目录

常用颗粒度

TimeUnit.DAYS          //天
TimeUnit.HOURS         //小时
TimeUnit.MINUTES       //分钟
TimeUnit.SECONDS       //秒
TimeUnit.MILLISECONDS  //毫秒

颗粒度转换

public long toMillis(long d)    //转化成毫秒
public long toSeconds(long d)  //转化成秒
public long toMinutes(long d)  //转化成分钟
public long toHours(long d)    //转化成小时
public long toDays(long d)     //转化天

import java.util.concurrent.TimeUnit;public class TimeUnitTest {public static void main(String[] args) {//convert 1 day to 24 hourSystem.out.println(TimeUnit.DAYS.toHours(1));//convert 1 hour to 60*60 second.System.out.println(TimeUnit.HOURS.toSeconds(1));//convert 3 days to 72 hours.System.out.println(TimeUnit.HOURS.convert(3, TimeUnit.DAYS));}}

可代替sleep

import java.util.concurrent.TimeUnit;public class ThreadSleep {public static void main(String[] args) {Thread t = new Thread(new Runnable() {private int count = 0;@Overridepublic void run() {for (int i = 0; i < 10; i++) {try {// Thread.sleep(500); //sleep 单位是毫秒TimeUnit.SECONDS.sleep(1); // 单位可以自定义,more convinent} catch (InterruptedException e) {e.printStackTrace();}count++;System.out.println(count);}}});t.start();}
}