Question

lort answers, 2 points each in no more than one sentence per question Ta. How does a JavaFX GridPane differ from a BorderPane? b. A JavaFX application must contain a class that extends 1o. What is the fle name extension for a tle that contains this kind of code? fx-font-color: #FF0000,\ code in Java. The other way involes designing the cun i GUI 1d. One way t using to use JavaFX is to write all the te. In order to implement the Event-Handler interface Java FX event handler a method called Question 2, 15 points Write a well-structured paragraph that answers this question: Suppose a programmer with no object-oriented programming classes have that name. How would you reply? asperience ashed you

Answer 1

1a. How does a JavaFX GridPane differs from a BorderPane?

Answer: In a GridPane, elements are added in row-column fashion, just like a tabular form, whereas in BorderPane, elements are added in CENTER,TOP, BOTTOM, LEFT or RIGHT of the window.

1b. A JavaFX application must contain a class that extends Application class

1c. What is the file extension for a file that contains this kind of code.

.grid{

                -fx-font-color:#FF000;

}

Answer: css (cascading style sheet, just like in HTML)

1d. One way to use JavaFX is to write all code in Java. The other way involves designing the GUI using FXML (which is an XML based markup language used to design the JavaFX GUI)

1e.In order to implement the EventHandler interface, a JavaFX event handler must have a method called handle(T event) (where T is the type of Event (ex: MouseEvent))

2. Why abstract classes have that name?

Answer:

The word abstract means an existing thought or an idea that does not have a physical or concrete existence. An abstract system is the one that cannot exist themselves, but live through other systems that use this idea. Consider the term – shape. A shape is a geometric figure such as a square, circle or triangle, which provides an outline for the existence of such things. When we think of a square, or a triangle, or a circle, all of these things have something in common – a particular height and width (or even thickness if the object is 3 dimensional), a color, a coordinate where these figures exist, an area or perimeter which is occupied by these figures, etc. All of these common features are used to create an abstract system called Shape. So that it can be generalized under one category. In terms of programming, an abstract class act as an existing set of common variables and methods, which cannot be used to create objects (i.e can’t be instantiated), but can be used to create child classes that inherit the properties of the parent class. Considering the above example, Shape can be an abstract class with properties – a coordinate where the shape exist, a height value, a width value, total area occupied by the shape, total perimeter occupied by the shape, color of the shape, and so on. Child classes can be Square, that has equal width and height, a Rectangle that has different width and heights, a Circle that has a radius, which is the half of the width or height of that shape, a Pentagon that has 5 sides and an angle between each sides etc.

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