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;
/**
* Title: ShortTask
* Description:
* @date 2018/1/28 17:32
*/
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;
/**
* Title: LongTask
* Description:
* @date 2018/1/28 17:33
*/
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
*/
英文好的可繼續參考源碼：
/**
* Returns {@code true} if this executor has been shut down.
*
* @return {@code true} if this executor has been shut down
*/
boolean isShutdown();
/**
* Returns {@code true} if all tasks have completed following shut down.
* Note that {@code isTerminated} is never {@code true} unless
* either {@code shutdown} or {@code shutdownNow} was called first.
*
* @return {@code true} if all tasks have completed following shut down
*/
boolean isTerminated();
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原文鏈接：https://blog.csdn.net/u010002184/article/details/79188403