Java怎样根据当前日期获得本月的所有日期

用Calendar类，具体参见其API

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class Test {

public static void main(String[] args) {

List list = getAllTheDateOftheMonth(new Date());

for(Date date: list){
System.out.println(date.toString());
}

}

private static List getAllTheDateOftheMonth(Date date) {
List list = new ArrayList();
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(Calendar.DATE, 1);

int month = cal.get(Calendar.MONTH);
while(cal.get(Calendar.MONTH) == month){
list.add(cal.getTime());
cal.add(Calendar.DATE, 1);
}
return list;
}

}

Calendar 可以使用这个日历实现