java中对Date类型的数据进行年月日的加减操作

packagecom;

importjava.text.SimpleDateFormat;
importjava.util.Calendar;
importjava.util.Date;

publicclassTest{
publicstaticvoidmain(String[]args)throwsException{

Datetoday=newDate();
CalendarresultDate=Calendar.getInstance();
resultDate.setTime(today);
resultDate.add(Calendar.YEAR,-1);
resultDate.add(Calendar.MONTH,3);
resultDate.add(Calendar.DAY_OF_YEAR,+10);
Datedt1=resultDate.getTime();
SimpleDateFormatformat=newSimpleDateFormat("yyyy-MM-dd");
Stringresult=format.format(dt1);
System.out.println("====="+result);
//日期相减得到之间相差的月数

//CalendarstartResultDate=Calendar.getInstance();
//CalendarendResultDate=Calendar.getInstance();
//startResultDate.setTime(startDate);
//endResultDate.setTime(endDate);
//得到开始时间到结束时间直接相差的月数
//intmonthCount=(endResultDate.get(1)-startResultDate.get(1))*12+(endResultDate.get(2)-startResultDate.get(2));

	}

}