Timers, Transitions, Custom Components

What is a Timeline in JavaFX?

A Timeline in JavaFX is an animation class used to schedule actions over time. It manages a sequence of KeyFrame objects, controlling the overall timing of the animation, such as start, stop, repeat, and speed.

What is a KeyFrame in JavaFX?

A KeyFrame in JavaFX specifies an action to perform after a certain duration. It needs a Duration (how long after the start it should trigger) and an EventHandler (the action to perform).

What is the purpose of a Timer in JavaFX?

A Timer in JavaFX can be used to perform actions at regular intervals, such as counting down seconds. It can be bound to a UI element (e.g., a button) to reset or modify the timer.

What are Transitions in JavaFX?

Transitions in JavaFX are predefined animations that change properties of nodes (e.g., position, size, opacity) over time, eliminating the need to manually update properties frame by frame.

How do you build a JavaFX interface using an editor?

JavaFX interfaces can be built using SceneBuilder, a WYSIWYG editor that creates FXML files, which define the UI in XML format. FXML can also be written directly for interface creation.

What is FXML in JavaFX?

FXML is an XML-based markup language used to define the user interface in JavaFX applications. It is created by Oracle and used in conjunction with Java code to structure and control the UI.

How do you style JavaFX components using CSS?

JavaFX components can be styled using CSS, similar to web development. CSS files are created in the resources directory and linked to JavaFX components to define their appearance.

Why use CSS with JavaFX?

Using CSS with JavaFX allows for better reusability and consistency in styling, especially in larger programs. It helps separate the visual design from the application logic.

What are JavaFX Custom Components?

JavaFX Custom Components are user-defined components that extend the functionality of standard JavaFX components. They are useful when the existing JavaFX components do not meet the specific needs of the application.

How do you add images to a JavaFX application?

To add images in JavaFX, include the image files in the resources directory and load them using the appropriate JavaFX API. Exception handling should be implemented to manage file loading failures.

What is the JavaFX Canvas?

The JavaFX Canvas is a general-purpose drawing surface that allows you to directly draw shapes and other graphical elements. It is more flexible than creating objects within other components.

What is an ObservableList in JavaFX?

An ObservableList in JavaFX is a list that allows for automatic updates of UI components when its data changes. It is often used in UI elements like lists, tables, or trees.

What is Reflection in Java?

Reflection in Java allows a class or object to examine and modify its own structure, such as data fields, methods, and constructors, at runtime. It is available through the java.lang.reflect package.

What is the Class class in Java?

The Class class in Java is used for reflection, providing methods to examine the structure of classes, including fields, methods, and constructors. Each class has a singleton Class object associated with it.

What is the Field class in Java?

The Field class in Java provides information about the data fields of a class, allowing you to examine or modify them dynamically at runtime using reflection.

How do you use Field objects in Java?

Field objects are used to access or modify the data fields of a class at runtime. Through reflection, you can retrieve information about the field, including its type and value.

What is the Constructor class in Java?

The Constructor class in Java provides information about the constructors of a class. It allows you to dynamically examine or invoke constructors at runtime.

What is the Method class in Java?

The Method class in Java allows you to access and invoke methods of a class at runtime using reflection. You can retrieve information about the method, such as its parameters and return type.

How do you use Method objects in Java?

Method objects in Java are used to dynamically invoke methods at runtime. Through reflection, you can retrieve method information and execute it with specific argument