Javaのスレッドを逐次実行する

pulic class SampleCallable implements Callable<Void> {

  @Override
  public Void call() throws Exception {
    something();
    return null;
  }

}

List<Callable<Void>> callList = new ArrayList<Callable<Void>>();

SampleCallable call1 = new SampleCallable();
SampleCallable call2 = new SampleCallable();

callList.add(call1);
callList.add(call2)

ExecutorService executor = Executors.newSingleThreadExecutor();
executor.invokeAll(callList);
executor.shutdown();