Code example for FutureTask

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    this.handler = handler;
    this.executor = executor;
  } 
 
  public FutureTask<Void> future() {
    future = new FutureTask<Void>(newTask());
    return future;
  } 
 
  public SafeAsyncTask<ResultT> executor(Executor executor) {
    this.executor = executor;
    return this;
  } 
 
  public Executor executor() {
    return executor;
  } 
 
  public SafeAsyncTask<ResultT> handler(Handler handler) {
    this.handler = handler;
    return this;
  } 
 
  public Handler handler() {
    return handler;
  } 
 
  public void execute() { 
    execute(Thread.currentThread().getStackTrace());
  } 
 
  protected void execute(StackTraceElement[] launchLocation) {
    this.launchLocation = launchLocation;
    executor.execute(future());
  } 
 
  public boolean cancel(boolean mayInterruptIfRunning) {
    if (future == null) {
      throw new UnsupportedOperationException(