使用Calendar进行日期的计算

package ch;


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


public class DateAdd {
public static void main(String[] args) throws ParseException {
//...................
// now.get()方法能获取当前日期的年月日时分秒等信息
//...................
//1.实例化
Calendar now = Calendar.getInstance();  
//2.
String nowDate = now.get(Calendar.YEAR)+"-"+(now.get(Calendar.MONTH) + 1)+"-"+now.get(Calendar.DAY_OF_MONTH);
        System.out.println(nowDate);
        now.add(Calendar.DATE, 4);//计算加上四天以后的日期
        String lateDate = now.get(Calendar.YEAR)+"-"+(now.get(Calendar.MONTH) + 1)+"-"+now.get(Calendar.DAY_OF_MONTH);
        System.out.println(lateDate);//计算后的日期
        


          


}
}