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ÔÚÕâ¸ö·ÂÕæ³ÌÐòÖÐ,»¨Ô°Î¯Ô±»á¶¼Ï£ÍûÁ˽âÿÌìͨ¹ý´óÃŽøÈ빫԰µÄ×ÜÈËÊý.ÿ¸ö´óÃŶ¼ÓÐÒ»¸öÊ®×Ö
תÃÅ»òijÖÖÆäËûÐÎʽµÄ¼ÆÊýÆ÷,²¢ÇÒÈκÎÒ»¸öÊ®×ÖתÃŵļÆÊýÆ÷µÝÔöʱ,¾Í±íʾ¹«Ô°ÖеÄ×ÜÈËÊýµÄ¹²Ïí
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package OrnamentalGarden;
import java.util.Random;
/**
* ÕâÀïʹÓõ¥¸öµÄCount¶ÔÏóÀ´¸ú×Ù»¨Ô°µÄ²Î¹ÛÕߵļÆËãÖµ,²¢ÇÒ½«Æäµ±×öÊÇEntranceÀàÖеÄÒ»¸ö¾²Ì¬Óò½øÐзÃÎÊ
* @author Ȫ
*
*/
public class Count {
private int count = 0;
private Random rand = new Random(47);

public synchronized int increment() {
int temp = count;
if(rand.nextBoolean()) //ÕâÀïʹÓÃÁËRandomµÄ¶ÔÏó,Ä¿µÄÊǰѴÓcount¶ÁÈ¡µ½tempÖÐ,µ½µÝÔö,temp²¢°Ñ
Thread.yield(); //Æä´æ´¢»ØcountµÄÕâ¶Îʱ¼äÀï,ÓдóÔ¼Ò»°ëµÄʱ¼ä²úÉúÈò½.
return (count = ++ temp);
}

public synchronized int value() {
return count++;
}

}
----------------------------------------------------------
package OrnamentalGarden;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
public class Entrance implements Runnable {
private static Count count = new Count();
private static List<Entrance> entrances = new ArrayList<Entrance>();
private int number = 0;
private final int id;
private static volatile boolean canceled = false;

public Entrance(int id) {
this.id = id;
entrances.add(this);
}

public static void cancel() {
canceled = true;
}

public void run() {

while(!canceled) {
//ͬ²½¿ØÖÆ¿é
synchronized (this) {
++ number;
}
System.out.println(this + "Total: "+count.increment());
try {
TimeUnit.MICROSECONDS.sleep(100);
}catch(InterruptedException e) {
System.out.println("sleep interrupted !! ");
}
}
System.out.println("Stopping "+this);
}

public synchronized int getValue() {

return number;
}

public static int getTotalCount() {

return count.value();
}

public static int sumEntrances() {

int sum = 0;
for(En


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