Calendar

package com.ls.java8.date;

import java.util.Calendar;

public class CalendarDemo1{

public static void main(String[] args) {    Calendar cal=Calendar.getInstance();//取得本类对象    StringBuffer buf=new StringBuffer();    buf.append(cal.get(Calendar.YEAR)).append("-");    buf.append(cal.get(Calendar.MONTH)+1).append("-");    buf.append(cal.get(Calendar.DAY_OF_MONTH)+3).append(" ");//如果加三天    buf.append(cal.get(Calendar.HOUR_OF_DAY)).append(":");    buf.append(cal.get(Calendar.MINUTE)).append(":");    buf.append(cal.get(Calendar.SECOND));    System.out.println(buf.toString());}

}