Java GUI Development: BorderLayout, Frame & Dialog Box
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Questions and Answers

What are the two types of scrollbars available in the AWT package?

  • Horizontal and Vertical (correct)
  • Diagonal and Vertical
  • Horizontal and Circular
  • Vertical and Square

    • Which of the following constructors creates a vertical scrollbar?

  • Scrollbar(int thumb_size)
  • Scrollbar(int type)
  • Scrollbar(int type, int initial_value, int thumb_size, int min_value, int max_value)
  • Scrollbar() (correct)

    • What does the method getMaximum() return?

  • The maximum value set for the scrollbar (correct)
  • The thumb size of the scrollbar
  • The initial value of the scrollbar
  • The current position of the scrollbar

    • What is the purpose of the scrollbar(int type, int initial_value, int thumb_size, int min_value, int max_value) constructor?

    <p>To customize the scrollbar with specified initial values and size</p> Signup and view all the answers

    In the ScrollbarDemo class, what is being set with the setLayout(null) method?

    <p>No layout, allowing absolute positioning of components</p> Signup and view all the answers

    What layout is used in the BorderLayoutDemo class?

    <p>BorderLayout</p> Signup and view all the answers

    Which region does the button labeled 'NORTH REGION' occupy in the BorderLayout?

    <p>North</p> Signup and view all the answers

    What is the purpose of a dialog box?

    <p>To obtain user input</p> Signup and view all the answers

    What characterizes a model dialog?

    <p>Blocks access to other parts of the program until closed</p> Signup and view all the answers

    Which method is used to make the BorderLayoutDemo window visible?

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

    What is a significant difference between a model dialog and a modeless dialog?

    <p>Modeless dialog allows access to other windows, while model dialog does not</p> Signup and view all the answers

    What does the constructor 'Dialog(Frame parentwindow, boolean mode)' create?

    <p>A dialog based on parent window and mode</p> Signup and view all the answers

    What background color is set for the BorderLayoutDemo window?

    <p>Cyan</p> Signup and view all the answers

    What layout is used in the TextAreaDemo constructor?

    <p>FlowLayout</p> Signup and view all the answers

    Which method is crucial for setting the menubar in a window?

    <p>void setMenuBar(MenuBar object)</p> Signup and view all the answers

    What component contains Menus in the Abstract Window Toolkit?

    <p>MenuBar</p> Signup and view all the answers

    How is an empty Menu created using the Menu class?

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

    Which of the following constructors allows the creation of a Menu with a specified name?

    <p>Menu(String str)</p> Signup and view all the answers

    What happens if the flag parameter in the Menu constructor is set to false?

    <p>The Menu remains attached to the MenuBar.</p> Signup and view all the answers

    Which of the following is not a correct method of the Menu class?

    <p>void setTitle(String title)</p> Signup and view all the answers

    What is the purpose of the MenuItem constructor MenuItem(String str)?

    <p>Creates a MenuItem with the specified name.</p> Signup and view all the answers

    What is the purpose of the setVisible method in a Frame?

    <p>To determine if the frame is displayed or hidden</p> Signup and view all the answers

    Which constructor creates a Frame window without a title?

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

    What does the setSize method do in the Frame class?

    <p>It sets the dimensions of the frame</p> Signup and view all the answers

    Which line of code correctly initializes a Frame window with the title 'VJTech Academy'?

    <p>Frame frame = new Frame(); frame.setTitle('VJTech Academy');</p> Signup and view all the answers

    What type of information can be displayed in a Frame window?

    <p>Graphics and text</p> Signup and view all the answers

    Which method is used to set the background color of a Frame in the provided examples?

    <p>setBackground(Color.colorName)</p> Signup and view all the answers

    What does the method paint(Graphics g) do in the MyFrame class?

    <p>It draws graphics onto the Frame</p> Signup and view all the answers

    In the FrameDemo example, what is the significance of calling f1.setVisible(true);?

    <p>It makes the frame visible to the user</p> Signup and view all the answers

    What is the purpose of the method 'setEnabled(boolean flag)' in the MenuItem class?

    <p>To set the enabled state of the menu item.</p> Signup and view all the answers

    Which constructor will create a CheckboxMenuItem with a given label and an initial state?

    <p>CheckboxMenuItem(String str, boolean flag)</p> Signup and view all the answers

    What type of layout is used in the NotePadDemo class?

    <p>FlowLayout</p> Signup and view all the answers

    What does the method 'getState()' in the CheckboxMenuItem class return?

    <p>The current state of the checkbox (checked or unchecked).</p> Signup and view all the answers

    Which of the following methods is NOT provided by the MenuItem class?

    <p>boolean getLabel()</p> Signup and view all the answers

    In the Menu class within the NotePadDemo, which menu option is added first?

    <p>New</p> Signup and view all the answers

    What does the constructor 'MenuItem(String str, MenuShortcut key)' allow you to do?

    <p>Create a new menu item with a shortcut key.</p> Signup and view all the answers

    Which menu items are included in the 'Edit' menu of the NotePadDemo?

    <p>Cut, Copy, Paste, Delete</p> Signup and view all the answers

    Study Notes

    BorderLayout

    • A BorderLayout arranges components in five regions: North, South, East, West, and Center.
    • The BorderLayout is used to organize the content of a window, often for placement of main menu or toolbars.
    • Regions can only hold one component and stretch to fill the available space.

    Frame

    • A Frame is a top-level window with title bar, menu bar, resizing corner, and other features.
    • It is a fundamental component used as the base for GUI applications.
    • Constructors:
      • Frame(): Creates a frame without a title.
      • Frame(String title): Creates a frame with the specified title.
    • Methods:
      • setVisible(true/false): Makes the frame visible or invisible.
      • setSize(int width,int height): Sets the width and height of the frame as specified.
      • setTitle(String title): Sets the title of the Frame.

    Dialog Box

    • A Dialog Box is a window that provides additional information or gathers input from the user. It is a child window of another window, often a Frame.
    • Types:
      • Model Dialog: User input is directed to the dialog box, and the main program is blocked until the dialog box is closed.
      • Modeless Dialog: Input focus can be directed to other windows without blocking the program.
    • Constructors:
      • Dialog(Frame parentwindow, boolean mode): Creates a dialog box associated with a specified parent window and determines whether it is modal or modeless.
      • Dialog(Frame parentwindow, String str, boolean mode): Creates a dialog box with a title and a specified parent window.

    Text Area

    • A TextArea is an area for displaying or editing multiple lines of text.
    • It can contain scrollbars to navigate the text.
    • Constructors:
      • TextArea(): Creates an empty text area.
      • TextArea(int rows, int columns): Creates a text area with the specified number of rows and columns.
      • TextArea(String text, int rows int columns, int scrollbar): Creates a text area with specified text, rows, columns, and potentially adding scroll bars.

    Scrollbar

    - A Scrollbar is a component that allows users to move through a large amount of content.
- Types:
	- **Horizontal Scrollbar**: Allows navigating horizontally across content.
	- **Vertical Scrollbar**: Allows navigating vertically across content. 
- **Constructors**:
	- `Scrollbar()`: Creates a vertical scrollbar. 
	- `Scrollbar(int type)`: creates vertical or horizontal scrollbar based on `type`.
	- `Scrollbar(int type, int intial_value, int thumb_size, int min_value, int max_value);` 
- **Methods**:
	- `setValues(int initial_value, int thumb_size, int min_value, int max_value);`: Updates the scrollbar's values.
	- `getMinimum()`, `getMaximum()`, `getValue()`, `setValue(int value)`: Retrieve and set the scrollbar's values.
    • A MenuBar is a top-level container used to create menus that provide options to users.
    • It is typically found at the top of a frame or window.
    • It organizes menus into separate sections.
    • MenuBar Class:
      • Constructor: MenuBar(): Creates an empty menu bar.
      • Methods: void setMenuBar(MenuBar object): Sets the menu bar for a frame.
    • Menu Class:
      • Constructors:
        • Menu(): Creates an empty menu.
        • Menu(String str): Creates a menu with a specified title.
        • Menu(String str, boolean flag): Creates a menu with a specified title, and flag can control whether the pop-up menu can be free-floating.
    • MenuItem Class:
      • Constructors:
        • MenuItem(): Creates an empty menu item.
        • MenuItem(String str): Creates a menu item with a specified label.
        • MenuItem(String str, MenuShortcut key): Creates a menu item with a label and optionally a keyboard shortcut.
      • Methods:
        • void setEnabled(boolean flag), boolean isEnable(): Sets the enabled or disabled state of the menu item.
        • void setLabel(String str): Sets the label of the menu item.
        • String getLabel(): Retrieves the label of the menu item.

    CheckboxMenuItem

    • A CheckboxMenuItem is a type of menu item that can be checked (or unchecked) to indicate a selection.
    • Constructors:
      • CheckboxMenuItem(): Creates an empty checkbox item.
      • CheckboxMenuItem(String str): Creates a checkbox item with a specific label.
      • CheckboxMenuItem(String str, boolean flag): Creates a checkbox item with a label and an initial state (checked or unchecked).
    • Methods:
      • void setState(boolean flag): Sets the state of the checkbox item (checked or unchecked).
      • boolean getState(): Retrieves the current state of the checkbox item.

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    Related Documents

    Unit-I Notes Advance Java.pdf

    Description

    This quiz covers essential concepts in Java GUI development including the usage of BorderLayout, Frame creation, and dialog boxes. Test your knowledge of how these components function and their importance in building user interfaces. Perfect for beginners looking to solidify their understanding of GUI elements in Java.

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