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);
}
}