GUIs

Question 1

What is an event driven language?

Answer 1

• Action/Interactions like button clicks or mouse presses will trigger an event
• Events are preprogramed blocks of code that will run when certain actions are performed

Question 2

What is the purpose of a layout manager?

Answer 2

Determines the locations of buttons and objects in the GUI

Question 3

How do you add layers of abstraction to a GUI?

Answer 3

Nesting layout managers in one another

Question 4

What is the purpose of the following listeners?
1. MouseListener
2. MouseMotionListener
3. ChangeListener
4. ActionListener

Answer 4

1. MouseListener: Responds to mouse clicks
2. MouseMotionListener: Responds to mouse movements
3. ChangeListener: Responds to GUI check boxes
4. ActionListener: Responds to GUI buttons and menu items

Question 5

Where can Inner classes be defined?

Answer 5

• Inside the scope of a class, but outside any methods
• Inside the scope of a class and inside of a method

Question 6

Which object is used to draw components on screen?

Answer 6

The “Graphics” object, often declared as “g”