Java Chapter 14 Quiz and Flashcards on Color Objects

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Questions and Answers

Why is JavaFX preferred? (Select all that apply)

JavaFX has built-in 3D, animation support, video and audio playback, and runs as a standalone application or from a browser. (correct)

JavaFX is much simpler to learn and use for new Java programmers. (correct)

JavaFX incorporates modern GUI technologies to enable you to develop rich Internet applications. (correct)

JavaFX provides multi-touch support for touch-enabled devices such as tablets and smartphones. (correct)

Every JavaFX main class __________.

extends javafx.application.Application

Which of the following statements are true? (Select all that apply)

A scene is placed in the stage using the setScene method. (correct)

A scene is placed in the stage using the addScene method.

A primary stage is automatically created when a JavaFX main class is launched. (correct)

A stage is displayed by invoking the show() method on the stage. (correct)

You can have multiple stages displayed in a JavaFX program. (correct)

What is the output of the following JavaFX program? import javafx.application.Application; import javafx.stage.Stage; public class Test extends Application { public Test() { System.out.println("Test constructor is invoked."); } @Override public void start(Stage primaryStage) { System.out.println("start method is invoked."); } public static void main(String[] args) { System.out.println("launch application."); Application.launch(args); }}

launch application. Test constructor is invoked. start method is invoked. Signup and view all the answers

Which of the following statements are true? (Select all that apply)

A Shape is a Node. Signup and view all the answers

Which of the following statements are true?

A Node can be placed in a Pane. Signup and view all the answers

Which of the following statements are correct? (Select all that apply)

new Scene(new Pane()); Signup and view all the answers

To add a circle object into a pane, use _________.

pane.getChildren().add(circle); Signup and view all the answers

Which of the following statements are correct? (Select all that apply)

Circle is a subclass of Node. Signup and view all the answers

Which of the following are binding properties? (Select all that apply)

DoubleProperty Signup and view all the answers

Which of the following can be used as a source for binding properties? (Select all that apply)

DoubleProperty Signup and view all the answers

Suppose a JavaFX class has a binding property named weight of the type DoubleProperty. By convention, which of the following methods are defined in the class?

public DoubleProperty weightProperty() Signup and view all the answers

What is the output of the following code? import javafx.beans.property.IntegerProperty; import javafx.beans.property.SimpleIntegerProperty; public class Test { public static void main(String[] args) { IntegerProperty d1 = new SimpleIntegerProperty(1); IntegerProperty d2 = new SimpleIntegerProperty(2); d1.bind(d2); System.out.print("d1 is " + d1.getValue() + " and d2 is " + d2.getValue()); d2.setValue(3); System.out.println(", d1 is " + d1.getValue() + " and d2 is " + d2.getValue()); }}

d1 is 2 and d2 is 2, d1 is 3 and d2 is 3 Signup and view all the answers

What is the output of the following code? import javafx.beans.property.IntegerProperty; import javafx.beans.property.SimpleIntegerProperty; public class Test { public static void main(String[] args) { IntegerProperty d1 = new SimpleIntegerProperty(1); IntegerProperty d2 = new SimpleIntegerProperty(2); d1.bindBidirectional(d2); System.out.print("d1 is " + d1.getValue() + " and d2 is " + d2.getValue()); d1.setValue(3); System.out.println(", d1 is " + d1.getValue() + " and d2 is " + d2.getValue()); }}

d1 is 2 and d2 is 2, d1 is 3 and d2 is 3 Signup and view all the answers

Which of the following statements correctly sets the fill color of a circle to black? (Select all that apply)

circle.setStyle("-fx-fill: black"); Signup and view all the answers

Which of the following statements correctly rotates the button 45 degrees counterclockwise? (Select all that apply)

button.setRotate(360 - 45); Signup and view all the answers

Which of the following statements correctly creates a Color object? (Select all that apply)

Color.color(0.3, 0.5, 0.5); Signup and view all the answers

Which of the following statements correctly creates a Font object? (Select all that apply)

Font.font("Times", FontWeight.NORMAL, FontPosture.ITALIC, 34); Signup and view all the answers

Which of the following statements are correct? (Select all that apply)

You cannot change the contents in a Font object once it is created. Signup and view all the answers

Which of the following statements correctly creates an ImageView object? (Select all that apply)

new ImageView("http://www.cs.armstrong.edu/liang/image/us.gif"); Signup and view all the answers

Analyze the following code: import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.layout.HBox; import javafx.scene.layout.Pane; import javafx.geometry.Insets; import javafx.stage.Stage; import javafx.scene.image.Image; import javafx.scene.image.ImageView; public class Test extends Application { @Override public void start(Stage primaryStage) { Pane pane = new HBox(10); pane.setPadding(new Insets(5, 5, 5, 5)); Image image = new Image("www.cs.armstrong.edu/liang/image/us.gif"); pane.getChildren().addAll(new ImageView(image), new ImageView(image)); Scene scene = new Scene(pane); primaryStage.setTitle("ShowImage"); primaryStage.setScene(scene); primaryStage.show(); }}

new Image("www.cs.armstrong.edu/liang/image/us.gif") must be replaced by new Image("http://www.cs.armstrong.edu/liang/image/us.gif"). Signup and view all the answers

To add a node into a pane, use ______.

pane.getChildren().add(node); Signup and view all the answers

To add two nodes node1 and node2 into a pane, use ______.

pane.getChildren().addAll(node1, node2); Signup and view all the answers

To remove a node from the pane, use ______.

pane.getChildren().remove(node); Signup and view all the answers

To remove two nodes node1 and node2 from a pane, use ______.

pane.getChildren().removeAll(node1, node2); Signup and view all the answers

Which of the following statements are correct to create a FlowPane? (Select all that apply)

new FlowPane(4, 5, Orientation.VERTICAL); Signup and view all the answers

To add a node to the first row and second column in a GridPane pane, use ________.

pane.add(node, 1, 2); Signup and view all the answers

To add two nodes node1 and node2 to the first row in a GridPane pane, use ________.

pane.addRow(0, node1, node2); Signup and view all the answers

To place a node in the left of a BorderPane p, use ___________.

p.setLeft(node); Signup and view all the answers

To place two nodes node1 and node2 in a HBox p, use ___________.

p.getChildren().addAll(node1, node2); Signup and view all the answers

Analyze the following code: import javafx.application.Application; import javafx.scene.Scene; import javafx.stage.Stage; import javafx.scene.layout.HBox; import javafx.scene.shape.Circle; public class Test extends Application { @Override public void start(Stage primaryStage) { HBox pane = new HBox(5); Circle circle = new Circle(50, 200, 200); pane.getChildren().addAll(circle); circle.setCenterX(100); circle.setCenterY(100); circle.setRadius(50); pane.getChildren().addAll(circle); Scene scene = new Scene(pane); primaryStage.setTitle("Test"); primaryStage.setScene(scene); primaryStage.show(); }}

The program has a compile error since the circle is added to a pane twice. Signup and view all the answers

The _________ properties are defined in the javafx.scene.shape.Shape class. (Select all that apply)

fill Signup and view all the answers

The _________ properties are defined in the javafx.scene.text.Text class. (Select all that apply)

underline Signup and view all the answers

The _________ properties are defined in the javafx.scene.shape.Line class. (Select all that apply)

y1 Signup and view all the answers

The _________ properties are defined in the javafx.scene.shape.Rectangle class. (Select all that apply)

x Signup and view all the answers

The _________ properties are defined in the javafx.scene.shape.Ellipse class. (Select all that apply)

radiusX Signup and view all the answers

To construct a Polygon with three points x1, y1, x2, y2, x3, and y3, use _________. (Select all that apply)

Polygon polygon = new Polygon(); polygon.getPoints().addAll(x1, y1, x2, y2, x3, y3) Signup and view all the answers

To construct a Polyline with three points x1, y1, x2, y2, x3, and y3, use _________. (Select all that apply)

Polyline polyline = new Polygon(); polyline.getPoints().addAll(x1, y1, x2, y2, x3, y3) Signup and view all the answers

Assume p is a Polygon, to add a point (4, 5) into p, use _______. (Select all that apply)

p.getPoints().add(4.0); p.getPoints().add(5.0); Signup and view all the answers

Study Notes

JavaFX Overview

JavaFX offers a user-friendly experience for new Java programmers, making it easier to learn and use.
Provides native support for multi-touch on devices like tablets and smartphones.
Features built-in support for 3D graphics, animation, video, and audio playback; can be run standalone or through a browser.
Utilizes modern GUI technologies, facilitating the development of rich Internet applications.

JavaFX Main Class

Every JavaFX application's main class extends javafx.application.Application.
Must override the start(Stage s) method to define the entry point for the application.

Stages and Scenes

A primary stage is automatically created when launching a JavaFX application.
Multiple stages can be displayed simultaneously in a JavaFX program.
The show() method is used to display a stage.
To place a scene onto a stage, use the setScene() method.
A scene is typically composed of multiple nodes and is added directly to the stage.

Node and Pane Interactions

Shapes, controls, and panes are all considered nodes in JavaFX.
A node can be placed inside a Pane using getChildren().add(node).
To add multiple nodes, use getChildren().addAll(node1, node2).

Binding Properties

Binding properties such as IntegerProperty and DoubleProperty allow for dynamic changes in value.
Define getters, setters, and property methods for binding properties in custom classes.

Color and Font Objects

Color objects are immutable, with the ability to set fill colors using methods like setFill(Color.BLACK).
Font objects can be created with specified attributes such as font name, weight, and size.

ImageView Objects

Create ImageView objects using new ImageView(new Image("url")) syntax to display images.

Layout Containers

Common layout containers include FlowPane, GridPane, and BorderPane, each offering positioning and alignment of nodes.
GridPane uses a row and column system to place nodes, while BorderPane allows nodes to be positioned at the top, bottom, left, right, and center.

Shapes and Properties

Various shape classes (e.g., Circle, Rectangle, Line, Ellipse) come with specific properties defining their geometric characteristics.
Shapes can be manipulated with properties such as center coordinates, radius, width, height, and stroke color.

Polygon and Polyline Construction

Create Polygon and Polyline objects with specified points using constructors or methods to add points to their point lists.

Error Handling

Attempting to add a node to a pane multiple times can lead to compile or runtime errors.
Errors often arise from incorrectly configuring paths or parameters in code.

Summary of Code Outputs

Familiarize with the expected outputs from code snippets involving property bindings and image loading, as it illustrates dynamic behavior in JavaFX applications.

Practical Usage Tips

Always remove nodes using getChildren().remove(node) and add them using getChildren().add(node) to avoid duplication issues.
Ensure images have complete URLs for proper loading in ImageView.

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Test your knowledge on JavaFX and its features with these flashcards. This chapter emphasizes the advantages of using JavaFX for modern application development. Explore multi-touch support, built-in media capabilities, and its user-friendly nature.

Java Chapter 14 Flashcards

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Questions and Answers

Why is JavaFX preferred? (Select all that apply)

Every JavaFX main class __________.

Which of the following statements are true? (Select all that apply)

Which of the following statements are true? (Select all that apply)

Which of the following statements are true?

Which of the following statements are correct? (Select all that apply)

To add a circle object into a pane, use _________.

Which of the following statements are correct? (Select all that apply)

Which of the following are binding properties? (Select all that apply)

Which of the following can be used as a source for binding properties? (Select all that apply)

Suppose a JavaFX class has a binding property named weight of the type DoubleProperty. By convention, which of the following methods are defined in the class?

Which of the following statements correctly sets the fill color of a circle to black? (Select all that apply)

Which of the following statements correctly rotates the button 45 degrees counterclockwise? (Select all that apply)

Which of the following statements correctly creates a Color object? (Select all that apply)

Which of the following statements correctly creates a Font object? (Select all that apply)

Which of the following statements are correct? (Select all that apply)

Which of the following statements correctly creates an ImageView object? (Select all that apply)

To add a node into a pane, use ______.

To add two nodes node1 and node2 into a pane, use ______.

To remove a node from the pane, use ______.

To remove two nodes node1 and node2 from a pane, use ______.

Which of the following statements are correct to create a FlowPane? (Select all that apply)

To add a node to the first row and second column in a GridPane pane, use ________.

To add two nodes node1 and node2 to the first row in a GridPane pane, use ________.

To place a node in the left of a BorderPane p, use ___________.

To place two nodes node1 and node2 in a HBox p, use ___________.

The _________ properties are defined in the javafx.scene.shape.Shape class. (Select all that apply)

The _________ properties are defined in the javafx.scene.text.Text class. (Select all that apply)

The _________ properties are defined in the javafx.scene.shape.Line class. (Select all that apply)

The _________ properties are defined in the javafx.scene.shape.Rectangle class. (Select all that apply)

The _________ properties are defined in the javafx.scene.shape.Ellipse class. (Select all that apply)

To construct a Polygon with three points x1, y1, x2, y2, x3, and y3, use _________. (Select all that apply)

To construct a Polyline with three points x1, y1, x2, y2, x3, and y3, use _________. (Select all that apply)

Assume p is a Polygon, to add a point (4, 5) into p, use _______. (Select all that apply)

Study Notes

JavaFX Overview

JavaFX Main Class

Stages and Scenes

Node and Pane Interactions

Binding Properties

Color and Font Objects

ImageView Objects

Layout Containers

Shapes and Properties

Polygon and Polyline Construction

Error Handling

Summary of Code Outputs

Practical Usage Tips

Studying That Suits You

Description

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