时间类的常用方法

获取当前时间

示例

import java.text.SimpleDateFormat;
import java.util.Date;

public class CurrentTime {
    public static void main(String[] args) {
        Date date = new Date(System.currentTimeMillis());
        System.out.println(new SimpleDateFormat("HH:mm:ss").format(date));
    }
}

结果

11:18:30

System.currentTimeMillis() 获得系统当前毫秒数

示例

 @Test
    public void test3(){
        //获得系统的时间，单位为毫秒,转换为妙
        long totalMilliSeconds = System.currentTimeMillis();
        long totalSeconds = totalMilliSeconds / 1000;

        //求出现在的秒
        long currentSecond = totalSeconds % 60;

        //求出现在的分
        long totalMinutes = totalSeconds / 60;
        long currentMinute = totalMinutes % 60;

        //求出现在的小时
        long totalHour = totalMinutes / 60;
        long currentHour = totalHour % 24;

        //显示时间
        System.out.println("总毫秒为： " + totalMilliSeconds);
        System.out.println(currentHour + ":" + currentMinute + ":" + currentSecond + " GMT");
    }