isShutDown當調用shutdown()或shutdownNow()方法后返回為true。
isTerminated當調用shutdown()方法后，並且所有提交的任務完成后返回為true;
isTerminated當調用shutdownNow()方法后，成功停止后返回為true;
如果線程池任務正常完成，都為false
import java.util.concurrent.Callable;
public class ShortTask implements Callable {
@Override
public Object call() throws Exception {
System.out.println("短任務");
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("長任務");
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("線程池沒有關閉");
System.out.println("isTerminated:" + service.isTerminated());
}
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("線程池已經關閉");
System.out.println("isTerminated:" + service.isTerminated());
}
}
/* 執行service.shutdown(); 短任務 短任務 長任務 短任務 isShutdown:false isTerminated:false isShutdown:true isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池已經關閉 isTerminated:true*/ /* 執行List<Runnable> list = service.shutdownNow(); System.out.println(list.size()); 短任務 短任務 長任務 isShutdown:false isTerminated:false 1 isShutdown:true isTerminated:false 線程池已經關閉 isTerminated:true */ /* 如果不執行shutdown，也不執行shutdownNow： 短任務 短任務 長任務 短任務 isShutdown:false isTerminated:false isShutdown:false isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false 線程池沒有關閉 isTerminated:false ......一直這樣輸出 */