Question 31 :
What must a class do to implement an interface?
It must provide all of the methods in the interface and identify the interface in its implements clause.
Question 32 :
What method is invoked to cause an object to begin executing as a separate thread?
The start() method of the Thread class is invoked to cause an object to begin executing as a separate thread.
Question 33 :
Name two subclasses of the TextComponent class.
TextField and TextArea
Question 34 :
What is the advantage of the event-delegation model over the earlier event-inheritance model?
The event-delegation model has two advantages over the event-inheritance model. First, it enables event handling to be handled by objects other than the ones that generate the events (or their containers). This allows a clean separation between a component's design and its use. The other advantage of the event-delegation model is that it performs much better in applications where many events are generated. This performance improvement is due to the fact that the event-delegation model does not have to repeatedly process unhandled events, as is the case of the event-inheritance model.
Question 35 :
Which containers may have a MenuBar?