即使在线程关闭之后,活动线程计数也不会减少
在下面的代码中,即使executor中的线程在5秒后终止,Thread.activeCount()也总是返回2。
public class MainLoop {
public static void main(String[] args) throws Exception {
ExecutorService executor = Executors.newFixedThreadPool(12);
executor.submit(new Callable<Void>() {
public Void call() throws Exception {
Thread.sleep(5000);
return null;
}
});
while (true) {
System.out.println(Thread.activeCount());
Thread.sleep(1000);
}
}
}
我期望Thread.activeCount()在5秒后返回1。为什么总是返回2?
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