16.4.1. Event Sources and Listeners

Try these first

1. 1.

   What is an event source in GUI programming?

   Hint

   Think about what components trigger actions in your GUI.

2. 2.

   Describe the relationship between event sources and listeners.

   Hint

   Consider why the listener is necessary.

3. 3.

   What is the role of an event source?

   • Processes an event
   • Generates an event
   • Displays information

   Hint

   Think about what happens when you click a button.

4. 4.

   True or False: An ActionListener is a type of event source.

   • True
   • False

   Hint

   Remember the definitions of source and listener.

5. 5.

   Create a Java GUI application that has a button. When the button is clicked, it should change the text of a label to 'Button Pressed!'

   Hint

   Consider how the Button and JLabel interact through the ActionListener.

6. 6.

   Why is it important to properly manage event sources and listeners? Illustrate with an example.

   Hint

   Think about the consequences of a missing or incorrect listener.