java 多线程数量_java多线程之计算数量
packageThread.Abort;importjava.util.ArrayList;importjava.util.List;importjava.util.Random;importjava.util.concurrent.ExecutorService;importjava.util.concurrent.Executors;importjava.util.concurrent.TimeUnit;//計數類
class Count {//DATA
private int count = 0;private Random rand = new Random(47);// public synchronized intincrement() {int temp =count;if(rand.nextBoolean())
Thread.yield();return (count = ++temp);
}public synchronized intvalue() {returncount;
}
}//動作類
class Entrance implementsRunnable {private static Count count = newCount();private static List entrances = new ArrayList();private int number = 0;private final intid;private static volatile boolean canceled = false;public static voidcancel() {
canceled= true;
}public Entrance(intid) {this.id =id;
entrances.add(this);
}
@Overridepublic voidrun() {while (!canceled) {synchronized (this) {++number;
}
System.out.println(this + " Total:" + count.increment());//要顯示的數值都要通過同步方法讀取才準確
try{
TimeUnit.MICROSECONDS.sleep(100);
}catch(Exception e) {
System.out.println("sleep interrupted");
}
}
System.out.println("Stopping " + this);
}public synchronized intgetValue() {returnnumber;
}publicString toString() {return "Entrance " + id + ": " +getValue();
}public static intgetTotalCount() {returncount.value();
}public static intsumEntrances() {int sum = 0;for(Entrance entrance : entrances) {
sum+=entrance.getValue();
}returnsum;
}
}public classOrnamentalGarden {public static void main(String[] args) throwsInterruptedException {
ExecutorService exec=Executors.newCachedThreadPool();for (int i = 0; i < 5; i++) {
exec.execute(newEntrance(i));
}
TimeUnit.SECONDS.sleep(3);
Entrance.cancel();
exec.shutdown();if (!exec.awaitTermination(250, TimeUnit.MILLISECONDS))
System.out.println("Some tasks were not terminated!");
System.out.println("Total:" +Entrance.getTotalCount());
System.out.println("Sum of Entrances:" +Entrance.sumEntrances());
}
}
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