Programming Languages Chapter 14 Homework You can add a stage into another stage

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Name:_______________________

(150 minutes)

CSCI 1302 OO Programming

Armstrong Atlantic State University

Instructor: Dr. Y. Daniel Liang

I pledge by honor that I will not discuss this exam with anyone until my

instructor reviews the exam in the class.

Signed by ___________________ Date _____________________

Part I:

A. (2 pts)

Fill in the missing code in the following program.

import javafx.application.Application;

A:

primaryStage.setScene(scene);

primaryStage.show();

B. (2 pts)

Show the output of the following JavaFX program.

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A:

launch application

Test constructor is invoked

start method is invoked

C. (5 pt)

Which of following statements are correct?

1. You can create and display multiple stages in JavaFX.

(Yes)

D. (3 pt)

Write the code for the following:

1. Create a line with the end points (5.5, –54) and (0.2,

–45).

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2. Create a circle with radius 5.5 centered at (5.4, –1).

3. Create a rectangle with width 8.4 and height 4.3

centered at (5.4, –1).

Part II: Write Programs

1. (5 pts) The ClockPane class presented in Listing 14.24

in text displays a clock. Use this class to display

four clocks as shown in the following figure.

Solution:

import javafx.application.Application;

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import javafx.stage.Stage;

ClockPane clock1 = new ClockPane();

clock1.setPrefSize(1000, 1000);

pane.add(clock1, 0, 0);

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pane.add(clock2, 1, 0);

// Create a scene and place it in the stage

Scene scene = new Scene(pane, 200, 200);

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2. (10 pts) Write a program that clicks the Refresh

button to display the four distinct random numbers

between 0 and 51, as shown in the following figure.

Solution:

import javafx.application.Application;

public class Exercise15_20Extra extends Application {

private Label lbl1 = new Label();

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// Create a button

Button btRefresh = new Button(“Refresh“);

btRefresh.setOnAction(e -> {

// Create a scene and place it in the stage

Scene scene = new Scene(pane, 250, 150);

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

/**

* 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);

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}

3. (15 pts) Write a program that draws a fixed rectangle

centered at (100, 60) with width 100 and height 40.

Whenever the mouse is moved, display a message

indicating whether the mouse point is inside the

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rectangle at the mouse point or outside of it, as

shown in the following figure. To detect whether a

point is inside a polygon, use the contains method

defined in the Node class.

Solution:

import javafx.application.Application;

}

text.setX(e.getX());

text.setY(e.getY());

});

// Create a scene and place it in the stage

Scene scene = new Scene(pane, 400, 250);

}

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}

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Part III: Multiple Choice Questions: (1 pts each)

(Please circle your answers on paper first. After you

finish the test, enter your choices online to LiveLab. Log

in and click Take Instructor Assigned Quiz. Choose Quiz3.

You have 5 minutes to enter and submit the answers.)

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

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

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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 {

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@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 addAll method needs to be replaced by the add method.

B. The program runs fine and displays two images.

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

D. 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”).

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

___________.

A. p.left(node);

B. p.setLeft(node);

C. p.setEast(node);

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D. p.placeLeft(node);

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

___________.

A. p.addAll(node1, node2);

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

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

D. p.add(node1, node2)

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5

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

}

/**

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* 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 runs fine and displays two circles.

C. The program has a runtime error since the circle is added to a

pane twice.

D. The program runs fine and displays one circle.

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

A. pane.removeAll(node1, node2);

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

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

D. pane.remove(node1, node2);

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Analyze the following code.

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.stage.Stage;

public class Test extends Application {

@Override // Override the start method in the Application

class

public void start(Stage primaryStage) {

// Create a button and place it in the scene

Button btOK = new Button(“OK”);

btOK.setOnAction(e –> System.out.println(“OK 1”));

btOK.setOnAction(e –> System.out.println(“OK 2”));

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Scene scene = new Scene(btOK, 200, 250);

primaryStage.setTitle(“MyJavaFX”); // 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. When clicking the button, the program displays OK2.

B. When clicking the button, the program displays OK1.

C. When clicking the button, the program displays OK1 OK2.

D. The program has a compile error, because the setOnAction

method is invoked twice.

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Suppose the following program displays a pane in the stage.

What is the output if the user presses the key for letter

B?

import javafx.application.Application;

import static javafx.application.Application.launch;

import javafx.scene.Scene;

import javafx.scene.layout.Pane;

import javafx.stage.Stage;

// import javafx classes omitted

public class Test1 extends Application {

@Override

public void start(Stage primaryStage) {

// Code to create and display pane omitted

Pane pane = new Pane();

Scene scene = new Scene(pane, 200, 250);

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

title

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

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stage

primaryStage.show(); // Display the stage

pane.requestFocus();

pane.setOnKeyPressed(e ->

System.out.print(“Key pressed ” + e.getCode() + ”

“));

pane.setOnKeyTyped(e ->

System.out.println(“Key typed ” + e.getCode()));

}

/**

* 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. Key pressed B Key typed UNDEFINED

B. Key typed UNDEFINED

C. Key pressed B Key typed

D. Key pressed B

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Suppose A is an anonymous inner class in Test. A is compiled

into a file named _________.

A. Test$A.class

B. A$Test.class

C. A.class

D. Test$1.class

E. Test&1.class

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Fill in the code below in the underline:

public class Test {

public static void main(String[] args) {

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Test test = new Test();

test.setAction(______________________________);

}

public void setAction(T1 t) {

t.m();

}

interface T1 {

public void m();

}

A. (e) –> {System.out.print(“Action 1! “)}

B. (e) –> System.out.print(“Action 1! “)

C. () –> System.out.print(“Action 1! “)

D. System.out.print(“Action 1! “)

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To handle the mouse click event on a pane p, register the

handler with p using ______.

A. p.setOnMousePressed(handler);

B. p.setOnMouseDragged(handler);

C. p.setOnMouseReleased(handler);

D. p.setOnMouseClicked(handler);

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A JavaFX action event handler is an instance of _______.

A. EventHandler<ActionEvent>

B. ActionEvent

C. EventHandler

D. Action

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Analyze the following code:

import javafx.application.Application;

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import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.layout.Pane;

import javafx.scene.layout.FlowPane;

import javafx.stage.Stage;

public class Test extends Application {

@Override // Override the start method in the Application

class

public void start(Stage primaryStage) {

Pane pane = new FlowPane();

Button bt1 = new Button(“Java”);

Button bt2 = new Button(“Java”);

Button bt3 = new Button(“Java”);

Button bt4 = new Button(“Java”);

pane.getChildren().addAll(bt1, bt2, bt3, bt4);

Scene scene = new Scene(pane, 200, 250);

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. Two buttons are displayed with the same text “Java”.

B. Three buttons are displayed with the same text “Java”.

C. One button is displayed with the text “Java”.

D. Four buttons are displayed with the same text “Java”.

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The method __________ gets the contents of the text field

tf.

A. tf.findString()

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B. tf.getText()

C. tf.getText(s)

D. tf.getString()

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for your grade.

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