JAVA加减日期

package test;

 

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

 

public class T {

 

    public static void main(String[] args) {

        Date date = new Date();

        System.out.println((new SimpleDateFormat("yyyy-MM-dd")).format(date));

        Calendar cal = Calendar.getInstance();

        cal.setTime(date);

        //加天

        cal.add(Calendar.DATE, 100);

        System.out.println((new SimpleDateFormat("yyyy-MM-dd")).format(cal.getTime()));

        //减天

        cal.add(Calendar.DATE, -100);

        System.out.println((new SimpleDateFormat("yyyy-MM-dd")).format(cal.getTime()));

    }

 

}