What is the purpose of the setEnabled() method for a Java Swing component?

To enable or disable the component

To set the size of the component

To set the background color of the component

To set the text of the component

What is the primary purpose of a JCheckBox component?

To allow the user to select one or more options from a list of independent choices

To allow the user to select a single option from a list

To display a single line of text

What is the purpose of the addItemListener() method for a JCheckBox?

To listen for changes in the selection state

What is the primary purpose of event handling in Java Swing?

To respond to user interactions and other events

To draw components on the screen

To manage the layout of components

To handle data storage and retrieval

What is the primary purpose of a JPopupMenu?

To display a context menu that appears when the user right-clicks (or context-clicks).

To display a menu bar at the top of a window.

To display a menu that appears when a button is clicked.

To display a list of selectable items.

Can you set the font of the text in a JLabel?

Yes, using the setFont() method

Yes, but only if you create a custom subclass of JLabel.

Yes, using the setTextFont() method.

What is the role of the Java Virtual Machine (JVM) in running a Swing application?

It interprets the Java bytecode and executes the application.

No, the font is fixed It compiles the Java code into machine code.

It manages the graphical user interface (GUI).

It handles network communication. .

What happens when you call setEnabled(false) on a radio button?

The radio button becomes unselectable (grayed out).

The radio button becomes invisible

The radio button's background color changes

The radio button's text disappears.

A Swing application displays the result of a calculation in a JLabel. The result is an integer. What's the correct way to display this integer in the JLabel?

myLabel.setText(String.valueOf(myInteger));

myLabel.setText(myInteger.toString()); (Incorrect for a primitive int)

myLabel.setText(Integer.toString(myInteger));

What happens if you call setText(null) on a JTextField?

The text field is cleared (becomes empty).

The text field becomes invisible.

Assume myArea is a JTextArea. What does myArea.getText().length() return?

The number of characters in myArea

The number of paragraphs in myArea.

In a Swing application, you have a button that should clear a JTextField and then exit the application. Which code snippet is most appropriate for the button's ActionListener?

myTextField.setText(""); System.exit(0);

myTextField.empty(); System.exit(1);

myTextField.setText(""); this.close(); (Only if called from a top-level container

myTextField.clear(); System.close();

You have two JTextField components, num1Field and num2Field, where the user enters numbers. Which code snippet correctly retrieves these numbers as integers?

int num1 = Integer.parseInt(num1Field.getText()); int num2 = Integer.parseInt(num2Field.getText());

int num1 = num1Field.getText(); int num2 = num2Field.getText();

int num1 = num1Field; int num2 = num2Field;

int num1 = Integer.valueOf(num1Field); int num2 = Integer.valueOf(num2Field);

You want to display the result of a calculation (a double) in a JLabel formatted to two decimal places. What's the best approach?

Both a) and b) are good approaches.

Use String.format() to format the double before setting the text in the JLabel.

Use DecimalFormat to format the double before setting the text in the JLabel.

Let the JLabel automatically handle formatting.

Which code snippet correctly formats a double variable myDouble to two decimal places using String.format()?

String formatted = String.format("%.2f", myDouble);

String formatted = String.format("%f", myDouble);

String formatted = String.format("%2f", myDouble;

String formatted = String.format("&.2f", myDouble);

What is the primary purpose of a try-catch block in a Java Swing application?

To handle potential runtime errors and prevent application crashes.

To improve the performance of the application.

To manage the layout of components in a window.

To create custom event listeners.

Which part of the Java Development Kit (JDK) contains the necessary classes for Swing?

The Java Swing API (part of the core Java libraries)

The Java Database Connectivity (JDBC) API s)

Summative Test in CP(Java)

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1. Which of the following is NOT a top-level container in Java Swing?

JFrame

JDialog

JPanel

JWindow

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2. What is the primary purpose of a LayoutManager in Swing?

To handle events

To manage the size and position of components

To paint components

To handle data input

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which class is used to create a simple button in Swing?

JTextfield

JButton

JLabel

JCheckBox

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which component is best suited for displaying a list of selectable items?

JComboBox

JTree

JList

JProgressBar

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which component provides a scrollable view of a large component?

JWindow

JDialog

JScrollPane

JPanel

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of these is used to create a menu bar in a Swing application?

JMenuBar

JMenu

JMenuItem

JPopupMenu

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which component is best for displaying a single line of non-editable text?

JTextField

JTextArea

JLabel

JPasswordField

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Summative Test in CP(Java)

1. Which of the following is NOT a top-level container in Java Swing?

2. What is the primary purpose of a LayoutManager in Swing?

Which class is used to create a simple button in Swing?

Which component is best suited for displaying a list of selectable items?

Which component provides a scrollable view of a large component?

Which of these is used to create a menu bar in a Swing application?

Which component is best for displaying a single line of non-editable text?

The following are the JSwing Containers EXCEPT:

These are the events which occur when the user interacts with UI elements.

What is the purpose of the setEnabled() method for a Java Swing component?

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