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Questions and Answers
Which layout manager positions components into five regions: east, west, north, south, and center?
Which layout manager positions components into five regions: east, west, north, south, and center?
- GridLayout
- FlowLayout
- BorderLayout (correct)
- CardLayout
Which class is an AWT event listener interface used to handle component events?
Which class is an AWT event listener interface used to handle component events?
- FocusEvent
- ContainerEvent
- ActionListener (correct)
- WindowEvent
In Java, which package contains the classes and interfaces for event handling?
In Java, which package contains the classes and interfaces for event handling?
- java.awt.event (correct)
- java.io
- java.awt
- java.util
What is the main purpose of Java applets?
What is the main purpose of Java applets?
Which of the following correctly describes a checkbox in AWT?
Which of the following correctly describes a checkbox in AWT?
Which layout manager allows components to be arranged in a deck of cards, showing only one at a time?
Which layout manager allows components to be arranged in a deck of cards, showing only one at a time?
Which of the following is NOT a type of event class in AWT?
Which of the following is NOT a type of event class in AWT?
What does the class Container in AWT do?
What does the class Container in AWT do?
What does AWT stand for?
What does AWT stand for?
Which class is the immediate super class of Applet?
Which class is the immediate super class of Applet?
Which method is used to set the size of a frame in AWT?
Which method is used to set the size of a frame in AWT?
What is the primary purpose of the Canvas class in AWT?
What is the primary purpose of the Canvas class in AWT?
Which layout manager arranges components in a grid format?
Which layout manager arranges components in a grid format?
Which of the following methods is used to remove all controls from an applet?
Which of the following methods is used to remove all controls from an applet?
Which style is not supported by the Font class in AWT?
Which style is not supported by the Font class in AWT?
What is the purpose of the Panel class in AWT?
What is the purpose of the Panel class in AWT?
Which class directly represents the basic building blocks of a graphical user interface in AWT?
Which class directly represents the basic building blocks of a graphical user interface in AWT?
How can you create radio buttons in AWT?
How can you create radio buttons in AWT?
Which option correctly identifies subclasses of the Window class in AWT?
Which option correctly identifies subclasses of the Window class in AWT?
Which method is used to add items to a choice control in AWT?
Which method is used to add items to a choice control in AWT?
Which of the following components creates a dropdown list of options?
Which of the following components creates a dropdown list of options?
What defines the structure of the CardLayout class constructors?
What defines the structure of the CardLayout class constructors?
What is the primary function of a menu bar in an AWT application?
What is the primary function of a menu bar in an AWT application?
What does the Component class being an abstract class imply?
What does the Component class being an abstract class imply?
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Study Notes
General AWT Concepts
- AWT stands for Abstract Window Toolkit, which is a set of APIs used in Java for creating GUI applications.
- Events in Java represent changes in state within a source, typically user actions or system-generated events.
- Java applets facilitate the development of graphical user interactive applications that run within a web browser.
Event Handling in AWT
- Event classes include ActionEvent, ComponentEvent, ItemEvent, KeyEvent, WindowListener, MouseEvent, and TextEvent, collectively handling various user interactions.
- AWT uses the
java.awtpackage for essential classes and interfaces related to event handling.
Layout Managers
- Layout managers control the arrangement of components within a container:
- BorderLayout arranges components in five areas: east, west, north, south, center.
- CardLayout displays components as a stack of cards, showing one at a time.
- FlowLayout arranges components horizontally, wrapping them when necessary.
- GridLayout organizes components in a grid format.
AWT Controls
- AWT controls are subclasses of the Component class and include :
- Label (passive control)
- Button
- Checkbox
- TextField
- To add names to choice controls, use the
addItem()method. - The Color class allows object creation using RGB, RYB, CMY, or HSB color values.
Working with Windows and Panels
- The Window class is utilized for creating windowed applications, while Panel is essential for managing and grouping GUI components.
- An Applet is a subclass of Panel, indicating its role as a GUI component in AWT.
- The
setSize()method defines the dimensions of AWT components and is primarily found in the Component class.
Menus and Menu Items
- A menu bar provides a list of menus located at the top of a top-level window.
- Menus can be classified as pop-up menus or regular menus, the latter being displayed within the menu bar at the top of the application window.
Additional AWT Components
- Checkbox allows interaction via a combination of a small box and a label.
- Radio buttons can be created using the CheckboxGroup class, facilitating the selection of a single option from a set.
- The Dimension class encapsulates variables for height and width.
Method Calls and Visibility
- To hide a window in AWT, the
setVisible()method is used. - The
removeAll()method effectively clears all controls from a panel or applet.
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