateFormatSymbols().getWeekdays()[calendar.get(Calendar.DAY_OF_WEEK)]);
}

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