线程池中异常捕获

1、execute方法，子线程中有异常会抛出异常；

 public static void main(String[] args) {
     ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(2, 5, 1000, TimeUnit.SECONDS, new ArrayBlockingQueue(10));
for (int i=0;i<10;i++) {
    threadPoolExecutor.execute(()->doTask("execute"));
    
}

 threadPoolExecutor.shutdown();

 }
 private static void doTask(String string)throws RuntimeException {
     String str = "ThreadName:"+ Thread.currentThread().getName()+"执行方式:"+string;
     System.out.println(str);
     List list = null;
     System.out.println(list.size());      

 }

2、submit方法，子线程中有异常不会抛出，需要使用future.get()方法获取异常信息；

public class ThreadPools {
    public static void main(String[] args) {
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(2, 5, 1000, TimeUnit.SECONDS, new ArrayBlockingQueue(10));
   for (int i=0;i<10;i++) {
       Future future =  threadPoolExecutor.submit(()->doTask("submit"));
       try {
           future.get();
       } catch (InterruptedException e) {
           e.printStackTrace();
       } catch (ExecutionException e) {
           e.printStackTrace();
       }
   }

    threadPoolExecutor.shutdown();

    }
    private static void doTask(String string)throws RuntimeException {
        String str = "ThreadName:"+ Thread.currentThread().getName()+"执行方式:"+string;
        System.out.println(str);
        List list = null;
        System.out.println(list.size());
       /* try {
            System.out.println(list.size());
        }catch (Exception e) {
            System.out.println(e.getMessage());
        }
*/

    }
}

但是如果子线程中异常在子线程中被捕获到没有抛出，future.get()方法不会获取到异常信息；

public class ThreadPools {
    public static void main(String[] args) {
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(2, 5, 1000, TimeUnit.SECONDS, new ArrayBlockingQueue(10));
   for (int i=0;i<10;i++) {
       Future future =  threadPoolExecutor.submit(()->doTask("submit"));
       try {
           future.get();
       } catch (InterruptedException e) {
           e.printStackTrace();
       } catch (ExecutionException e) {
           e.printStackTrace();
       }
   }

    threadPoolExecutor.shutdown();

    }
    private static void doTask(String string)throws RuntimeException {
        String str = "ThreadName:"+ Thread.currentThread().getName()+"执行方式:"+string;
        System.out.println(str);
        List list = null;
        
        try {
            System.out.println(list.size());
        }catch (Exception e) {
            System.out.println(e.getMessage());
        }

    }