ResultWaiter, is there any in java standard API

Question

I need a class like the following for "synchronizing" asynchronus results.
public class ResultWaiter {
   private Object lock;
   private Exception ex;
   private Object result;
   public ResultWaiter() {
      lock = new Object();
      result= null;
      ex = null;
   public Object getResult() throws Exception {
      if (result == null) {
         synchronized (lock) {
            try {
               lock.wait(5000);
            } catch (InterruptedException ex) {}
      if (result== null && ex == null) {
         throw new Exception("A timeout occured ");
      if (result != null) {
         return result;
      throw ex;
   public void handleResult(Object result) {
      synchronized (lock) {
         this.result= result;
         lock.notifyAll();
   public void handleError(Exception ex) {
      synchronized (lock) {
         this.ex = ex;
         lock.notifyAll();
}Is there a class which provides this behaviour in the Java APIs or do I need to write it myself?

Answer 1

java.util.concurrent.Future
java.util.concurrent.FutureTask?