在不同线程中运行任务

Question

How can I run my task N-times in M-threads? For example, I have some task

public static Runnable createTask () {
   Runnable runnable = new Runnable() {
     @Override
     public void run() {               
        System.out.println("simple task");
     }
   };
return runnable;
}

I need to run this task N-times and divide the work into M-threads.

Answer 1

Here you go. If you want same task to run "N" time, then create "N" Callable instance of same task and add it in the Callable List which you will pass to invokeAll method.

      try {
        List<Callable<Object>> callableList = new ArrayList<Callable<Object>>();
        callableList.add(null); /*Add instance of Callable*/
        callableList.add(null); /*Add instance of Callable*/
        callableList.add(null); /*Add instance of Callable*/

        //Specify how many threads you want or need to operate. Read other methods of Executors which return different instances of ExecutorService
        final ExecutorService service = Executors.newFixedThreadPool(3);

        //This will invoke all your N tasks in specified M threads ...
        service.invokeAll(callableList);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }