# Package org.vertx.java.core

- Interface Summary
  Interface | Description
  --- | ---
  AsyncResultHandler<T> | Handler for `AsyncResult`
  Handler<E> | A generic event handler
  VertxFactory |

- Class Summary
  Class | Description
  --- | ---
  AsyncResult<T> | Represents a result that is returned asynchronously from an operation.
  SimpleHandler | This class can be used for simple handlers which don't receive any value.
  Vertx | The control centre of vert.x