In the java.util.concurrent package, there are a bunch of interfaces dedicated to executing tasks. The simplest one is named Executor. This interface exposes a single method named execute​(Runnable command). Here is an example of executing a single task using this method:

public class SimpleExecutor implements Executor {

  @Override
  public void execute(Runnable r) {
    (new Thread(r)).start();
  }
}

SimpleExecutor se = new SimpleExecutor();

se.execute(() -> {
  System.out.println("Simple task executed via Executor interface");
});