JAP Hybrid 4

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Questions and Answers

Which statement accurately describes the difference between ASCII and UNICODE character encoding standards?

  • ASCII is primarily for representing text in non-English languages, while UNICODE is for English.
  • UNICODE is designed to handle text expressed in most of the world's writing systems, while ASCII supports only 128 characters. (correct)
  • ASCII supports a wider range of characters than UNICODE.
  • UNICODE uses a fixed number of bits to represent each character, whereas ASCII uses a variable number.

In the context of Swing text components, what is the primary role of the JTextComponent class?

  • It serves as a superclass, offering a configurable foundation for text manipulation in various Swing text components. (correct)
  • It is used for handling styled text and complex text requirements exclusively.
  • It provides a specific implementation for single-line text input.
  • It directly manages the display of text in read-only mode.

How can a JTextArea be configured to prevent text input by the user?

  • By disabling the keyboard listener for the component.
  • By using the `setText()` method to display text without allowing modifications.
  • By using the `setEnabled(false)` method.
  • By setting the "editable" property to `false` using the `setEditable(false)` method. (correct)

What is the key distinction between JTextField and JTextArea in Swing?

<p><code>JTextField</code> is designed for single-line text input, and <code>JTextArea</code> is for multi-line text input. (D)</p>
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What happens when the Enter key is pressed within a JTextArea?

<p>It moves the cursor to the beginning of the next line within the <code>JTextArea</code>. (D)</p>
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In the context of Swing text components, what capabilities are provided by the methods getText() and setText()?

<p><code>getText()</code> is used to retrieve text, and <code>setText()</code> is used to display text in the component. (B)</p>
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Which interface is utilized by text components to serve as a container for text?

<p><code>Document</code> (A)</p>
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In JavaFX, what enhanced capabilities are offered by TextField and TextArea controls?

<p>Support for prompt text and a right-click context menu for basic editing. (D)</p>
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What is the primary purpose of a class diagram in software development?

<p>To create a static visualization, showcasing the structure, classes, attributes, and relationships within a system. (C)</p>
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Which of the following considerations is essential when drawing a class diagram?

<p>Ensuring a meaningful name for the class diagram. (A)</p>
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In a class diagram, what do attributes and methods represent?

<p>Characteristics (data) and actions (responsibilities) of each class, respectively. (B)</p>
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What is the correct way to copy, cut, and paste in both JTextField and JTextArea?

<p>By using Ctrl-C, Ctrl-X, and Ctrl-V respectively. (C)</p>
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For what purpose is the setEditable(boolean b) method used in JTextField and JTextArea?

<p>To select whether the text component can be edited or not. (A)</p>
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What determines whether a text component can be used to input and edit text?

<p>The <code>setEditable(boolean b)</code> method. (B)</p>
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Which types of text do both text components JTextField and JTextArea work with?

<p>Unformatted text. (B)</p>
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What is the ultimate goal for the Document interface?

<p>To scale from simple needs, such as a plain text field, to more complex needs, such as an HTML or XML document. (B)</p>
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In the sales order system class diagram, what does the +calcTax() method in the Order class likely represent?

<p>A function to calculate the tax amount for the order. (D)</p>
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What does the '1..*' notation signify next to the OrderDetail class in relation to the Order class?

<p>An order must have at least one, and potentially many, associated order details. (C)</p>
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What is the significance of specifying a minimum number of desired properties when creating a class diagram?

<p>It leads to simpler diagrams and avoids unnecessary complexity. (A)</p>
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In a class diagram representing a sales order system, what does the Item class's -description: String attribute indicate?

<p>The item's description can only be modified by the class itself. (D)</p>
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Flashcards

ASCII

A character encoding standard for electronic communication; uses 7 bits to represent a character.

UNICODE

A computing industry standard for encoding, representation, and handling text; uses 8, 16, or 32 bits.

Swing text components

Swing components that allow users to display and edit text.

JTextField

A Swing text component that accepts only a single line of text.

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JTextArea

A Swing text component that provides a multi-line editor area.

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JTextComponent

Base class for Swing text components; tries to be compatible with java.awt.TextComponent.

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Document (in text components)

An interface serving as a container for text, modeling text for text components.

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JavaFX text controls

JavaFX controls with enhanced capabilities for text input and display.

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Class Diagram

A diagram representing the static view and major aspects of a software application.

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Study Notes

Inputs, Outputs, and Events

About Input / Output

  • Data utilizes characters representing words and symbols of human speech.
  • Characters are coded based on standards like ASCII and UNICODE, assigning numeric values to letters, numbers, and symbols.

ASCII vs. UNICODE

  • ASCII is a character encoding standard for electronic communication.

    • It stands for American Standard Code for Information Interchange.
    • ASCII supports 128 characters.
    • It uses 7 bits to represent a character.
    • It requires less space.

  • UNICODE is an industry standard for encoding, representation, and handling text in most of the world's writing systems.

    • It stands for Universal Character Set.
    • UNICODE supports a wide range of characters.
    • It uses 8bit, 16bit, or 32bit depending on the encoding type.
    • It requires more space.

  • In word processing and desktop publishing, input/output refers to the main portion of a document, excluding elements like headlines, tables, and footnotes.

Swing Text Components

  • Swing text components enable users to display and edit text input.

  • Swing offers seven text components.

    • JTextField
    • JFormatedTextField
    • JTextArea
    • JPasswordField
    • JEditorPane
    • JTextPane

  • All Swing text components inherit from JTextComponent.

    • JTextComponent provides a configurable foundation for text manipulation.

  • JTextField and JTextArea are frequently-used components.

  • The setEditable(boolean b) method determines if a text component is for input/edit (true) or display only (false).

  • The getText() and setText() methods are used to get user inputted text, and display text in the text component.

  • The basic editing operations are supported.

    • insert
    • delete
    • backspace
    • copy (Ctrl-C)
      • cut (Ctrl-X)
      • paste (Ctrl-V)

  • Both components work with plain, unformatted text.

JTextField vs. JTextArea

  • JTextField is a control in Java AWT that allows users to edit a single line of text.

    • It extends TextComponent.
    • It helps to enter a single line of text.

  • JTextArea is a control in Java AWT that provides a multi-line editor area.

    • It also extends TextComponent.
    • It is helpful for entering multiple lines of text.

  • JTextField only accepts a single line of text, while JTextArea can work with multiple lines.

  • JTextField generates an ActionEvent when the Enter key is pressed.

  • JTextArea simply moves the cursor to the next line is the Enter key is pressed.

  • The user interface needs an additional component (usually a button) to get the text from a text area.

  • JTextComponent is the base class for Swing text components.

  • Document is an interface used by text components, serving as a container for text that acts as the model for Swing text components.

Text in JavaFX

  • JavaFX provides similar controls with enhanced capabilities.
    • TextField
    • TextArea
    • PasswordField
    • HTMLEditor
  • JavaFX TextField and TextArea support prompt text and provide a right-click context menu for basic editing.
  • Tree derivations:
  • javafx.scene.control.TextInputControl
  • javafx.scene.control.TextArea
  • javafx.scene.control.TextField
  • javafx.scene.control.PasswordField

Class Diagram - Part II

  • The class diagram creates software applications.
    • It provides a static view of the system and aspects of an application
  • A class diagram has key points such as a meaningful name to the class diagram, objects and their relationships acknowledged, and knowlege of each class' attributes and methods.
  • Minimum specified properties should be desired, can lead to more properties of the unwanted category for a complex diagram.
  • Diagrams should be redrawn and reworked.

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