Java Swing Components Overview
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Questions and Answers

What layout manager is used in the class check?

  • BorderLayout
  • GridLayout
  • BoxLayout
  • FlowLayout (correct)

What is the function of the ButtonGroup in the radio class?

  • To add a label to the buttons
  • To ensure only one radio button is selected (correct)
  • To display a list of options
  • To group multiple checkboxes together

What type of component is used to create a dropdown box in the Combo class?

  • JTextField
  • JCheckBox
  • JComboBox (correct)
  • JButton

Which component is best suited for selecting one option from many?

<p>JRadioButton (C)</p> Signup and view all the answers

What happens when a JButton is pressed?

<p>It generates an event. (B)</p> Signup and view all the answers

What is the purpose of a JScrollPane?

<p>To display large components in a scrollable view (D)</p> Signup and view all the answers

Which of these descriptions correctly defines JCheckBox?

<p>A component that allows multiple selections. (C)</p> Signup and view all the answers

What is the statement used to add items to a JComboBox?

<p>addItem() (A)</p> Signup and view all the answers

What is a key advantage of using Java Swing over AWT?

<p>Swing provides platform-independent and lightweight components. (C)</p> Signup and view all the answers

In the context of Swing API architecture, what role does the Model play?

<p>It stores and manages the component's data. (A)</p> Signup and view all the answers

Which of the following is a feature of Swing components?

<p>Swing offers rich controls like Tree and TabbedPane. (D)</p> Signup and view all the answers

What does the 'Look and Feel' feature of JFC provide?

<p>It helps in providing a consistent appearance across different platforms. (A)</p> Signup and view all the answers

Which statement accurately describes JApplet?

<p>It is a special kind of applet specific to the Swing environment. (A)</p> Signup and view all the answers

What is the primary purpose of the Controller in the MVC architecture of Swing?

<p>To respond to user input and update the Model. (C)</p> Signup and view all the answers

Which of the following Swing components does NOT belong to the javax.swing package?

<p>JListView (A)</p> Signup and view all the answers

What distinguishes the customization feature of Swing components?

<p>Visual appearance is independent of internal data representation. (A)</p> Signup and view all the answers

What is the primary purpose of the JLabel class in Java Swing?

<p>To display text, an image, or both (D)</p> Signup and view all the answers

Which method of the ImageIcon class retrieves the height of the icon?

<p>getIconHeight() (D)</p> Signup and view all the answers

In the context of Java Swing, what is the role of the Container class?

<p>To hold components and manage their layout (A)</p> Signup and view all the answers

What happens when a JCheckBox is clicked?

<p>It changes its state between 'on' and 'off' (D)</p> Signup and view all the answers

Which method is used to add a component to a content pane in a Container?

<p>add() (A)</p> Signup and view all the answers

What is the consequence of using the setLayout(null) method in a JFrame?

<p>Components must be positioned manually (B)</p> Signup and view all the answers

What constructor parameter is used to create an ImageIcon from a file?

<p>ImageIcon(String filename) (C)</p> Signup and view all the answers

In the provided JLabel example, what layout manager is being utilized?

<p>FlowLayout (B)</p> Signup and view all the answers

Flashcards

Swing GUI

Swing is a part of Java Foundation Classes (JFC) used to create window-based applications, offering platform-independent components.

AWT

Abstract Windowing Toolkit; an older Java GUI toolkit, used as a foundation for Swing.

MVC Architecture

A software design pattern segregating an application's concerns as Model (data), View(display) and Controller(user interaction).

Swing Components

Pre-built visual elements (e.g., buttons, text fields, checkboxes) used to construct GUIs.

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Lightweight Components

GUI components (Swing) not directly tied to the operating system, improving performance.

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Pluggable Look-and-Feel

Swing's ability to change the appearance of components without changing the code.

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JApplet

A type of Swing component embedded within web pages.

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JButton Constructor

A JButton constructor initializes a push button with a label, allowing for clicking and image display.

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JRadioButton Functionality

A JRadioButton creates a radio button to select one option from a set of choices.

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ButtonGroup Class

The ButtonGroup class groups radio buttons, allowing only one to be selected at a time.

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JComboBox

A drop-down list component that allows users to select an item from a list.

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JComboBox addItem Method

Extends JComboBox adding items to the list of selectable values.

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JscrollPane Function

Displays a component with scrolling capabilities, facilitating the display of large or dynamic components.

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getContentPane()

A method used to get the content pane of a container, which is the primary region for adding components.

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add(component)

Adds a component to a container (like a content pane).

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ImageIcon

A Swing class that displays images in a program.

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ImageIcon Constructor (String filename)

Creates an ImageIcon from an image file.

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ImageIcon Constructor (URL location)

Creates an ImageIcon from an image located online.

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getIconHeight()

Returns the height of the image.

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getIconWidth()

Returns the width of the image.

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getImage()

Returns the Image object associated with the ImageIcon.

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paintIcon(c, g, x, y)

Method to display the image with specific parameters.

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setImage(Image image)

Changes the image associated with the ImageIcon.

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JLabel

A Swing component for displaying text and/or images.

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JLabel Constructor

Constructor for a JLabel component to display text and optionally an image, specifying alignment.

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JFrame

A window frame in a Swing application.

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JCheckBox

Creates a check-box component in Swing.

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Study Notes

Swing Components

  • Swing is a part of Java Foundation Classes (JFC)
  • Used to create window-based applications
  • Built on top of AWT (Abstract Windowing Toolkit)
  • Platform-independent and lightweight components
  • javax.swing package provides swing API classes
  • Examples: JButton, JTextField, JRadioButton, JComboBox, JCheckBox, JTabbedPane, JScrollPane, Jtree, JTable, JProgressBar

AWT vs Swing

  • AWT components are platform-dependent while Swing components are platform-independent
  • AWT components are heavyweight while Swing components are lightweight
  • AWT doesn't support pluggable look and feel; Swing supports pluggable look and feel
  • AWT provides fewer components compared to Swing; Swing has more powerful components (e.g., tables, lists, scroll panes, color choosers, tabbed panes)
  • AWT doesn't follow MVC (Model-View-Controller) design pattern; Swing follows MVC

MVC Architecture

  • Swing follows a loosely based MVC architecture
  • Model: Represents component data
  • View: Represents the visual representation of the component's data
  • Controller: Takes user input from the view and modifies the component's data.
  • Swing components have a separate Model element, while the View and Controller are combined in the UI elements

Swing Features

  • Lightweight: Independent of native OS APIs; rendered using Java code
  • Rich controls: Includes more advanced controls (e.g., trees, tabbed panes, sliders)
  • Highly Customizable: Visual appearance independent of internal representation
  • Pluggable look-and-feel: Application look and feel can be changed at runtime based on available values

JApplet

  • Represents a Swing applet
  • Subclass of the Applet class
  • Used for creating applets that use Swing components
  • Components are added to the content pane

ImageIcon

  • Implements the Icon interface for painting images in Swing
  • Constructor: ImageIcon(String filename), ImageIcon(URL location)
  • Methods: getIconHeight(), getIconWidth(), getImage(), paintIcon(), setImage()

JLabel

  • Displays text, images, or both
  • Constructors: JLabel(), JLabel(String), JLabel(Icon), JLabel(String, Icon, horizontalAlignment)

JCheckBox

  • A graphical control used to create a checkbox
  • Changes its state between "on" or "off"
  • Inherits the JToggleButton class

JButton

  • An implementation of a push button
  • Generates an event when pressed
  • Can have text or images

JRadioButton

  • Used to create radio buttons
  • Allows selecting one from multiple options

JComboBox

  • Creates dropdown (combo) boxes
  • Used to select options from a list
  • Constructors: JComboBox(), JComboBox(Object[] items), JComboBox(Vector<?> items)
  • Methods: addItem(), removeItem(), removeAllItems(), setEditable(), addActionListener(), addItemListener()

JScrollPane

  • Makes portions of a larger component scrollable
  • Constructors: JScrollPane(), JScrollPane(Component), JScrollPane(Component, int, int)
  • Constants for scroll bar policies: VERTICAL_SCROLLBAR_AS_NEEDED, HORIZONTAL SCROLLBAR_ALWAYS, etc

JTree

  • Displays hierarchical data in a tree structure
  • Inherits JComponent
  • Uses DefaultMutableTreeNode for creating nodes and representing hierarchical relationships.

JTabbedPane

  • Used to switch between components using tabs
  • Contains add() method for adding components to tabs

JTable

  • Displays data in a tabular (row/column) format

JProgressBar

  • Displays the progress of a task in a progress bar
  • Constructors include JProgressBar() and various constructors based on maximum or minimum values and orientation.

JSeparator

  • Creates dividers in a layout
  • Constructor: JSeparator(), JSeparator(int orientation) (for vertical dividers)

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Related Documents

Ch no 2 Swings.pdf

Description

This quiz covers key concepts related to Java Swing components, including their characteristics and differences from AWT. Participants will learn about the platform-independent nature of Swing, its lightweight components, and the MVC architecture that Swing adheres to. Test your knowledge of these essential elements of window-based application development in Java.

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