TimeUnit 使用

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

	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

package com.app;

import java.util.concurrent.TimeUnit;

public class Test {

	public static void main(String[] args) {
		//1天有24个小时    1代表1天：将1天转化为小时
		System.out.println( TimeUnit.DAYS.toHours( 1 ) );
		
		//结果： 24
		

		//1小时有3600秒
		System.out.println( TimeUnit.HOURS.toSeconds( 1 ));
		
		//结果3600
		
		
		//把3天转化成小时
		System.out.println( TimeUnit.HOURS.convert( 3 , TimeUnit.DAYS ) );
		//结果是：72 

	}
}

package com.app;

public class Test2 {

	public static void main(String[] args) {

		new Thread( new Runnable() {

			@Override
			public void run() {
				try {
					Thread.sleep( 5 * 1000 );
					System.out.println( "延时完成了");
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}).start();  ;
	}
	
}

package com.app;

import java.util.concurrent.TimeUnit;

public class Test2 {

	public static void main(String[] args) {

		new Thread( new Runnable() {

			@Override
			public void run() {
				try {
					TimeUnit.SECONDS.sleep( 5 );
					System.out.println( "延时5秒，完成了");
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}).start();  ;
	}
	
}