17.4.3. Delegation Event Model (Used in Java)

Try these first

1. 1.

   What is an event source?

   Hint

   Think of components like buttons or text fields.

2. 2.

   Name a Java interface used to handle button clicks.

   Hint

   It starts with the letter 'A'.

3. 3.

   What separates event generation from event handling in Java?

   • Delegation Event Model
   • Polling Model
   • Callback Model

   Hint

   Think of the meaning of 'delegation'.

4. 4.

   True or False: ActionListener is used to handle keyboard events.

   • True
   • False

   Hint

   Consider what type of event each listener handles.

5. 5.

   Design a simple Java application using the Delegation Event Model that includes two buttons. One button changes the background color of a panel, and the other resets it.

   Hint

   Think about how you would capture button clicks and what methods you need to change the panel's properties.

6. 6.

   Explain how you would implement event handling for a text input field that should respond to user input and notify whenever a specific key is pressed.

   Hint

   Consider using methods like keyPressed and thinking about what specific key you want to check.