学步园

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

public class HelloWorld {

public static void main(String[] args) {

//指定时间输出格式
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

Date dt = new Date();
System.out.println("当前时间：" + sdf.format(dt));

Calendar rightNow = Calendar.getInstance();
rightNow.setTime(dt);

rightNow.add(Calendar.YEAR,-1);//当时日期减1年
System.out.println("减1年：" + sdf.format(rightNow.getTime()));

rightNow.add(Calendar.MONTH,3);//(在刚才的结果上)再加3个月
System.out.println("再加3个月：" + sdf.format(rightNow.getTime()));

rightNow.add(Calendar.DAY_OF_YEAR,10);//(在刚才的结果上)再加10天
System.out.println("再加10天：" + sdf.format(rightNow.getTime()));

}
}