JavaAPI：https://docs.oracle.com/javase/8/docs/api/index.html

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1 TimeUnit

api：https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html

TimeUnit是java.util.concurrent包下面的一個(gè)類；TimeUnit 是Java枚舉應(yīng)用場景中最好的例子之一，所有TimeUnit都是枚舉實(shí)例；

TimeUnit提供了更加優(yōu)雅的線程sleep寫法；TimeUnit還提供了各種時(shí)間單位轉(zhuǎn)換的方法；

NANOSECONDS //毫微秒 十億分之一秒【1微秒/1000】 MICROSECONDS //微秒 一百萬分之一秒【1毫秒/1000】 MILLISECONDS //毫秒 千分之一秒 SECONDS //秒 MINUTES //分鐘 HOURS //小時(shí) DAYS //天 //NANOSECONDS MICROSECONDS MILLISECONDS SECONDS MINUTES HOURS DAYS Arrays.stream(TimeUnit.values()).forEach((item -> System.out.print(item + " ")));

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2 線程睡眠

Modifier and TypeMethod and Description

static void	sleep(long millis)Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds, subject to the precision and accuracy of system timers and schedulers.
static void	sleep(long millis, int nanos)Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds plus the specified number of nanoseconds, subject to the precision and accuracy of system timers and schedulers.

TimeUnit提供了更加優(yōu)雅的線程睡眠寫法

//休眠40分種的三種寫法 // Thread.sleep(2400000); // Thread.sleep(40 * 60 * 1000); // 可讀性增強(qiáng)了 TimeUnit.MINUTES.sleep(40);

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3 時(shí)間單位轉(zhuǎn)換

//sleep 40分組 Thread.sleep(2400000);Thread.sleep(TimeUnit.MINUTES.toMillis(40)); Modifier and TypeMethod and Description

long	convert(long sourceDuration, TimeUnit sourceUnit)Converts the given time duration in the given unit to this unit.

//天轉(zhuǎn)化成小時(shí) TimeUnit.HOURS.convert(3, TimeUnit.DAYS); //72 //小時(shí)轉(zhuǎn)化為秒 TimeUnit.SECONDS.convert(1, TimeUnit.HOURS);//3600 Modifier and TypeMethod and Description

long	toDays(long duration)Equivalent to DAYS.convert(duration, this).

//天轉(zhuǎn)化為小時(shí) TimeUnit.DAYS.toHours(3); //72 //小時(shí)轉(zhuǎn)化為秒 TimeUnit.HOURS.toSeconds(1); //3600 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

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