Executor interface in java.util.concurrent package lets you submit Runnable tasks. Executor then handles the execution of the task. This interface provides a way of decoupling task submission from the mechanics of how each task will be run, including details of thread use, scheduling, etc.

Contract of Executor interface has a single method: execute(Runnable command)

The following executor is a basic implementation. It runs the task on the main thread without creating a new thread.

public class DirectExecutor implements Executor {

    public static void main(String[] args) {
        Executor executor = new DirectExecutor();
        executor.execute(new Runnable() {
            public void run() {
                System.out.println("Simple task completed!");

    public void execute(Runnable command) {


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