top.hmtools.prikey

Class SystemClock

java.lang.Object

top.hmtools.prikey.SystemClock

public class SystemClock
extends Object

高并发场景下System.currentTimeMillis()的性能问题的优化

System.currentTimeMillis()的调用比new一个普通对象要耗时的多（具体耗时高出多少我还没测试过，有人说是100倍左右）

System.currentTimeMillis()之所以慢是因为去跟系统打了一次交道

后台定时更新时钟，JVM退出时，线程自动回收

10亿：43410,206,210.72815533980582%

1亿：4699,29,162.0344827586207%

1000万：480,12,40.0%

100万：50,10,5.0%

Author:

lry

Method Summary

Modifier and Type	Method and Description
static long	now()
static String	nowDate()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

now

public static long now()

nowDate

public static String nowDate()