Advanced Java Programming Chapter 1

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Questions and Answers

What is the primary purpose of the Component class?

Laying out other components on the screen

Remembering colors and font settings (correct)

Creating top-level window interfaces

Serving as a passive display element

Which class is responsible for positioning other components within it?

Component

Window

Panel (correct)

Frame

Which class directly represents a window on the desktop?

Dialog

Panel

Frame (correct)

Container

What is the function of the Label component in AWT?

To simply display strings Signup and view all the answers

Which statement accurately describes the relationship between Panel and Applet?

Panel is the immediate superclass of Applet Signup and view all the answers

Which constructor would you use to create a TextArea with a predefined string and specific size?

TextArea(String str, int numLines, int numChars) Signup and view all the answers

What does the method setEditable() do in the context of a TextArea?

Allows the user to modify the content of the TextArea Signup and view all the answers

What is the purpose of using the Scrollbar class in a GUI application?

To navigate through content that exceeds visible space Signup and view all the answers

Which of the following is NOT a type of scrollbar style available in the Scrollbar class?

SCROLLBARS_AUTO Signup and view all the answers

How is a vertical scrollbar instantiated with specific parameters?

Scrollbar(Scrollbar.VERTICAL, 0, 100, 0, height) Signup and view all the answers

What feature distinguishes a CheckboxGroup from regular checkboxes?

CheckboxGroup enables mutually exclusive selections. Signup and view all the answers

What is the purpose of the `getSelectedCheckbox()` method in a CheckboxGroup?

To obtain the currently selected checkbox. Signup and view all the answers

Which method is used to add an item to a Choice object?

add(String name) Signup and view all the answers

When constructing a List with multiple selection enabled, what would be the correct constructor?

List(int numRows, true) Signup and view all the answers

What does the `getSelectedItem()` method do in a Choice object?

Provides the label of the selected item. Signup and view all the answers

What method would you use to set the alignment of a Label in a Java AWT application?

setAlignment(int how) Signup and view all the answers

What is the purpose of the getLabel() method in a Button class?

To return the current label of the button. Signup and view all the answers

Which of the following methods initializes a button in a Java AWT applet?

Button(String str) Signup and view all the answers

When using a Checkbox, which method would you call to check its current state?

getState() Signup and view all the answers

What does the setText(String str) method do in a Label class?

It changes the text of the label to the specified string. Signup and view all the answers

Which label is created to display text aligned to the left in a Java AWT application?

Label.LEFT Signup and view all the answers

In the Buttonapplet example, how is the button labeled 'No' created?

Button b2 = new Button('No'); Signup and view all the answers

What does the Checkbox constructor Checkbox(String str, Boolean on) do?

It creates a checkbox with a specified label and checked state. Signup and view all the answers

What does the AWT class hierarchy's topmost class represent?

Component Signup and view all the answers

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

setVisible(boolean visibleFlag) Signup and view all the answers

Which AWT component can be used to create a graphical user interface programmatically?

Button Signup and view all the answers

What is a primary characteristic of AWT components?

They are platform-dependent and vary by operating system. Signup and view all the answers

Which method is responsible for setting the size of a frame in AWT?

setSize(int newWidth, int newHeight) Signup and view all the answers

Which statement about AWT is true?

AWT components use more resources than Swing components. Signup and view all the answers

How would you implement a simple applet that changes background color to yellow?

setBackground(Color.YELLOW); Signup and view all the answers

Which statement distinguishes a Java application window from an applet?

Java applications run in a standalone environment. Signup and view all the answers

Which method is used to add an item at a specific index in a List?

void add(String name, int index) Signup and view all the answers

What does the method getSelectedItem() return?

The name of the selected item as a String Signup and view all the answers

Which method retrieves the total number of items in a List?

Int getItemCount() Signup and view all the answers

What is the correct way to set a character to echo in a TextField?

t2.setEchoChar('*') Signup and view all the answers

What type of selection does the boolean parameter in the List class constructor enable?

Multiple selection Signup and view all the answers

Which method is used to retrieve a specific item from a List by its index?

String getItem(int index) Signup and view all the answers

What method is used to check if a TextField is editable?

boolean isEditable() Signup and view all the answers

Which statement is correct regarding the TextField and TextComponent classes?

TextField is a subclass of TextComponent. Signup and view all the answers

Study Notes

Advanced Java Programming (22517)

Course syllabus outlines chapter topics and corresponding marks:
- Chapter 1: Introduction to Abstract Windowing Toolkit (AWT) (12 marks)
- Chapter 2: Swing (10 marks)
- Chapter 3: Event Handling (12 marks)
- Chapter 4: Networking (10 marks)
- Chapter 5: Interacting with Database (12 marks)
- Chapter 6: Servlet (14 marks)
- Total marks: 70

Unit 1: Introduction to Abstract Windowing Toolkit (AWT) (12 Marks)

Unit Outcomes:
- Develop graphical user interfaces (GUIs) using AWT.
- Create frame windows using different AWT components.
- Arrange GUI components using layout managers.
- Develop programs using menus and dialog boxes.

AWT (Abstract Window Toolkit)

A platform-dependent application programming interface (API) for creating graphical user interfaces (GUIs) in Java.
AWT classes and methods enable window creation and management.
Components are platform-dependent (displayed according to the operating system).
Components are heavyweight; they consume system resources.
Components:
- TextField
- Button
- Label
- Checkbox
- Choice
- List
- CheckboxGroup

AWT Class Hierarchy

Hierarchical structure of AWT components.
Object is the root of the hierarchy.
Component is the top-level container class.
Container manages child components' layout.
Panel, Window, Frame, Dialog, and Applet are container types.
Button, Label, TextField, Checkbox, Choice, List, CheckboxGroup are components.

Frame

A top-level window with a title bar, menu bar, borders, and resizing corners.
A subclass of Window.

AWT Controls

Components enabling interaction with the application.
- Labels
- Buttons
- Checkboxes
- Checkbox groups
- Scrollbars
- Text fields
- Text areas

AWT Control: Label

Displays text on a window.
Passive component (does not directly receive user input).
Different justification options (left, right, center).

setText(String str): Sets the label's text.
getText(): Retrieves the label's text.
setAlignment(int how): Sets alignment of the text (left, right, center).
getAlignment(): Retrieves the label alignment.

Creating Frame Windows

Use a Frame class or subclass.
Set size, title, and background color.
setSize(int width, int height): Sets the size of the window.
setTitle(String title): Sets the title of the window.
setBackground(Color color): Sets the background color.

Creating Applet Using Frame Window

Create a class that extends the Frame class.
Use the SimpleFrame example code.
The class SimpleFrame extends Frame.
The constructor sets window characteristics and makes it visible.
setVisible(true) makes the frame visual.

Java Application vs Applet

Java Application:
- Has a main method.
- Does not require an internet connection.
- Is a standalone application.
Applet:
- Does not have a main method.
- Requires an internet connection to execute.
- Is part of a web page.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your understanding of the Abstract Windowing Toolkit (AWT) as you learn to create graphical user interfaces (GUIs) in Java. This quiz covers key concepts such as frame windows, layout managers, and menu creation. Perfect for assessing your skills in Java's GUI development.

Advanced Java Programming Chapter 1 - AWT

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Podcast

Questions and Answers

What is the primary purpose of the Component class?

Which class is responsible for positioning other components within it?

Which class directly represents a window on the desktop?

What is the function of the Label component in AWT?

Which statement accurately describes the relationship between Panel and Applet?

Which constructor would you use to create a TextArea with a predefined string and specific size?

What does the method setEditable() do in the context of a TextArea?

What is the purpose of using the Scrollbar class in a GUI application?

Which of the following is NOT a type of scrollbar style available in the Scrollbar class?

How is a vertical scrollbar instantiated with specific parameters?

What feature distinguishes a CheckboxGroup from regular checkboxes?

What is the purpose of the getSelectedCheckbox() method in a CheckboxGroup?

Which method is used to add an item to a Choice object?

When constructing a List with multiple selection enabled, what would be the correct constructor?

What does the getSelectedItem() method do in a Choice object?

What method would you use to set the alignment of a Label in a Java AWT application?

What is the purpose of the getLabel() method in a Button class?

Which of the following methods initializes a button in a Java AWT applet?

When using a Checkbox, which method would you call to check its current state?

What does the setText(String str) method do in a Label class?

Which label is created to display text aligned to the left in a Java AWT application?

In the Buttonapplet example, how is the button labeled 'No' created?

What does the Checkbox constructor Checkbox(String str, Boolean on) do?

What does the AWT class hierarchy's topmost class represent?

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

Which AWT component can be used to create a graphical user interface programmatically?

What is a primary characteristic of AWT components?

Which method is responsible for setting the size of a frame in AWT?

Which statement about AWT is true?

How would you implement a simple applet that changes background color to yellow?

Which statement distinguishes a Java application window from an applet?

Which method is used to add an item at a specific index in a List?

What does the method getSelectedItem() return?

Which method retrieves the total number of items in a List?

What is the correct way to set a character to echo in a TextField?

What type of selection does the boolean parameter in the List class constructor enable?

Which method is used to retrieve a specific item from a List by its index?

What method is used to check if a TextField is editable?

Which statement is correct regarding the TextField and TextComponent classes?

Study Notes

Advanced Java Programming (22517)

Unit 1: Introduction to Abstract Windowing Toolkit (AWT) (12 Marks)

AWT (Abstract Window Toolkit)

AWT Class Hierarchy

Frame

AWT Controls

AWT Control: Label

Methods Related To Text

Creating Frame Windows

Creating Applet Using Frame Window

Java Application vs Applet

Studying That Suits You

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