java 日期计算

代码来自：    http://wenda.so.com/q/1364964025066182

import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date;  public class NDays {  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);   cal.add(Calendar.DATE, 100);   System.out.println((new SimpleDateFormat("yyyy-MM-dd")).format(cal.getTime())); } }