java.util.concurrent.TimeUnit
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java.util.concurrent.TimeUnit
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JavaAPI:https://docs.oracle.com/javase/8/docs/api/index.html
1 TimeUnit
api:https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html
TimeUnit是java.util.concurrent包下面的一個類;TimeUnit 是Java枚舉應用場景中最好的例子之一,所有TimeUnit都是枚舉實例;
TimeUnit提供了更加優雅的線程sleep寫法;TimeUnit還提供了各種時間單位轉換的方法;
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 DAYS //天 //NANOSECONDS MICROSECONDS MILLISECONDS SECONDS MINUTES HOURS DAYS Arrays.stream(TimeUnit.values()).forEach((item -> System.out.print(item + " ")));2 線程睡眠
| 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); // 可讀性增強了 TimeUnit.MINUTES.sleep(40);3 時間單位轉換
//sleep 40分組 Thread.sleep(2400000);Thread.sleep(TimeUnit.MINUTES.toMillis(40));| long | convert(long sourceDuration, TimeUnit sourceUnit)Converts the given time duration in the given unit to this unit. |
| long | toDays(long duration)Equivalent to DAYS.convert(duration, this). |
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