Java GUI Programming - GridLayout and Panels
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Java GUI Programming - GridLayout and Panels

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Questions and Answers

What is the main purpose of the GridLayout in the provided code?

  • To manage window events.
  • To display images in a sequence.
  • To organize components in a grid structure. (correct)
  • To create a single-column layout.

    • The GridLayoutDemo class extends the JFrame to create a window interface.

    True

    What method is used to handle button events within the GridLayoutDemo class?

    actionPerformed

    In the GridLayoutDemo class, the toggle variable is used to switch between two layouts, i.e., _____ and _____ layouts.

    <p>grid1, grid2</p> Signup and view all the answers

    Match the following components with their descriptions:

    <p>JFrame = Main window container JButton = Button component that can trigger actions GridLayout = Layout manager that arranges components in a grid JPanel = Specialized AWT component for organizing other components</p> Signup and view all the answers

    Which of the following is NOT considered an action key?

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

    Modifier keys pressed are involved in determining the actions of other keys.

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

    What is the purpose of 'event.getKeyModifiersText(event.getModifiers())' in programming?

    <p>'event.getKeyModifiersText(event.getModifiers())' retrieves a string representation of the currently pressed modifier keys.</p> Signup and view all the answers

    The modifier keys include Shift, Ctrl, and _____ .

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

    Match the following keys with their function:

    <p>Shift = Capitalizes letters when pressed with an alphabet key Ctrl = Used for keyboard shortcuts like copy and paste Alt = Accesses alternate functions of keys Enter = Executes commands or confirms actions</p> Signup and view all the answers

    Study Notes

    GridLayoutDemo

    • The GridLayoutDemo class implements the ActionListener interface, uses java.awt package for graphics, javax.swing for JFrame display and java.awt.event to handle GUI events.
    • The GridLayoutDemo class uses GridLayout to organize components within a frame
    • grid1 is created with 2 rows, 3 columns, and a 5-pixel gap between components horizontally and vertically.
    • grid2 has 3 rows and 2 columns.
    • The actionPerformed() method toggles the layout of the container between grid1 and grid2 when a button is clicked.
    • toggle is a boolean variable used to control the layout change.

    Panels

    • Panels help organize components in a GUI.
    • The JPanel class is a subclass of JComponent.
    • Panels can hold other components, including other panels.

    PanelDemo

    • The PanelDemo class displays five buttons using a JPanel.
    • The buttonPanel is created and its layout is set to GridLayout with 1 row and the number of buttons as columns.
    • The program creates and adds buttons to the buttonPanel.
    • The buttonPanel is added to the container using BorderLayout.SOUTH.

    Layout Managers

    • Layout managers are used to arrange GUI components within a container.
    • setLayout() method is used to specify the layout manager for a container.
    • FlowLayout is the default layout manager for Applet, Panel, and JPanel, placing components sequentially from left to right.

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    Related Documents

    GUI Components Lecture Notes PDF

    Description

    This quiz covers the implementation of the GridLayoutDemo class in Java, which demonstrates the use of the GridLayout for organizing components in a graphical user interface. Additionally, it explores the functionality of panels within Java's Swing framework, specifically highlighting how JPanel helps in organizing components. Test your knowledge on these essential GUI concepts!

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