Method Detail

• addListener

  void addListener​(java.lang.Object listener)

  Add a listener to this container.

  Parameters:

  listener - the listener to add.

• removeListener

  boolean removeListener​(java.lang.Object listener)

  Remove a listener from this container.

  Parameters:

  listener - the listener to be removed.

  Returns:

  wether the listnener was found and removed or not.

• isEmpty

  boolean isEmpty()

  Get wether this container is empty or not.

  Returns:

  wether this container is empty or not.