Java Applet Programming Quiz

Questions and Answers

What does AWT stand for?

All windows Tools

Abstract Window Toolkit (correct)

All Window Toolkit

All writing Tools

Which event is generated when a button is pressed?

FocusEvent

KeyEvent

ActionEvent (correct)

WindowEvent

Which method is used to change the location of an event?

isPopupTrigger()

getClickCount()

getPoint()

translatePoint() (correct)

What is the return type of actionPerformed(ActionEvent e)?

void Signup and view all the answers

What types of dialog boxes are there?

Modal & Modeless Signup and view all the answers

Which method can be used on any instance of java.awt.Component?

SetForeground Signup and view all the answers

Which class serves as the superclass of all events in Java?

EventObject Signup and view all the answers

What is the default layout manager for a Panel or Applet?

Flow Layout Signup and view all the answers

Which method will be called when a character is typed in an input component?

KeyTyped() Signup and view all the answers

What is the correct way to set a label's text in Java using jlbl variable?

jlbl.setText("Result") Signup and view all the answers

Which package is required to use Swing components?

javax.Swing Signup and view all the answers

Which of the following constructors is used to create a JButton with a label?

JButton(String str) Signup and view all the answers

What type of component can be styled with their own look and feel in Java?

Swing Signup and view all the answers

Which object is required to group Checkboxes to ensure only one can be selected at a time?

CheckboxGroup Signup and view all the answers

What class represents a Checkbox with a textual label in a menu?

CheckBoxMenuItem Signup and view all the answers

Which layout is the default for both JPanel and Applet?

FlowLayout Signup and view all the answers

Which method cannot be called on a JLabel object?

setBorderLayout() Signup and view all the answers

Which pane can be utilized to add components to a container?

ContentPane Signup and view all the answers

What is the primary purpose of a JTable?

Displays both rows and columns of data Signup and view all the answers

Which of the following is a valid AWT control?

Push Buttons Signup and view all the answers

Which of the following classes is used for GUI components in Java?

Panel Signup and view all the answers

What is the default layout for JFrame?

BorderLayout Signup and view all the answers

Which class components can display icons in addition to strings?

JTree Signup and view all the answers

Which layout is used to arrange components in a rectangular area?

BorderLayout Signup and view all the answers

What is the return type of the getSelectedItem method in the choice class?

void Signup and view all the answers

Which method triggers adjustmentValueChanged in AdjustmentListener interface?

adjustmentValueChanged() Signup and view all the answers

What is the return type of the getRed() method?

Color Signup and view all the answers

Which listener interface does the Button class implement?

ActionListener Signup and view all the answers

What is the return type of the getItemCount() method?

int Signup and view all the answers

Which class uses the constants BLOCK_DECREMENT and BLOCK_INCREMENT?

Scrollbar Signup and view all the answers

What is the default layout for Applet?

FlowLayout Signup and view all the answers

Which interface does JToggleButton implement?

AbstractButton Signup and view all the answers

Which method is used to obtain a reference to the JCheckBox object that generated the event?

getSelectedItem() Signup and view all the answers

In Swing, a Radio Button is created using which component?

ButtonGroup Signup and view all the answers

What does the following line of code do? 'TextField t=new TextField(10);'

Creates an object that can hold 10 columns of text Signup and view all the answers

The setBackground() method() is a part of which class in the java.awt package?

Container Signup and view all the answers

Which method can be used to remove a java.awt.Component object from display?

remove() Signup and view all the answers

What are controls or components in a user interface?

Components allow users to interact with application Signup and view all the answers

Which of the following can be considered subclasses of Swing components?

Jpanel Signup and view all the answers

Study Notes

Applet Output Methods

Use drawString() method to output a string in an applet.

AWT Overview

AWT stands for Abstract Window Toolkit.

User Interaction Events

ActionEvent is generated when a button is pressed.

JDK Structure

AWT Viewer tool is found in the bin folder of JDK.

Event Handling

setAlignment() returns type void.
Use translatePoint() method to change the location of an event.
actionPerformed(ActionEvent e) returns type void.
itemStateChanged(ItemEvent ie) returns type int.

Dialog Boxes

Types of dialog boxes include Model & Modeless.

Font and Style

Use Font.BOLD + Font.ITALIC to specify a font styled as both bold and italic.

Component Methods

Use setForeground, setBackground, and setFont methods on java.awt.Component instances.
TextField can be used to enter or display a string.
Use jlbl.setText("Result") method to assign the name 'Result' to jlbl.

Key Press Methods

KeyTyped() method is invoked if a character is entered.

Event Classes Hierarchy

Applet is the super class of all adapter classes.
ComponentEvent is the super class of all ContainerEvent classes.
EventObject serves as the super class of all events.

Swing Components

Swing allows components to have their own look and feel.
To create a button with a label, use JButton(String str) constructor.
Use javax.swing package to utilize Swing components.

Layout Managers

Default layout manager for Panel or Applet is FlowLayout.
BorderLayout is the default layout manager for Frame and JFrame.
GridLayout is utilized for arranging components in a 3-dimensional array.

Color Methods

getRed(), getGreen(), and getBlue() return type Color.

Button and CheckBox Interfaces

Button class implements ActionListener.
CheckBox class implements ItemListener.
ScrollBar implements AdjustmentListener.

Action Events and Listeners

ActionEvent belongs to Button class.
addTab() method belongs to JTabbedPane.
getPath() returns type TreePath.

Tree Nodes and Interfaces

DefaultMutableTreeNode implements MutableTreeNode.
getIcon() method return type is Icon.

Radio Buttons and Check Boxes

ButtonGroup is used to create radio buttons.
Exclusive checkboxes require CheckboxGroup.

Control Classes

Various AWT controls include Labels, Push buttons, Checkboxes, and Choice lists.

JPanel and Default Layouts

JPanel and Applet use FlowLayout as their default layout.

JTable Usage

JTable object displays rows and columns of data.

JLabel Restrictions

setBordeLayout() cannot be called on a JLabel object.

Content Pane

ContentPane can be used to add components to a container.

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Description

Test your knowledge on Java applet programming concepts with this quiz. It covers various methods, events, and frameworks related to applets and AWT. Challenge yourself and see how well you understand the fundamentals of Java applet development.