Advanced Java Programming - Swing Components

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Questions and Answers

Which package contains the definitions for Swing components?

java.javax.swing

javax.applet.swing

javax.java.swing

javax.swing (correct)

What is the superclass of all swing button components?

ButtonGroup

Button

JButton

AbstractButton (correct)

Which of the following alignments is not supported by JLabel?

CENTER

LEADING

LEFT

TOP (correct)

Alignment constants for JLabel are defined in which interface?

SwingConstants interface Signup and view all the answers

Which method is used to set an icon for a JLabel?

Using setIcon( ) method Signup and view all the answers

Which class encapsulates Swing's text field?

JComponent class Signup and view all the answers

How can you specify the number of columns for a JTextField?

Use setColumns( ) method Signup and view all the answers

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

String Signup and view all the answers

What is the method that allows both text and icon to be set in a JButton?

Initialize them directly in the constructor Signup and view all the answers

Which event type is triggered when a JButton is pressed?

ActionEvent Signup and view all the answers

Which event is generated when a JCheckBox is clicked?

ItemEvent Signup and view all the answers

What class is primarily used to create radio buttons?

JRadioButton class Signup and view all the answers

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

preventDropMenu( ) Signup and view all the answers

Which constant indicates that scroll bars should always be shown?

HORIZONTAL_SCROLLBAR_ALWAYS Signup and view all the answers

Which class defines the scroll bar constants for a scroll pane?

ScrollPaneConstants class Signup and view all the answers

Which method is used to add tabs in a tabbed pane?

addTab( ) Signup and view all the answers

Is it possible to directly add an array of objects to a JTree using its constructor?

Not possible Signup and view all the answers

Which of the following items can’t be directly added to a JTree using its constructor?

Array of objects Signup and view all the answers

Which event is generated when a tree is expanded?

TreeExpansionEvent Signup and view all the answers

What is the immediate subclass of JScrollPane?

ScrollPane Signup and view all the answers

Which method is used to translate a mouse click on a specific point of the tree to a tree path?

getPathForLocation( ) Signup and view all the answers

What type of Java construct is TreeNode?

A class Signup and view all the answers

In which package is the TreeExpansionEvent class defined?

javax.swing.event package Signup and view all the answers

Which method is provided by the TreeExpansionListener interface?

treeExpanded( ) Signup and view all the answers

How can Vector elements be integrated with a JTree?

Pass vector as parameter for JTree Signup and view all the answers

What two parameters are necessary to create a JTree?

Data array and Column Headings Signup and view all the answers

Which method is NOT associated with interacting with a JTree?

addNode( ) Signup and view all the answers

Which of the following is NOT true about the TreeExpansionListener interface?

It must be instantiated directly. Signup and view all the answers

What method would you use to listen for tree node collapses in Swing?

treeCollapsed( ) Signup and view all the answers

Which of the following correctly describes how to update a JTree after model changes?

Use the reload( ) method of the tree model. Signup and view all the answers

Study Notes

Advanced Java Programming - The Tour of Swing

Swing Components Package: Swing components are defined in the javax.swing package.
Swing Button Superclass: The superclass for all Swing buttons is AbstractButton.
JLabel Alignment: JLabel supports TOP, LEFT, and CENTER alignment. LEADING alignment is not possible.
JLabel Alignment Constants: Swing alignment constants are part of the SwingConstants interface.
JLabel Icon: Use the setIcon() method to add an icon to a JLabel.
Swing Text Field: Swing's text field (JTextField) is encapsulated by the JTextComponent class.
JTextField Columns: Set the number of columns for a JTextField using the setColumns() method.
JButton getText(): The getText() method of a JButton returns a String.
JButton Icon and Text: Use the setIcon() and setText() methods individually to add an icon and text to a JButton. Don't use a single method for both.
JButton Push Event: A JButton generates an ActionEvent when pushed.
JCheckBox Superclass: JCheckBox's immediate superclass is JComponent.
JCheckBox Constructor: A JCheckBox constructor with a boolean and a String value, like JCheckBox(true, "YES"), sets the checkbox to selected and displays the defined String.
JCheckBox Click Event: Clicking a JCheckBox generates an ItemEvent.
Radio Buttons: Create radio buttons using the ButtonGroup class.
JComboBox Vector: Add all elements to a JComboBox by using the addItem() method directly.
JComboBox Drop-down: Disable the drop-down feature of a JComboBox by setting the drop-down's property to false in the constructor.
JTabbedPane: The addTab() method is used to add tabs in a JTabbedPane.
JScrollPane Scrollbars: Use HORIZONTAL_SCROLLBAR_ALWAYSto display horizontal scrollbars in a JScrollPane regardless of content.
immediate sub class: JComponent is an immediate sub class of JContainer.
Tree Array of Objects: Adding arrays of objects to trees is not possible directly-- use a different approach which is not specified here.
JTree Parameters: A JTree constructor requires a data array and column/row headings to populate the tree.

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Description

Explore the key concepts of Swing components in Java programming. This quiz covers everything from the core javax.swing package to specific components like JLabel and JTextField. Test your understanding of alignment, icons, and methods used within these components.