Questions and Answers
What does the JButton constructor JButton(String s) do?
Which of the following classes does JButton extend?
Which method is used to set the visibility of a component in Swing?
How can a frame be created through inheritance in Java Swing?
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Which of the following methods is not a commonly used method of the Component class?
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Which layout management method is primarily used in Swing for arranging components?
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What is the default visibility state of a component in Java Swing?
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When creating a JButton without text or icon, which constructor is used?
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What is the primary purpose of the JButton class in Java Swing?
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Which of the following is NOT a typical use of the JLabel class in Java Swing?
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How can JTextField be used in a Java Swing application?
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What interface must be implemented to handle button click events in Java Swing?
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Which layout manager organizes components in a top-to-bottom manner in Java Swing?
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Which of the following Swing components is known to be lightweight?
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Which statement is true about ActionListener in Java Swing?
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What is the primary difference in component weight between Java AWT and Swing?
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What does the method getText()
return in a JLabel?
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Which constructor for JTextField initializes the field with specific text and a number of columns?
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What does the setHorizontalAlignment(int alignment)
method do?
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What is the purpose of the JTextField class?
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If you want to create an empty JTextField with 10 columns, which constructor would you use?
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Which method would you use to obtain the icon currently displayed by a JLabel?
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What does the int getHorizontalAlignment()
method return in a JLabel?
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Which of the following methods is not associated with JLabel?
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Study Notes
Overview of Java Swing
- Java Swing is part of Java Foundation Classes (JFC) for creating window-based applications.
- Built on top of AWT (Abstract Windowing Toolkit) and fully written in Java.
- Offers platform-independent and lightweight components.
- Key classes in javax.swing package include JButton, JTextField, JTextArea, JRadioButton, JCheckbox, JMenu, and JColorChooser.
Difference between AWT and Swing
- AWT components are platform-dependent; Swing components are platform-independent.
- AWT components are heavyweight, while Swing components are lightweight.
- AWT lacks pluggable look and feel; Swing supports pluggable look and feel.
- Swing offers more extensive and advanced components like tables, lists, scroll panes, color choosers, and tabbed panes compared to AWT.
- Swing adheres to the MVC (Model-View-Controller) architecture; AWT does not.
Java Foundation Classes (JFC)
- JFC consists of a set of GUI components that simplify desktop application development.
Swing Class Hierarchy
- The javax.swing package contains a hierarchy of classes designed for creating GUI applications.
Commonly Used Methods of Component Class
-
add(Component c)
: Adds a component to another component. -
setSize(int width, int height)
: Sets the size of the component. -
setLayout(LayoutManager m)
: Assigns a layout manager to the component. -
setVisible(boolean b)
: Sets component visibility; default is false.
Frame Creation in Swing
- A frame can be created through association by creating an object of the Frame class or through inheritance by extending the Frame class.
- Swing code can be written within main(), constructors, or other methods.
JButton Class Overview
- Declared as
public class JButton extends AbstractButton implements Accessible
. - Constructors:
-
JButton()
: Creates a button with no text and icon. -
JButton(String s)
: Creates a button with specified text. -
JButton(Icon i)
: Creates a button with a specified icon.
-
- Common Methods:
-
getText()
: Returns the text string displayed by the button. -
setText(String text)
: Sets the text displayed by the button. -
setHorizontalAlignment(int alignment)
: Aligns the button's contents on the X axis. -
getIcon()
: Returns the graphic image displayed by the button. -
getHorizontalAlignment()
: Returns the alignment of the button's contents.
-
JTextField Class Overview
- A JTextField is a text component that allows single-line text editing, inheriting from JTextComponent.
- Declared as
public class JTextField extends JTextComponent implements SwingConstants
. - Constructors:
-
JTextField()
: Creates a new JTextField. -
JTextField(String text)
: Initializes a JTextField with specified text. -
JTextField(String text, int columns)
: Initializes with specified text and column count. -
JTextField(int columns)
: Creates an empty JTextField with a set number of columns.
-
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Description
Explore the fundamentals of Java Swing, a part of the Java Foundation Classes (JFC) designed for creating window-based applications. Learn about its lightweight components and how it differs from AWT, as well as the key classes included in the javax.swing package, like JButton and JTextField.