20 JavaFX Interview Questions and Answers

JavaFX is a software platform for creating and delivering desktop applications, as well as rich internet applications (RIAs) that can run across a wide variety of devices. As a result, JavaFX is a popular choice for developing interactive and engaging user interfaces. If you’re interviewing for a position that involves JavaFX development, you’ll want to be prepared to answer questions about your experience and skills. In this article, we discuss some common JavaFX interview questions and how you can answer them.

JavaFX Interview Questions and Answers

Here are 20 commonly asked JavaFX interview questions and answers to prepare you for your interview:

1. What is JavaFX?

JavaFX is a software platform for creating and delivering desktop applications, as well as rich internet applications (RIAs) that can run across a wide variety of devices.

2. Can you explain some of the main features of JavaFX?

Some of the main features of JavaFX include its support for graphics and media, its ability to create cross-platform applications, and its use of the Java language. JavaFX also has a number of built-in controls that can be used in applications, as well as support for CSS and HTML.

3. How does JavaFX differ from other GUI toolkits like Swing or SWT?

JavaFX is a newer toolkit that was designed to address some of the shortcomings of older toolkits like Swing and SWT. One of the main differences is that JavaFX uses a declarative syntax for specifying UI elements, which makes it easier to create complex UIs. Additionally, JavaFX provides built-in support for animation and multimedia, which can make applications more engaging and visually appealing.

4. What’s your understanding of the “JavaFX runtime”?

The JavaFX runtime is the software that runs your JavaFX applications. It includes the JavaFX SDK, which contains all the necessary tools and libraries to develop JavaFX applications, as well as the JavaFX Runtime, which is responsible for executing your JavaFX applications.

5. What IDE do you recommend for developing applications using JavaFX?

There are a few different IDE options available for developing JavaFX applications. Some popular choices include NetBeans, Eclipse, and IntelliJ IDEA.

6. Name some popular open source libraries that can be used with JavaFX to develop rich internet apps (RIAs)?

Some popular open source libraries that can be used with JavaFX to develop rich internet apps (RIAs) include the following:

– ControlsFX: A library of UI controls and other tools to enhance JavaFX applications
– Ensemble8: A sample application that demonstrates how to use JavaFX 8 features
– FX Experience Tools: A set of tools for creating and working with JavaFX applications
– Scene Builder: A tool for creating and editing JavaFX scenes

7. What is a Scene Graph in context with JavaFX?

A scene graph is a data structure that represents the hierarchy of objects in a scene, with the topmost object being the root node. In JavaFX, the scene graph is used to manage the graphical content of a scene. All nodes in the scene graph are represented by instances of the javafx.scene.Node class.

8. What are the different types of nodes supported by JavaFX?

The different types of nodes supported by JavaFX include: shapes, text, media, web, and 3D.

9. What are the various properties supported by Nodes?

The various properties supported by Nodes include:
-fill
-stroke
-strokeWidth
-effect
-opacity
-blendMode
-cache
-clip
-cursor
-disable
-disableVisualFocus
-focusTraversable
-id
-layoutX
-layoutY
-onContextMenuRequested
-onDragDetected
-onDragDone
-onDragDropped
-onDragEntered
-onDragExited
-onDragOver
-onInputMethodTextChanged
-onKeyPressed
-onKeyReleased
-onKeyTyped
-onMouseClicked
-onMouseDragEntered
-onMouseDragExited
-onMouseDragged
-onMouseDragOver
-onMouseDragReleased
-onMouseEntered
-onMouseExited
-onMouseMoved
-onMousePressed
-onMouseReleased
-onRotate
-onRotationFinished
-onRotationStarted
-onScroll
-onScrollFinished
-onScrollStarted
-onSwipeDown
-onSwipeLeft
-onSwipeRight
-onSwipeUp
-onTouchMoved
-onTouchPressed
-onTouchReleased
-onTouchStationary
-onZoom
-onZoomFinished
-onZoomStarted
-pickOnBounds
-rotate
-scaleX
-scaleY
-scaleZ
-snapToPixel
-style
-transform
-visible

10. What are the differences between Shape, Group, and Parent classes in JavaFX?

Shape is a class that is used to define geometric shapes. Group is a class that is used to group together multiple shapes. Parent is a class that is used to define the parent-child relationship between shapes.

11. What do you understand about the Model-View-Controller (MVC) architecture?

The Model-View-Controller (MVC) architecture is a common design pattern used in software development. It separates the application logic from the user interface, so that the two can be developed independently. The model represents the data and the business logic of the application, the view is the user interface, and the controller mediates between the two.

12. What is the difference between an FXML controller class and a regular Java controller class?

A regular Java controller class is a class that contains the logic for your JavaFX application. An FXML controller class is a class that is used to connect your FXML file to your Java code. The FXML controller class contains the logic for your application, but it is written in FXML instead of Java.

13. Are there any limitations on creating custom components in JavaFX? If yes, what are they?

There are some limitations on creating custom components in JavaFX. For example, you cannot create a custom component that extends javafx.scene.control.TextField. However, you can create a custom component that extends javafx.scene.control.Control and then add a TextField to it.

14. What are the default event handlers provided by JavaFX?

The default event handlers provided by JavaFX include handlers for key events, mouse events, and focus events.

15. What are the different ways available for creating animations in JavaFX?

There are four ways to create animations in JavaFX: key frames, timelines, transitions, and binding. Key frames are the simplest way to create an animation, and involve specifying the start and end states of the animation. Timelines are more complex, and allow you to specify multiple key frames and transitions between them. Transitions allow you to create animations that change smoothly over time, and binding allows you to bind the properties of two objects together so that they change in sync.

16. Where should you place external CSS files so that JavaFX loads them automatically?

You should place external CSS files in the same directory as your JavaFX application’s main class. JavaFX will automatically load any CSS files that are in this directory, and you can then reference them from your application’s code.

17. When should you use CSS stylesheets instead of inline styling?

In general, you should use CSS stylesheets for all of your styling needs in a JavaFX application. Inline styling should only be used in special cases where you need to override the stylesheet rules for a particular element.

18. What happens if you try to add a duplicate key to a HashMap?

If you try to add a duplicate key to a HashMap, the new key will overwrite the old one.

19. What is the purpose of a generic type?

A generic type is a type that is parameterized by one or more types. This allows you to create a type that is not specific to any one type, which can be useful when you want to write code that is reusable or when you want to write code that can work with multiple types.

20. What is the use case for anonymous inner classes?

Anonymous inner classes are often used in GUI programming to create event handlers. For example, if you have a button that you want to respond to a click, you would create an anonymous inner class that implements the EventHandler interface and override the handle() method. Then you would set the button’s onAction property to an instance of your anonymous inner class.