Lecture 5

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Questions and Answers

Which method should be called to ensure an application terminates when a `JFrame` is closed, releasing resources?

`setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE)`
`setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE)`
`setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE)`
`setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)` (correct)

Which of the following GUI elements allows users to select one or more options from a displayed list?

List (correct)
Menu
Frame
Dialog

What is the primary purpose of a Dialog element in a GUI?

To define the overall layout of the application.
To serve as the main window of an application.
To display a persistent list of options.
To present temporary information or request input from the user. (correct)

In the context of GUI programming with Swing, what is the significance of setting the size of a `JFrame`?

It sets the initial dimensions (width and height) of the window. (A) Signup and view all the answers

If a `ListFrame` object needs to be displayed on the screen, which method must be called after its creation and size configuration?

<code>setVisible(true)</code> (C) Signup and view all the answers

What is the primary role of a `JProgressBar`?

To visually represent the progression of a task, requiring manual updates to reflect actual progress. (D) Signup and view all the answers

What is the purpose of calling the `close()` method in the event handler when a user clicks the Cancel button in a progress monitor dialog?

To dismiss the progress monitor dialog box. (D) Signup and view all the answers

Which code snippet correctly initializes a `JProgressBar` to display a progress range from 0 to 1000?

<code>JProgressBar progressBar = new JProgressBar(0, 1000);</code> (B) Signup and view all the answers

What does the `setJMenuBar` method do in the context of a `JFrame` object?

It adds a menu bar to the top of the <code>JFrame</code>. (B) Signup and view all the answers

In the context of creating menus in Java Swing, what is the purpose of a `JMenuItem`?

It represents an individual item that can be selected within a menu. (C) Signup and view all the answers

In the `ListFrame` class, what is the role of `ListSelectionListener`?

It updates the background color of the content pane based on the selected color in the JList. (D) Signup and view all the answers

What is the purpose of the `setVisibleRowCount(5)` method in the `ListFrame` class?

Specifies that the <code>JList</code> should display five rows at a time without scrolling. (B) Signup and view all the answers

How does the `ListFrame` ensure that the color options are scrollable if they exceed the visible row count?

By embedding the <code>JList</code> inside a <code>JScrollPane</code>. (C) Signup and view all the answers

What is the primary function of a splash screen in a Java application?

To indicate that the application is loading, advertise the product, or provide basic information during startup. (D) Signup and view all the answers

In the context of a progress bar, what does 'indeterminate mode' signify?

The progress bar displays animation to indicate that a task is in progress, but the completion time isn't known. (B) Signup and view all the answers

Which methods would be used to define the range of a `JProgressBar`?

<code>setMinimum()</code> and <code>setMaximum()</code> (C) Signup and view all the answers

Which line of code correctly sets up the `JList` to only allow a user to select a single color at a time?

<code>colorJList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);</code> (A) Signup and view all the answers

What does `getContentPane().setBackground(colors[colorJList.getSelectedIndex()]);` achieve in the `ListSelectionListener`'s `valueChanged` method?

Sets the background color of the entire <code>JFrame</code> content pane to the selected color. (B) Signup and view all the answers

In the provided code snippet for displaying dialogs, what is the primary benefit of using a `switch` statement with predefined `TYPE_` constants?

It centralizes the logic for different dialog types, making the code more organized, readable, and maintainable. (C) Signup and view all the answers

Based on the execution examples provided, what is the role of the `-cp` option when compiling and running the `CST8221.Main` Java program?

It sets the classpath, which tells the Java compiler and runtime where to find the necessary class files and libraries. (D) Signup and view all the answers

What does the phrase 'Avoid “gold-plating”' suggest in the context of software development, according to the material?

Adding excessive features or enhancements that are not essential to the core functionality of the application. (B) Signup and view all the answers

What is the significance of the statement 'Being functional is not enough!' in the context of software development?

The software needs to be efficient, maintainable, and well-designed, not just produce the correct output. (A) Signup and view all the answers

Why is usability an important consideration when designing software, as highlighted in 'RULE 1'?

To make the software easy to understand and use, thus improving user satisfaction and efficiency. (A) Signup and view all the answers

In the context of the JAP lecture, what is the most likely meaning of 'Creative Commons' in relation to the code examples provided?

The code examples are open-source and can be freely used, modified, and distributed with proper attribution. (C) Signup and view all the answers

A developer modifies the game's user interface, introducing a detailed animation sequence that plays upon level completion; however, this animation delays the transition to the next level by several seconds. According to the principles outlined, is this modification necessarily a positive change?

No, because the added delay detracts from usability and the core gameplay loop, potentially annoying players. (A) Signup and view all the answers

A development team is creating a new version of a game. One programmer suggests adding a highly complex algorithm that would make the game slightly more challenging but significantly increase the game's loading time. How should the project manager evaluate this suggestion based on the lecture's principles?

Evaluate whether the marginal increase in challenge justifies the significant increase in loading time, considering usability and player experience. (D) Signup and view all the answers

Flashcards

Additional GUI Elements

GUI elements such as menus and dialogs.

Lists (in GUI)

A component that displays a scrollable list of items.

JFrame.EXIT_ON_CLOSE vs. DISPOSE_ON_CLOSE

Specifies how a JFrame should behave when the close button is pressed; DISPOSE_ON_CLOSE releases resources.