isShutDown当调用shutdown()或shutdownNow()方法后返回为true。
isTerminated当调用shutdown()方法后，并且所有提交的任务完成后返回为true;
isTerminated当调用shutdownNow()方法后，成功停止后返回为true;
如果线程池任务正常完成，都为false
import java.util.concurrent.Callable;
public class ShortTask implements Callable {
@Override
public Object call() throws Exception {
System.out.println("短任务");
return null;
}
}
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
public class LongTask implements Callable {
@Override
public Object call() throws Exception {
System.out.println("长任务");
TimeUnit.SECONDS.sleep(5);
return null;
}
}
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class Main {
public static void main(String[] args) {
ScheduledExecutorService service = Executors.newScheduledThreadPool(4);
service.submit(new ShortTask());
service.submit(new ShortTask());
service.submit(new LongTask());
service.submit(new ShortTask());
System.out.println("isShutdown:" + service.isShutdown());
System.out.println("isTerminated:" + service.isTerminated());
service.shutdown();
// List<Runnable> list = service.shutdownNow();
// System.out.println(list.size());
System.out.println("isShutdown:" + service.isShutdown());
System.out.println("isTerminated:" + service.isTerminated());
try {
while (!service.awaitTermination(1, TimeUnit.SECONDS)) {
System.out.println("线程池没有关闭");
System.out.println("isTerminated:" + service.isTerminated());
}
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("线程池已经关闭");
System.out.println("isTerminated:" + service.isTerminated());
}
}
/* 执行service.shutdown(); 短任务 短任务 长任务 短任务 isShutdown:false isTerminated:false isShutdown:true isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池已经关闭 isTerminated:true*/ /* 执行List<Runnable> list = service.shutdownNow(); System.out.println(list.size()); 短任务 短任务 长任务 isShutdown:false isTerminated:false 1 isShutdown:true isTerminated:false 线程池已经关闭 isTerminated:true */ /* 如果不执行shutdown，也不执行shutdownNow： 短任务 短任务 长任务 短任务 isShutdown:false isTerminated:false isShutdown:false isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false 线程池没有关闭 isTerminated:false ......一直这样输出 */