Podcast
Questions and Answers
Which package needs to be imported when writing the JRadioButton class?
Which package needs to be imported when writing the JRadioButton class?
Which method is used to set the visibility of a frame?
Which method is used to set the visibility of a frame?
Which abstract class is the superclass of all menu-related classes?
Which abstract class is the superclass of all menu-related classes?
Which of the following is not an AWT class?
Which of the following is not an AWT class?
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Which are the subclasses of the container class?
Which are the subclasses of the container class?
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Which are the alignment constants of a Label?
Which are the alignment constants of a Label?
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Which AWT component is not editable?
Which AWT component is not editable?
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Which AWT control is used for multi-line text entry?
Which AWT control is used for multi-line text entry?
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Which class can be used to represent a checkbox with a textual label that can appear in a menu?
Which class can be used to represent a checkbox with a textual label that can appear in a menu?
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Which class creates a node in JTree?
Which class creates a node in JTree?
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Which class defines the setSize() method?
Which class defines the setSize() method?
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Which class encapsulates a blank window upon which we can draw?
Which class encapsulates a blank window upon which we can draw?
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Which class is on the top of the AWT event hierarchy?
Which class is on the top of the AWT event hierarchy?
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Study Notes
Frame Visibility
- Use
setVisible(true)to show a frame in Swing. - Other options like
showFrame(),frameVisible(), andsetVisibility()are not valid methods.
JRadioButton Import
- Import
javax.swing.*to use theJRadioButtonclass. - Alternatives like
java.awt.*,java.swing.*, andjavax.awt.*are incorrect.
Menu-Related Classes
-
MenuComponentis the abstract superclass for all AWT menu-related classes. - Other options such as
MenuItem,Menu, andMenuBarare specific implementations.
AWT Components
-
RadioButtonis not an AWT class; it is a Swing component. - Valid AWT classes include
Button,CheckBox, andTextField.
Label Alignment Constants
- Alignment constants for a Label in AWT are
LEFT,CENTER, andRIGHT. - Other listed options do not correspond to label alignment.
Container Class Subclasses
- Subclasses of the Container class include
Window,Panel, andScrollPane. -
JFrame,JPanel, andJScrollPaneare Swing classes, not direct subclasses of AWT's Container.
Non-Editable AWT Component
-
Labelis a non-editable AWT component, solely for display. -
TextField,TextArea, andChoiceare interactive and editable components.
Multi-Line Text Entry
-
TextAreais used for multi-line text input. -
TextFieldis for single-line input, whileLabelandListserve different functions.
Checkbox in Menu
-
CheckBoxMenuItemrepresents a checkbox with a textual label in a menu. -
JCheckBox,Checkbox, andJCheckBoxMenuItemare less suitable for menus.
JTree Node Creation
- Use
DefaultMutableTreeNodeto create nodes within aJTree. - Other options like
TreeNodeandMutableTreeNodeserve different roles in the tree structure.
setSize() Method
- The
setSize()method is defined inComponentand inherited byFrame. - While technically accurate for
Component,Frameis a more recognized class to reference.
Drawing on Canvas
-
Canvasprovides a blank window specifically for drawing graphics. - While
PanelandJPanelare used for layout, they are not focused on graphics.
AWT Event Hierarchy
-
AWTEventis the top class in the AWT event hierarchy. - Other classes like
Event,ComponentEvent, andActionEventare subclasses or specialized events.
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Description
Test your knowledge on Java Swing with this quiz that covers visibility methods and essential packages. Perfect for beginners looking to solidify their understanding of the Swing framework. Answer questions related to frame visibility and other key concepts!
