最简单获取当前时间的方法：

方法一：

import java.util.Calendar;public class DateTime{ public static void main(String[] args){ Calendar c = Calendar.getInstance(); System.out.println("当前时间为:"); System.out.println(c.get(Calendar.YEAR)+"年"+(c.get(Calendar.MONTH)+1)+"月"+c.get(Calendar.DATE)+"日"); System.out.println(c.get(Calendar.HOUR)+"点"+c.get(Calendar.MINUTE)+"分"+c.get(Calendar.SECOND)+"秒"); System.out.println("今天是一年中的第：" + c.get(Calendar.DAY_OF_YEAR) + "天"); System.out.println("今天是一年中的第：" + c.get(Calendar.WEEK_OF_YEAR) + "个星期"); } }

方法二：

import java.util.Date;import java.text.SimpleDateFormat; public class NowString {public static void main(String[] args) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式System.out.println(df.format(new Date()));// new Date()为获取当前系统时间}}

方法三：

import java.util.Date; import java.util.Calendar; import java.text.SimpleDateFormat; public class TestDate{ public static void main(String[] args){ Date now = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");//可以方便地修改日期格式 String hehe = dateFormat.format( now ); System.out.println(hehe); Calendar c = Calendar.getInstance();//可以对每个时间域单独修改int year = c.get(Calendar.YEAR); int month = c.get(Calendar.MONTH); int date = c.get(Calendar.DATE); int hour = c.get(Calendar.HOUR_OF_DAY); int minute = c.get(Calendar.MINUTE); int second = c.get(Calendar.SECOND); System.out.println(year + "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second); } }