Java Event Handling Quiz

Questions and Answers

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?

FocusEvent

ContainerEvent

ActionListener (correct)

WindowEvent

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?

To create graphical and user interactive applications Signup and view all the answers

Which of the following correctly describes a checkbox in AWT?

A control with a small box and label Signup and view all the answers

Which layout manager allows components to be arranged in a deck of cards, showing only one at a time?

CardLayout Signup and view all the answers

Which of the following is NOT a type of event class in AWT?

ColorEvent Signup and view all the answers

What does the class Container in AWT do?

Holds various components and other containers Signup and view all the answers

What does AWT stand for?

Abstract Windows Toolkit Signup and view all the answers

Which class is the immediate super class of Applet?

Component Signup and view all the answers

Which method is used to set the size of a frame in AWT?

setSize() Signup and view all the answers

What is the primary purpose of the Canvas class in AWT?

To provide a blank window for drawing. Signup and view all the answers

Which layout manager arranges components in a grid format?

GridLayout Signup and view all the answers

Which of the following methods is used to remove all controls from an applet?

removeAll() Signup and view all the answers

Which style is not supported by the Font class in AWT?

Font.UNDERLINE Signup and view all the answers

What is the purpose of the Panel class in AWT?

To group components Signup and view all the answers

Which class directly represents the basic building blocks of a graphical user interface in AWT?

Component Signup and view all the answers

How can you create radio buttons in AWT?

Using CheckboxGroup class Signup and view all the answers

Which option correctly identifies subclasses of the Window class in AWT?

Both A & B Signup and view all the answers

Which method is used to add items to a choice control in AWT?

addItem() Signup and view all the answers

Which of the following components creates a dropdown list of options?

Choice Signup and view all the answers

What defines the structure of the CardLayout class constructors?

Both A & B Signup and view all the answers

What is the primary function of a menu bar in an AWT application?

Contain a list of menus Signup and view all the answers

What does the Component class being an abstract class imply?

Cannot instantiate directly Signup and view all the answers

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.awt package 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.

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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Description

Test your knowledge on Java event handling with this quiz. Questions cover event types, event classes, and their attributes, designed for students familiar with Java programming. Perfect for reinforcing key concepts in Java development.