Java获取系统时间

1、毫秒显示

import java.util.Date;
 
long date = new Date().getTime();
System.out.println("从很早的时间到现在总的毫秒数："+ date +"毫秒");

 

 

 

2、时间格式显示

import java.util.Calendar;
 
public class SysDate {
 public static void main(String[] args) {
  Calendar c = Calendar.getInstance();
  System.out.println("年：" + c.get(Calendar.YEAR));
  System.out.println("月：" + (c.get(Calendar.MONTH) + 1));
  System.out.println("日：" + c.get(Calendar.DAY_OF_MONTH));
  System.out.println("24时制小时：" + c.get(Calendar.HOUR_OF_DAY));
  System.out.println("12时制：" + c.get(Calendar.HOUR));
  System.out.println("分：" + c.get(Calendar.MINUTE));
  System.out.println("秒：" + c.get(Calendar.SECOND));
  System.out.println("今天是一年中的第：" + c.get(Calendar.DAY_OF_YEAR) + "天");
 }
}