如何使ExecutorService創建執行完全相同任務的n個線程？

Question

我正在關注這個例子

在該示例中，可以創建一個線程池，該線程池將執行3個不同的任務。

但是，我只想創建一個由n個線程執行的任務。

int numberOfThreads = 2;
ExecutorService executorService = Executors.newFixedThreadPool(numberOfThreads);
Runnable task1 = () -> {
  System.out.println("Executing Task1 inside : " + 
  Thread.currentThread().getName());
  try {
    TimeUnit.SECONDS.sleep(2);
  } catch (InterruptedException ex) {
    throw new IllegalStateException(ex);
  }
};
executorService.submit(task1, numberOfThreads); // This is not like this obviously

我如何以適當的方式實現這一目標？

Answer 1

確實沒有魔術。 您要做的就是多次提交相同的任務，如下所示：

public static void main(String args[]) {
    int numberOfThreads = 2;
    ExecutorService executorService = Executors.newFixedThreadPool(numberOfThreads);
    Runnable task1 = () -> {
      System.out.println("Executing Task1 inside : " + 
      Thread.currentThread().getName());
      try {
        TimeUnit.SECONDS.sleep(2);
      } catch (InterruptedException ex) {
        throw new IllegalStateException(ex);
      }
    };
    executorService.submit(task1);
    executorService.submit(task1);
}