Java获取当前时间方法总结

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); 
} 
}