Lecture 2

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Questions and Answers

Which of the following statements correctly describes the relationship between `JComponent`, `Container`, and `Component` classes in Swing?

`Container` extends `JComponent`, which extends `Component`.
`Component` extends `JComponent`, which extends `Container`.
`JComponent` extends `Component`, which extends `Container`.
`JComponent` extends `Container`, which extends `Component`. (correct)

When using a root pane in a Swing application, which layer is positioned directly above all other components, acting as a transparent overlay?

Content pane
Glass pane (correct)
Layered pane
Root pane

Why might a developer choose to use pre-defined containers like `JFrame` over creating a custom container?

Custom containers always offer better performance than pre-defined ones.
Custom containers are easier to implement and require less code.
Pre-defined containers offer proper event handling, pre-configured facilities, and more concise code. (correct)
Pre-defined containers allow for more unique visual customization options.

A developer wants to add a brief description that appears when a user hovers their mouse over a `JButton`. Which `JComponent` functionality should they utilize?

Tool tips (A) Signup and view all the answers

A software engineer aims to modify the appearance of a `JPanel` to match the user's operating system. Which `JComponent` functionality should they employ?

Pluggable look and feel (A) Signup and view all the answers

Which of the following statements best describes the relationship between AWT and Swing?

Swing components are lightweight and built on top of the AWT framework, providing platform independence. (A) Signup and view all the answers

What is the primary purpose of calling `frame.pack()` in a Swing application?

It automatically sizes the frame to fit its contents. (D) Signup and view all the answers

In the given code example, what is the significance of `frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);`?

It terminates the application when the frame is closed. (D) Signup and view all the answers

Which Swing component is being used in the `SwingHelloWorld` example to display the text 'Hello World!'?

JLabel (C) Signup and view all the answers

What is the purpose of the `frame.getContentPane().add(lblText);` line in the `SwingHelloWorld` code?

It adds the label component to the content pane of the frame. (D) Signup and view all the answers

What is the best approach or first step typically used for setting the initial size of a JFrame in a Swing application?

Using <code>frame.setMinimumSize()</code> to ensure a certain size, then let <code>pack()</code> adjust as needed. (C) Signup and view all the answers

In the context of Swing and JavaFX, which term is more commonly used to refer to interactive elements like buttons and text fields in JavaFX?

Controls or Widgets (A) Signup and view all the answers

What layout characteristic might require you to use `frame.pack()` after adding components to a `JFrame`?

When components have preferred sizes that should be respected. (A) Signup and view all the answers

In JavaFX, what class do all controls inherit from?

Node (B) Signup and view all the answers

Which of the following is NOT a generally useful top-level container class in Swing?

JComponent (A) Signup and view all the answers

In the context of GUI components, what is a containment hierarchy?

The structure that defines how components are nested within each other. (A) Signup and view all the answers

Which of the following statements is true regarding GUI components and top-level containers?

A GUI component can only be contained once in a containment hierarchy. (C) Signup and view all the answers

What is the primary purpose of a content pane in a top-level container?

To hold the visible components of the GUI. (A) Signup and view all the answers

In the provided JavaFX code example, what is the purpose of the `setOnAction` method?

To define the action that occurs when the button is clicked. (D) Signup and view all the answers

In the provided JavaFX code, what is the role of the `StackPane`?

It manages the arrangement of nodes in a back-to-front order. (B) Signup and view all the answers

If you want to add a menu bar to a `JFrame`, where should you typically add it?

To the <code>JMenuBar</code> object, then set it to the <code>JFrame</code>. (A) Signup and view all the answers

Which of the following is a key difference between Swing components and AWT components?

Swing components include a wider range of GUI elements, such as trees and tables, which are not present in AWT. (B) Signup and view all the answers

In the context of GUI development in Java, what is the primary distinction between JavaFX 'controls' and Swing components?

JavaFX controls all inherit from the <code>Node</code> class, reflecting a different class hierarchy compared to Swing components. (D) Signup and view all the answers

Suppose you're migrating a GUI application from AWT to Swing. Which component would you use as a direct replacement for the AWT `Choice` component?

JComboBox (D) Signup and view all the answers

What is the main purpose of adhering to Java code conventions, such as the 'Google Java Style Guide'?

To improve code readability, maintainability, and consistency across a project or team. (A) Signup and view all the answers

You are refactoring an old AWT-based application to use Swing components. Which of the following is a valid Swing component to replace a basic AWT button?

JButton (C) Signup and view all the answers

Imagine you need to display a long text document within a scrollable area in a Swing application. Which component is most suitable for this purpose?

JScrollPane (B) Signup and view all the answers

Which of the following scenarios would best justify the use of a `JFileChooser` component in a Swing application?

Allowing users to select one or more files or directories from their file system. (A) Signup and view all the answers

In a Java Swing application, you want to create a container that allows you to switch between multiple panels, each displaying different content. Which Swing component is most appropriate for this?

JTabbedPane (B) Signup and view all the answers

What is the recommended approach for incorporating lambda expressions into your code?

Use suggestions from your IDE to guide lambda expressions. (B) Signup and view all the answers

Where can you find code examples demonstrated during the lectures according to the slides?

On Brightspace, under 'Weeks > Week NN > Code Examples'. (C) Signup and view all the answers

In the Java 17 command-line compilation example, what does the `--add-modules javafx.controls` option achieve?

It includes the JavaFX controls module required for GUI applications. (A) Signup and view all the answers

What is the purpose of the `SET JAVA_HOME` command in the minimal script for multiple JDK versions?

It specifies the location of the Java Development Kit (JDK). (A) Signup and view all the answers

In the Java 8 command-line compilation example, what does the `-cp` option specify?

The classpath for finding user-defined classes and libraries. (B) Signup and view all the answers

Examine the following command from Java 17 command line compilation: `javac --module-path ".;C:\SOFT\javafx\lib" --add-modules javafx.controls -cp ".;bin" src/CST8221/Main.java -d bin`. What is the purpose of `-d bin`?

Specifies the output directory for compiled class files. (A) Signup and view all the answers

In the Java 8 command line script demonstrations, what command is used to test the environment configuration?

<code>java –version</code> (D) Signup and view all the answers

Examine the following command from Java 8 command line execution: `java -cp ".;bin;c:/SOFT/javafx/lib" CST8221.Main 1 1`. What arguments are being passed into the `main` method??

1 1 (A) Signup and view all the answers

Flashcards

What is Swing?

A GUI toolkit that is part of the Java Foundation Classes (JFC).

What does GUI mean?

Graphical user interface.