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Questions and Answers
What is the primary purpose of a control that displays text?
What is the primary purpose of a control that displays text?
Label
What type of control appears as a rectangular region that can accept keyboard input?
What type of control appears as a rectangular region that can accept keyboard input?
TextField
What typically occurs when a user clicks a button?
What typically occurs when a user clicks a button?
An action takes place
In memory, how are the GUI objects in a scene organized?
In memory, how are the GUI objects in a scene organized?
What is the term for the parent of all other nodes in a scene?
What is the term for the parent of all other nodes in a scene?
What type of node can have other nodes as children?
What type of node can have other nodes as children?
What type of node cannot have other nodes as children?
What type of node cannot have other nodes as children?
All JavaFX applications must extend the __________ class.
All JavaFX applications must extend the __________ class.
What container arranges its contents in a single, vertical row?
What container arranges its contents in a single, vertical row?
What class is used to load an image file into memory?
What class is used to load an image file into memory?
What class is used to display an image?
What class is used to display an image?
What method does the EventHandler interface specify?
What method does the EventHandler interface specify?
The BorderPane layout container has five regions known as which of the following?
The BorderPane layout container has five regions known as which of the following?
What type of object does a layout container's getChildren() method return?
What type of object does a layout container's getChildren() method return?
The Stage class is in the JavaFX package.
The Stage class is in the JavaFX package.
The HBox container makes all of the nodes it contains the same height.
The HBox container makes all of the nodes it contains the same height.
You can nest a layout container inside of another layout container.
You can nest a layout container inside of another layout container.
Only one object at a time may be placed into a BorderPane region.
Only one object at a time may be placed into a BorderPane region.
What is an event-driven program?
What is an event-driven program?
What is the purpose of the Application class's launch method?
What is the purpose of the Application class's launch method?
What is the purpose of the Application class's abstract start method?
What is the purpose of the Application class's abstract start method?
What purpose do layout containers serve?
What purpose do layout containers serve?
What package are the Label, Button, and TextField classes in?
What package are the Label, Button, and TextField classes in?
What two classes do you use to display an image?
What two classes do you use to display an image?
What is an image's aspect ratio? How do you make sure it is preserved when you resize an image?
What is an image's aspect ratio? How do you make sure it is preserved when you resize an image?
Which layout container arranges controls in a horizontal row? Which layout container arranges controls in a vertical row? Which layout container arranges controls in rows and columns?
Which layout container arranges controls in a horizontal row? Which layout container arranges controls in a vertical row? Which layout container arranges controls in rows and columns?
How do you retrieve the text that the user has entered into a TextField control?
How do you retrieve the text that the user has entered into a TextField control?
Describe 3 different techniques for writing event handlers.
Describe 3 different techniques for writing event handlers.
Which layout container divides a container into regions known as top, bottom, left, center, and right?
Which layout container divides a container into regions known as top, bottom, left, center, and right?
When a selector name starts with a period in a JavaFX CSS style definition, it means the selector corresponds to what?
When a selector name starts with a period in a JavaFX CSS style definition, it means the selector corresponds to what?
Which of these is written in the correct syntax for a CSS style definition?
Which of these is written in the correct syntax for a CSS style definition?
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Study Notes
JavaFX Controls and Structures
- A Label is designed primarily for displaying text in JavaFX applications.
- TextField allows user keyboard input within a rectangular area.
- A Button triggers an action when clicked.
- JavaFX GUI objects are structured in memory as nodes within a Tree.
- Each scene can contain only one root node, which is the parent of all other nodes.
- Branch nodes can have child nodes, while leaf nodes cannot.
- Every JavaFX application must extend the Application class.
Layout Containers
- A VBox container organizes its contents in a vertical row.
- The Image class loads an image file, while ImageView displays the image.
- The EventHandler interface includes a method called handle for handling events.
- The BorderPane layout has five regions: Top, Bottom, Left, Right, and Center.
- The
getChildren()method of layout containers returns an ObservableList.
True or False Statements
- The statement about the Stage class being in the JavaFX package is False.
- False: The HBox container does not make all contained nodes the same height.
- True: Nested layout containers can exist within one another.
- True: Only one object can be placed into a BorderPane region at a time.
Event Handling and Application Lifecycle
- An event-driven program responds to user interactions, called EVENTS, with specific actions.
- The launch method of the Application class creates a Stage object, initializing the application window.
- The start method in the Application class serves as the application entry point.
Layout Containers and Their Purpose
- Layout containers are essential for organizing application parts into distinct areas.
- Classes like Label, Button, and TextField belong to the package javafx.scene.control.
- Image and ImageView are the two classes used to display images.
Image Handling
- The aspect ratio of an image refers to the ratio of its width to height, preserved by setting
setPreserveRatio(true)when resizing.
Various Layouts
- HBox arranges controls in a horizontal row.
- VBox arranges controls in a vertical row.
- GridPane organizes controls in both rows and columns.
User Interaction
- The getText() method retrieves user-entered text from a TextField control.
- Three techniques for writing event handlers include:
- Defining an inner class implementing EventHandler.
- Using an anonymous inner class for event handling.
- Employing a lambda expression for creating a lightweight event handler.
CSS in JavaFX
- The BorderPane divides its layout into top, bottom, left, center, and right regions.
- In JavaFX CSS, a selector starting with a period indicates it corresponds to specific types of nodes.
- A correct CSS style syntax example is:
.label {-fx-font-size: 20pt;}.
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