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                [TOC] # 簡介 TimeUnit是java.util.concurrent包下面的一個類,表示給定單元粒度的時間段 主要作用 * 時間顆粒度轉換 * 延時 # 常用的顆粒度 ~~~ TimeUnit.DAYS //天 TimeUnit.HOURS //小時 TimeUnit.MINUTES //分鐘 TimeUnit.SECONDS //秒 TimeUnit.MILLISECONDS //毫秒 ~~~ # 時間顆粒度轉換 ~~~ public long toMillis(long d) //轉化成毫秒 public long toSeconds(long d) //轉化成秒 public long toMinutes(long d) //轉化成分鐘 public long toHours(long d) //轉化成小時 public long toDays(long d) //轉化天 ~~~ 例子 ~~~ //1天有24個小時 1代表1天:將1天轉化為小時 System.out.println( TimeUnit.DAYS.toHours( 1 ) ); //結果: 24 //1小時有3600秒 System.out.println( TimeUnit.HOURS.toSeconds( 1 )); //結果3600 //把3天轉化成小時 System.out.println( TimeUnit.HOURS.convert( 3 , TimeUnit.DAYS ) ); //結果是:72 ~~~ # 延時 ~~~ TimeUnit.SECONDS.sleep( 5 ); ~~~ 內部也是Thread.sleep
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