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import java.io.IOException;
public class ResponseUI extends Thread{
private static volatile double d = 1;

public ResponseUI(){
super.setDaemon(true); //ÉèÖúǫ́ÔËÐÐ
start();
}

public void run(){
while(true){
d = d + (Math.E + Math.PI) / d;
}
}
/**
* @param args
* @throws InterruptedException
* @throws IOException
*/
public static void main(String[] args) throws InterruptedException, IOException {
// TODO Auto-generated method stub
new ResponseUI();
Thread.sleep(300);
System.in.read();
System.out.println(d);
}
}

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import java.util.concurrent.Semaphore;
/**
* ³éÏóÈÎÎñ£¬¾ßÌåµÄÖ´ÐÐÈÎÎñ£¬¹éʵÏÖÀฺÔð
*
* @author Administrator
*
*/
public abstract class Task {
public abstract void run();
private Semaphore s;
private boolean hasExisted = false;
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JAVA»ñµÃµ±Ç°Ê±¼ä

import java.util.Date;
import java.text.SimpleDateFormat; //ΪÁËÏÔʾʱ¼ä¶ø¼Ó
Date date = new Date(); //»ñµÃϵͳʱ¼ä.
String nowTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
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Effective Java ѧϰ±Ê¼Ç(4)

Õâ¸öÔ­ÔòºÜ¼òµ¥£¬¾ÍÊÇʹÓÃ˽Óй¹Ô캯Êý·ÀÖ¹À౻ʵÀý»¯¡£ ÓÐʱ£¬ÎÒÃÇ»áдһЩ¹¤¾ßÀ࣬Èçjava.lang.Math »òÊÇ java.util.Arrays, ÕâЩÀàÖж¼ÊǾ²Ì¬º¯Êý£¬ÔÚÉè¼ÆµÄʱºò£¬ÕâЩÀಢ²»ÊÇÓÃÀ´±»ÊµÀý»¯µÄ¡£Õâ¸öʱºò£¬¾ÍºÜÓбØÒª°Ñ¹¹Ô캯Êý˽Óл¯¡£ public class UtilityClass {

private UtilityClass() {
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