Java Swing Components Quiz
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Questions and Answers

Which event is generated when a JCheckBox is clicked?

  • TextEvent
  • ActionEvent
  • MouseEvent
  • ItemEvent (correct)

    • Which class is used to create a group of Radio buttons?

  • JButton class
  • ButtonGroup class (correct)
  • JCheckboxGroup class
  • JRadioButton class

    • What method is used to define the tabs in a tabbed pane?

  • addItem( )
  • addTab( ) (correct)
  • add( )
  • addPane( )

    • Which constant ensures that scroll bars are always visible in a JScrollPane?

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

    What method is used to transfer the contents of a whole vector into a JComboBox?

    <p>Use the constructor of JComboBox</p> Signup and view all the answers

    Which class defines the scroll bar constants for scroll panes?

    <p>ScrollPaneConstants class</p> Signup and view all the answers

    Which method prevents the drop-down list of a JComboBox?

    <p>It is not possible</p> Signup and view all the answers

    Which items cannot be directly added to a JTree using its constructor?

    <p>Array of objects</p> Signup and view all the answers

    When a tree is expanded, which event is generated?

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

    Which class is an immediate subclass of JScrollPane?

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

    In which package are Swing components defined?

    <p>javax.swing</p> Signup and view all the answers

    What is the superclass of all Swing buttons?

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

    Which of the following alignments is not possible for JLabel?

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

    Alignment constants of JLabel are part of which interface or class?

    <p>SwingConstants interface</p> Signup and view all the answers

    How is the icon set for a JLabel?

    <p>Using setIcon( ) method</p> Signup and view all the answers

    Swing’s text field is encapsulated by which class?

    <p>JTextComponent class</p> Signup and view all the answers

    How do you specify the number of columns for JTextField?

    <p>Use setColumns( ) method</p> Signup and view all the answers

    What is the return type of the getText( ) method of JButton class?

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

    How can a string and icon be assigned to a JButton?

    <p>Initialize them directly in the constructor</p> Signup and view all the answers

    Which event is generated when a JButton is pushed?

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

    Which method is specifically designed to convert a mouse click into a tree path?

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

    What type of programming construct is TreeNode?

    <p>A class</p> Signup and view all the answers

    In which package is the TreeExpansionEvent class located?

    <p>javax.swing.event package</p> Signup and view all the answers

    Which method is provided by the TreeExpansionListener interface?

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

    How can Vector elements be incorporated into a JTree?

    <p>Pass vector as parameter for JTree</p> Signup and view all the answers

    What two components are essential to initialize a JTree?

    <p>Data array and Column Headings</p> Signup and view all the answers

    Which method would you NOT expect to find in the TreeExpansionListener interface?

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

    Which of these accurately describes a TreeNode?

    <p>Holds the tree structure data</p> Signup and view all the answers

    Which package includes classes that handle tree expansion events?

    <p>javax.swing.event package</p> Signup and view all the answers

    Which of the following classes is NOT part of Swing's tree management?

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

    Study Notes

    Swing Components

    • Swing components are defined in the javax.swing package.
    • The superclass of all Swing buttons is AbstractButton.

    JLabel Alignment

    • JLabel alignment options include TOP, LEFT, and CENTER.
    • LEADING alignment is not possible for JLabel.
    • Alignment constants are part of the SwingConstants interface.

    Setting Icons for JLabel

    • To set an icon for a JLabel, use the setIcon() method.
    • The Icon class can be used directly.
    • You cannot use the makeIcon() method to set an icon.

    Swing Text Field Encapsulation

    • Swing's text field (JTextField) is encapsulated by the JTextComponent class.

    JButton Action Event

    • Pushing a JButton generates an ActionEvent.

    JCheckBox Superclass

    • The immediate superclass of JCheckBox is JComponent.

    JTextField Column Configuration

    • To specify the number of columns in a JTextField, use the setColumns() method.
    • You can directly set the value in the constructor.

    JButton getText() Return Type

    • The getText() method of a JButton returns a String.

    JButton Icon and Text

    • Use setIcon() and setText() methods to set the icon and text for a JButton.
    • Initializing the icon and text directly in the constructor is also possible.

    JComboBox Adding Items

    • To add items to a JComboBox, use the addItem() method.
    • A Vector of items can be added to a JComboBox using the constructor.

    Preventing JComboBox Drop-Down

    • To prevent the drop-down list in a JComboBox, use the constructor with the false argument inside and the preventDropMenu() method.

    Tabbed Pane Tab Definition

    • To define tabs in a TabbedPane, use the addTab() method.

    Scroll Pane Scroll Bar Constants

    • Scroll bar constants for a JScrollPane are defined in the ScrollPaneConstants class.

    Scroll Bar Visibility

    • The constant HORIZONTAL_SCROLLBAR_ALWAYS will always display horizontal scrollbars.

    JScrollPane Subclass

    • JScrollPane is a subclass of JComponent.

    Adding Arrays to JTree

    • It is not possible to directly add arrays of objects to a JTree.
    • You can use one of the constructor's forms.

    JTree Parameters

    • The JTree constructor requires a Vector and Row Headings to create a JTree.

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    Description

    Test your knowledge on Java Swing components, including JLabel, JButton, and JTextField. This quiz covers alignment options, icon settings, and action events related to different Swing classes. Perfect for anyone learning Java GUI programming!

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