java 3天之后的时间计算

java 3天之后的时间计算

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class testdate {

	public static  String  add3Day(Date date) throws ParseException{
		   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		   Calendar cal = Calendar.getInstance();
		   cal.setTime(date);//Date转换为Calendar
		   cal.add(Calendar.DATE, 3);//将日期往后推3天，减少3天则-3. 月增加则Calendar.MONTH
		   String after = sdf.format(cal.getTime());//Calendar转换为Date，再转换为String
		   return after;
		}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SimpleDateFormat sdf  = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Date td = null;
		try {
			td = sdf.parse("2016-11-04 11:41:00.332");
		} catch (ParseException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		try {
			System.out.println(add3Day(td));
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}