Programming Languages Chapter 12 Javafx Section Introduction Which The Following Statements False Graphical User Interface

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Chapter 25: JavaFX

Section 12.1 Introduction

12.1 Q1: Which of the following statements is false?

a. A graphical user interface (GUI) presents a user-friendly mechanism for

interacting with an app. A GUI (pronounced “GOO–ee”) gives an app a distinctive

“look-and-feel.”

b. GUIs are built from GUI components—sometimes called controls or widgets.

c. Providing different apps with consistent, intuitive user-interface components

gives users a sense of familiarity with a new app, so that they can learn it more

quickly and use it more productively.

d. All of the above statements are true.

Section 12.2 JavaFX Scene Builder

12.2 Q1: Which of the following statements is false?

a. JavaFX Scene Builder is a standalone JavaFX GUI visual layout tool that can also be

used with various IDEs.

b. JavaFX Scene Builder enables you to create GUIs by dragging and dropping GUI

components from Scene Builder’s library onto a design area, then modifying and

styling the GUI—all without writing any code.

c. The FXML code is integrated with the program logic that’s defined in Java source

code—this integration of the interface (the GUI) with the implementation (the Java

code) makes it easier to debug, modify and maintain JavaFX GUI apps.

d. JavaFX Scene Builder generates FXML (FX Markup Language)—an XML

vocabulary for defining and arranging JavaFX GUI controls without writing any Java

code.

Section 12.3 JavaFX App Window Structure

12.3 Q1: The window in which a JavaFX app’s GUI is displayed is known as

the________.

a. main window

b. stage

c. podium

d. rostrum

ANS: b. stage

12.3 Q2: Which of the following statements is false?

a. A JavaFX GUI‘s scene graph is a tree structure of an app’s visual elements, such as

GUI controls, shapes, images, video, text and more.

b. Each visual element in the scene graph is a node—an instance of a subclass of

Node (package javafx.scene), which defines common attributes and behaviors for

all nodes in the scene graph.

c. The first node in the scene graph is known as the origin.

d. Nodes that have children are typically layout containers that arrange their child

nodes in the scene.

12.3 Q3: Which of the following statements is false?

a. The nodes arranged in a layout container are a combination of controls and

possibly other layout containers.

b. When the user interacts with a control, it generates an event. Programs can use

event handling to specify what should happen when each user interaction occurs.

c. An event handler is a method that responds to a user interaction. An FXML GUI’s

event handlers are defined in a controller class.

d. All of the above statements are true.

Section 12.4 Welcome GUI—Displaying Text and an Image

Section 12.4.1 Opening Scene Builder and Creating the File Welcome.fxml

(No questions.)

Section 12.4.2 Adding an Image to the Folder Containing Welcome.fxml

(No questions.)

Section 12.4.3 Creating a VBox Layout Container

12.4.3 Q1: Layout containers help you arrange GUI components. A VBox arranges its

nodes________.

a. left to right

b. by best fit

c. vertically from top to bottom

d. None of the above.

12.4.3 Q2: Which of the following statements is false?

a. To add a VBox to Scene Builder’s content panel, double–click VBox in the Library

window’s Containers section.

b. You also can copy and paste a VBox from the Containers section in the Library onto

Scene Builder’s content panel.

c. You also can drag-and-drop a VBox from the Containers section in the Library onto

Scene Builder’s content panel.

d. All of the above statements are true.

Section 12.4.4 Configuring the VBox Layout Container

12.4.4 Q1: A VBox’s ________ determines the layout positioning of its children.

a. margin

b. padding

c. calibration

d. alignment

Section 12.4.5 Adding and Configuring a Label

(Exercise in next section.)

Section 12.4.6 Adding and Configuring an ImageView

12.4.6 Q1: Which of the following statements is false?

a. You can set a Label’s text either by double clicking it and typing the text, or by

selecting the Label and setting its Text property in the Inspector’s Properties

section.

b. When adding controls to a VBox, each new control is placed adjacent to the

preceding ones by default.

c. To set the image to display, select the ImageView then set its Image property in

the Inspector’s Properties section.

d. To specify an ImageView’s size, set its Fit Width and Fit Height properties in the

Inspector’s Layout section.

Section 12.4.9 Previewing the Welcome GUI

(No questions.)

Section 12.5 Tip Calculator App—Introduction to Event Handling

Section 12.5.1 Test-Driving the Tip Calculator App

(No questions.)

Section 12.5.2 Technologies Overview

12.5.2 Q1: A JavaFX app’s main class directly inherits from ________.

a. Main

b. Application

c. App

d. Object

12.5.2 Q2: Which of the following statements is false?

a. Each cell in a GridPane can be empty or can hold one or more JavaFX

components, including layout containers that arrange other controls.

b. Each component in a GridPane can span multiple columns or rows.

c. A TextField (package javafx.scene.control) can accept text input or display

text.

d. A Slider (package javafx.scene.control) represents a value in the range

0.0–1.0 by default and allows the user to select a number in that range by moving

the Slider’s thumb.

12.5.2 Q3: Which of the following statements is false?

a. When the user interacts with a GUI component, the interaction—known as an

event—drives the program to perform a task.

b. For events that occur when the value of a control’s property changes, you must

create the event handler entirely using only drag and drop in Scene Builder.

c. The code that performs a task in response to an event is called an event handler.

d. For certain events you can link a control to its event-handling method by using

the Code section of Scene Builder’s Inspector window. In this case, the event-listener

interface is implemented for you to call the method that you specify.

12.5.2 Q4: Which of the following statements is false?

a. JavaFX applications in which the GUI is implemented as FXML adhere to the

Model-View-Controller (MVC) design pattern, which separates an app’s data

(contained in the model) from the app’s GUI (the view) and the app’s processing

logic (the controller).

b. The model presents the data stored in the view.

c. When a user provides input, the controller modifies the model with the given

input.

d. When the model changes, the controller updates the view to present the changed

data.

12.5.2 Q5: In a JavaFX FXML app, you define the app’s event handlers in a________

class, which defines instance variables for interacting with controls

programmatically, as well as event-handling methods.

a. view

b. model

c. controller

d. data

Section 12.5.3 Building the App’s GUI

12.5.3 Q1: Which of the following statements is false?

a. You can set a Button’s text by double clicking it, or by selecting the Button, then

setting its Text property in the Inspector window’s Properties section.

b. A GridPane column’s contents are left-aligned by default.

c. Setting a node’s Pref Width property of a GridPane column to

USE_COMPUTED_SIZE indicates that the width should be based on the widest child.

d. All of the above are true.

12.5.3 Q2: The space between a node’s contents and its top, right, bottom and left

edges is known as the ________, which separates the contents from the node’s edges.

a. margin

b. spacing.

c. padding.

d. None of the above.

12.5.3 Q3: Which of the following statements is false?

a. You can specify the default amount of space between a GridPane’s columns and

rows with its Hgap (horizontal gap) and Vgap (vertical gap) properties, respectively.

b. You can type in a TextField only if it’s “in focus”—that is, it’s the control that

the user is interacting with.

c. When you click an interactive control, it prompts for input.

d. When you press the Tab key, the focus transfers from the current focusable

control to the next one—this occurs in the order the controls were added to the GUI.

Section 12.5.4 TipCalculator Class

12.5.4 Q1: Which of the following statements is false?

a. To display a GUI, you must attach it to a Scene, then attach the Scene to the

Stage that’s passed into Application method start.

b. By default, the Scene’s size is determined by the size of the scene graph.

c. Overloaded versions of the Scene constructor allow you to specify the Scene’s

size and fill (a color, gradient or image).

d. Scene method setTitle specifies the text that appears in the Stage window’s

title bar.

12.5.4 Q2: Stage method setScene places ________.

a. the root node

b. text in the Stage window’s title bar

c. the gradient on the Stage

d. a Scene onto a Stage

12.5.4 Q3: Stage method show displays the ________.

a. Stage window

b. scene graph

c. root node

Section 12.5.5 TipCalculatorController Class

12.5.5 Q1: Class NumberFormat of package java.text provides numeric

formatting capabilities, such as ________.

a. percentage formats

b. locale-specific currency formats

c. a) and b)

d. Neither a) nor b).

12.5.5 Q2: A JavaFX Button’s event handler receives a(n) ________, which indicates

that the Button was clicked.

a. ButtonEvent

b. ObjectEvent

c. ControlEvent

d. ActionEvent

12.5.5 Q3: Which of the following statements is false?

a. As of Java SE 8, an anonymous inner class can access its top-level class’s instance

variables, static variables and methods, but has limited access to the local

variables of the method in which it’s declared—it can access only the final local

variables declared in the enclosing method’s body.

b. The @FXML annotation preceding an instance variable indicates that the variable’s

name can be used in the FXML file that describes the app’s GUI.

c. An anonymous inner class is a class that’s declared without a name and typically

appears inside a method declaration.

d. Since an anonymous inner class has no name, one object of the class must be

created at the point where the class is declared.

Section 12.6 Features Covered in the Other JavaFX Chapters

(No questions.)