Programming Languages Chapter 14 Javafx Basics Section Javafx Swing And Awt Why Javafx Preferred Javafx

Chapter 14 JavaFX Basics

Section 14.2 JavaFX vs Swing and AWT

1. Why is JavaFX preferred?

a. JavaFX is much simpler to learn and use for new Java programmers.

b. JavaFX provides a multi–touch support for touch–enabled devices such as tablets and smart phones.

c. JavaFX has a built–in 3D, animation support, video and audio playback, and runs as a standalone application or

from a browser.

d. JavaFX incorporates modern GUI technologies to enable you to develop rich Internet applications.

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Section 14.3 The Basic Structure of a JavaFX Program

2. Every JavaFX main class .

a. implements javafx.application.Application

b. extends javafx.application.Application

c. overrides start(Stage s) method

d. overrides start() method

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3. Which of the following statements are true?

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

b. You can have multiple stages displayed in a JavaFX program.

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

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

e. A scene is placed in the stage using the setScene method

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4. 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 // Override the start method in the Application class

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);

}

a. launch application. start method is invoked.

b. start method is invoked. Test constructor is invoked.

c. Test constructor is invoked. start method is invoked.

d. launch application. start method is invoked. Test constructor is invoked.

e. launch application. Test constructor is invoked. start method is invoked.

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Section 14.4 Panes, UI Controls, and Shapes

5. Which of the following statements are true?

a. A Scene is a Node.

b. A Shape is a Node.

c. A Stage is a Node.

d. A Control is a Node.

e. A Pane is a Node.

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6. Which of the following statements are true?

a. A Node can be placed in a Pane.

b. A Node can be placed in a Scene.

c. A Pane can be placed in a Control.

d. A Shape can be placed in a Control.

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7. Which of the following statements are correct?

a. new Scene(new Button(“OK”));

b. new Scene(new Circle());

c. new Scene(new ImageView());

d. new Scene(new Pane());

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

a. pane.add(circle);

b. pane.addAll(circle);

c. pane.getChildren().add(circle);

d. pane.getChildren().addAll(circle);

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9. Which of the following statements are correct?

a. Every subclass of Node has a no-arg constructor.

b. Circle is a subclass of Node.

c. Button is a subclass of Node.

d. Pane is a subclass of Node.

e. Scene is a subclass on Node.

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Section 14.5 Binding Properties

10. Which of the following are binding properties?

a. Integer

b. Double

c. IntegerProperty

d. DoubleProperty

e. String

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11. Which of the following can be used as a source for binding properties?

a. Integer

b. Double

c. IntegerProperty

d. DoubleProperty

e. String

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12. 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?

a. public double getWeight()

b. public void setWeight(double v)

c. public DoubleProperty weightProperty()

d. public double weightProperty()

e. public DoubleProperty WeightProperty()

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13. 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());

}

a. d1 is 2 and d2 is 2, d1 is 3 and d2 is 3

b. d1 is 2 and d2 is 2, d1 is 2 and d2 is 3

c. d1 is 1 and d2 is 2, d1 is 1 and d2 is 3

d. d1 is 1 and d2 is 2, d1 is 3 and d2 is 3

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14. 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());

}

a. d1 is 2 and d2 is 2, d1 is 3 and d2 is 3

b. d1 is 2 and d2 is 2, d1 is 2 and d2 is 3

c. d1 is 1 and d2 is 2, d1 is 1 and d2 is 3

d. d1 is 1 and d2 is 2, d1 is 3 and d2 is 3

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Section 14.6 Common Properties and Methods for Nodes

15. Which of the following statements correctly sets the fill color of circle to black?

a. circle.setFill(Color.BLACK);

b. circle.setFill(Color.black);

c. circle.setStyle(“–fx–fill: black”);

d. circle.setStyle(“fill: black”);

e. circle.setStyle(“–fx–fill–color: black”);

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16. Which of the following statements correctly rotates the button 45 degrees counterclockwise?

a. button.setRotate(45);

b. button.setRotate(Math.toRadians(45));

c. button.setRotate(360 – 45);

d. button.setRotate(-45);

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Section 14.7 The Color Class

17. Which of the following statements correctly creates a Color object?

a. new Color(3, 5, 5, 1);

b. new Color(0.3, 0.5, 0.5, 0.1);

c. new Color(0.3, 0.5, 0.5);

d. Color.color(0.3, 0.5, 0.5);

e. Color.color(0.3, 0.5, 0.5, 0.1);

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Section 14.8 The Font Class

18. Which of the following statements correctly creates a Font object?

a. new Font(34);

b. new Font(“Times”, 34);

c. Font.font(“Times”, 34);

d. Font.font(“Times”, FontWeight.NORMAL, 34);

e. Font.font(“Times”, FontWeight.NORMAL, FontPosture.ITALIC, 34);

Key:abcde See Figure 14.10.

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19. Which of the following statements are correct?

a. A Color object is immutable.

b. A Font object is immutable.

c. You cannot change the contents in a Color object once it is created.

d. You cannot change the contents in a Font object once it is created.

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Section 14.9 The Image and ImageView Classes

20. Which of the following statements correctly creates an ImageView object?

a. new ImageView(“http://www.cs.armstrong.edu/liang/image/us.gif”);

b. new ImageView(new Image(“http://www.cs.armstrong.edu/liang/image/us.gif”));

c. new ImageView(“image/us.gif”);

d. new ImageView(new Image(“image/us.gif”));

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21. 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 // Override the start method in the Application class

public void start(Stage primaryStage) {

// Create a pane to hold the image views

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));

// Create a scene and place it in the stage

Scene scene = new Scene(pane);

primaryStage.setTitle(“ShowImage”); // Set the stage title

primaryStage.setScene(scene); // Place the scene in the stage

primaryStage.show(); // Display the stage

}

/**

* The main method is only needed for the IDE with limited

* JavaFX support. Not needed for running from the command line.

*/

public static void main(String[] args) {

launch(args);

}

a. The program runs fine and displays two images.

b. 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”).

c. The image object cannot be shared by two ImageViews.

d. The addAll method needs to be replaced by the add method.

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Section 14.10 Layout Panes

Section 14.10.1 FlowPane

22. To add a node into a pane, use .

a. pane.add(node);

b. pane.addAll(node);

c. pane.getChildren().add(node);

d. pane.getChildren().addAll(node);

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

a. pane.add(node1, node2);

b. pane.addAll(node1, node2);

c. pane.getChildren().add(node1, node2);

d. pane.getChildren().addAll(node1, node2);

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24. To remove a node from the pane, use .

a. pane.remove(node);

b. pane.removeAll(node);

c. pane.getChildren().remove(node);

d. pane.getChildren().removeAll(node);

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

a. pane.remove(node1, node2);

b. pane.removeAll(node1, node2);

c. pane.getChildren().remove(node1, node2);

d. pane.getChildren().removeAll(node1, node2);

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26. Which of the following statements are correct to create a FlowPane?

a. new FlowPane()

b. new FlowPane(4, 5)

c. new FlowPane(Orientation.VERTICAL);

d. new FlowPane(4, 5, Orientation.VERTICAL);

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Section 14.10.2 GridPane

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

a. pane.getChildren().add(node, 1, 2);

b. pane.add(node, 1, 2);

c. pane.getChildren().add(node, 0, 1);

d. pane.add(node, 0, 1);

e. pane.add(node, 1, 0);

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

a. pane.add(node1, 0, 0); pane.add(node2, 1, 0);

b. pane.add(node1, node2, 0);

c. pane.addRow(0, node1, node2);

d. pane.addRow(1, node1, node2);

e. pane.add(node1, 0, 1); pane.add(node2, 1, 1);

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Section 14.10.3 BorderPane

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

a. p.setEast(node);

b. p.placeLeft(node);

c. p.setLeft(node);

d. p.left(node);

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Section 14.10.4 HBox and VBox

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

a. p.add(node1, node2);

b. p.addAll(node1, node2);

c. p.getChildren().add(node1, node2);

d. p.getChildren().addAll(node1, node2);

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31. 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 // Override the start method in the Application class

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);

// Create a scene and place it in the stage

Scene scene = new Scene(pane);

primaryStage.setTitle(“Test”); // Set the stage title

primaryStage.setScene(scene); // Place the scene in the stage

primaryStage.show(); // Display the stage

}

/**

* The main method is only needed for the IDE with limited

* JavaFX support. Not needed for running from the command line.

*/

public static void main(String[] args) {

launch(args);

}

a. The program has a compile error since the circle is added to a pane twice.

b. The program has a runtime error since the circle is added to a pane twice.

c. The program runs fine and displays one circle.

d. The program runs fine and displays two circles.

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Section 14.11 Shapes

32. The properties are defined in the javafx.scene.shape.Shape class.

a. stroke

b. strokeWidth

c. fill

d. centerX

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Section 14.11.1 Text

33. The properties are defined in the javafx.scene.text.Text class.

a. text

b. x

c. y

d. underline

e. strikethrough

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Section 14.11.2 Line

34. The properties are defined in the javafx.scene.shape.Line class.

a. x1

b. x2

c. y1

d. y2

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Section 14.11.3 Rectangle

35. The properties are defined in the javafx.scene.shape.Rectangle class.

a. width

b. x

c. y

d. height

e. arcWidth

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Section 14.11.4 Circle and Ellipse

36. The properties are defined in the javafx.scene.shape.Ellipse class.

a. centerX

b. centerY

c. radiusX

d. radiusY

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Section 14.11.5 Arc

36. The properties are defined in the javafx.scene.shape.Ellipse class.

a. centerX

b. centerY

c. radiusX

d. radiusY

e. startAngle

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Section 14.11.6 Polygon and Polyline

37. To construct a Polygon with three points x1, y1, x2, y2, x3, and y3, use .

a. new Polygon(x1, y1, x2, y2, x3, y3)

b. new Polygon(x1, y2, x3, y1, y2, y3)

c. Polygon polygon = new Polygon(); polygon.getPoints().addAll(x1, y1, x2, y2, x3, y3)

d. Polygon polygon = new Polygon(); polygon.getPoints().addAll(x1, y2, x3, y1, y2, y3)

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38. To construct a Polyline with three points x1, y1, x2, y2, x3, and y3, use .

a. new Polyline(x1, y1, x2, y2, x3, y3)

b. new Polyline(x1, y2, x3, y1, y2, y3)

c. Polyline polyline = new Polygon(); polyline.getPoints().addAll(x1, y1, x2, y2, x3, y3)

d. Polyline polyline = new Polygon(); polyline.getPoints().addAll(x1, y2, x3, y1, y2, y3)

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39. Assume p is a Polygon, to add a point (4, 5) into p, use .

a. p.getPoints().add(4); p.getPoints().add(5);

b. p.getPoints().add(4.0); p.getPoints().add(5.0);

c. p.getPoints().addAll(4, 5);

d. p.getPoints().addAll(4.0, 5.0);