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

Which class defines the scroll bar constants for scroll panes?

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

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

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

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

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

When a tree is expanded, which event is generated?

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

Which class is an immediate subclass of JScrollPane?

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

In which package are Swing components defined?

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

What is the superclass of all Swing buttons?

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

Which of the following alignments is not possible for JLabel?

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

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

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

How is the icon set for a JLabel?

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

Swing’s text field is encapsulated by which class?

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

How do you specify the number of columns for JTextField?

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

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

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

Which event is generated when a JButton is pushed?

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

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

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

What type of programming construct is TreeNode?

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

In which package is the TreeExpansionEvent class located?

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

Which method is provided by the TreeExpansionListener interface?

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

How can Vector elements be incorporated into a JTree?

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

What two components are essential to initialize a JTree?

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

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

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

Which of these accurately describes a TreeNode?

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

Which package includes classes that handle tree expansion events?

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

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

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

Flashcards

Where are Swing components defined?

The javax.swing package contains all the Swing components, providing a rich set of graphical user interface elements.

What is the superclass of all Swing buttons?

The AbstractButton class serves as the base for all Swing buttons, including JButton, JRadioButton, and JCheckBox.

Which alignment is NOT possible for JLabel?

The JLabel component doesn't support LEADING alignment. It offers TOP, LEFT, CENTER, RIGHT, BOTTOM, and TRAILING alignment options.

Where are JLabel alignment constants defined?

The SwingConstants interface provides constants for various alignment options used in Swing components, including JLabel.

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How do you set an icon for JLabel?

You can set an icon for a JLabel using the setIcon(Icon) method. The Icon interface represents an image that can be displayed in a Swing component.

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What class encapsulates Swing's text field?

The JTextField class represents a single-line text field, which extends the JTextComponent class. This class provides basic text editing capabilities.

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How to set the number of columns for JTextField?

You can control the number of columns in a JTextField using the setColumns(int) method. This determines the width of the text field.

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

The getText() method of the JButton class returns a String representing the text displayed on the button. It does not return a void or a character array.

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How to assign both String and Icon to JButton?

You can assign both a string (text) and an icon to a JButton by setting them directly in the constructor or using methods. There are no specific methods like setTextIcon() or setIconText().

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What event occurs when a JButton is pushed?

An ActionEvent is generated when you push a JButton. It indicates that the button has been clicked and an action should be performed.

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What event is generated when JCheckBox is clicked?

The ItemEvent is generated whenever a JCheckBox is clicked, indicating a change in its state (checked or unchecked).

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How to create Radio buttons?

The JRadioButton class is used to create radio buttons. Radio buttons allow the user to select one option from a group.

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How to make the group of Radio buttons?

You can group radio buttons using the ButtonGroup class. This ensures that only one radio button within the group can be selected at a time.

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How to add the contents of whole vector into the JComboBox?

You can add the contents of a whole vector to a JComboBox using the addItem() method, which adds each element of the Vector as a separate item in the drop-down list of the JComboBox.

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How to prevent the drop-down list of JComboBox?

You can prevent the dropdown list of a JComboBox from appearing by setting the property "editable" to true. This allows the user to directly type input into the JComboBox.

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Which method is used to define the tabs in the tabbed pane?

The addTab() method is used to add a new tab to a tabbed pane. Each tab can contain its own content, creating a structured way to organize and present information.

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Where are the scroll bar constants for scroll pane defined in?

The ScrollPaneConstants class defines constants for scroll bar policies, which determine when scroll bars are displayed or hidden.

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What are the constants for the scroll bar in the scroll plane?

The HORIZONTAL_SCROLLBAR_ALWAYS constant renders a horizontal scroll bar consistently, regardless of the content's size.

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JScrollPane is an immediate sub-class of –

JScrollPane is a direct subclass of JComponent. It provides a scrollable container for other components, allowing you to display content exceeding the available space.

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Is it possible to add an array of objects to trees?

You can add an array of objects to a JTree using its add( ) method. This method operates on the tree's root node or any of its sub-nodes, allowing you to construct the hierarchical structure of the tree.

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Which Swing method translates a mouse click to a tree path?

The getPathForLocation() method is used to convert a mouse click position on a tree to its corresponding path in the tree structure. It effectively translates a specific point on the tree's visual representation into the hierarchical path of nodes leading to that point.

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What is a TreeNode?

The TreeNode is a fundamental building block in Swing's JTree component. It represents an individual node within the tree structure. It can be used to store data and hold references to its child nodes, forming the hierarchical structure of a tree.

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Where is the TreeExpansionEvent class defined?

The TreeExpansionEvent class acts as a messenger, signaling when a node in a JTree is expanded or collapsed. It contains information about the node that was expanded or collapsed, allowing your program to respond accordingly.

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What does the TreeExpansionListener interface provide?

The TreeExpansionListener interface defines methods that are triggered when a node in a JTree is expanded or collapsed. Programs implement this interface to provide custom actions based on these tree expansion events.

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How to add Vector elements to a JTree?

You cannot directly add a Vector of elements to a JTree using a special method. However, you can populate the tree using the DefaultMutableTreeNode class, which can be used with a Vector as its source of data.

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What parameters are needed to create a JTree?

A JTree constructor needs two key components: an array of data to populate the tree and its corresponding row headings (representing each level in the tree). This combination defines the tree's visual structure.

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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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