如何在Java中以某个时间间隔一个一个地执行列表中的项目？

Question

I have a List of Items. I want to run some operation for each item in the list one by one. The operation might take 5 minutes to complete. The ask is that for a particular item in the list the operation should start and complete then only the operation should start for the next item and so on. The operation should execute for only the number of items in the list.

This list is being used by multiple threads.

I am thinking of using TimerTask for it or Schedular.

Can please help on this?

Answer 1

Ideally you should do it sequentially, since there is no benefit to using concurrency here.

However, if it needs to be multithreaded you can do something like ...

List<Runnable> tasks = new ArrayList<>();
tasks.add(new ThreadOne()); /* Pick better names for tasks */
tasks.add(new ThreadTwo());
...
ExecutorService worker = Executors.newSingleThreadExecutor();
worker.submit(() -> {
    while (!Thread.interrupted()) 
        tasks.forEach(Runnable::run);
});
worker.shutdown();