20 Javanotes 9.0, Quiz on Chapter 6

Quiz on Chapter 6

Question 1:

Programs written for a
graphical user interface have to deal with “events.” Explain what is meant by
the term event. Give at least two different examples of events, and
discuss how a program might respond to those events.

Question 2:

A central concept in JavaFX is the scene graph? What is a scene graph?

Question 3:

JavaFX has standard classes called Canvas
and GraphicsContext. Explain the purpose of
these classes.

Question 4:

Suppose that canvas is a variable of type Canvas.
Write a code segment that will draw a green square centered inside a red circle on the canvas, as illustrated.

Question 5:

Draw the picture that will
be produced by the following for loop, where
g is a variable of type GraphicsContext:

for (int i=10; i <= 210; i = i + 50) {
   for (int j = 10; j <= 210; j = j + 50) {
      g.strokeLine(i,10,j,60);
   }
}

Question 6:

JavaFX has a standard class
called MouseEvent. What is the purpose of this class? What does an
object of type MouseEvent do?

Question 7:

Explain the difference between a KeyPressed event
and a KeyTyped event.

Question 8:

Explain how AnimationTimers
are used to do animation.

Question 9:

What is a CheckBox and how is it used? How does
it differ from a RadioButton?

Question 10:

What is meant by layout of GUI components? Explain briefly how
layout is done in JavaFX.

Question 11:

How does a BorderPane arrange the components that it
contains?

Question 12:

How is the preferred size of a component set, and how is it used?

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