Java-1-Ch02-Quiz02

Which package do you need to import to use the Scanner class in Java?

• A. java.util.Scanner

• B. java.io.Scanner

• C. java.net.Scanner

• D. java.lang.Scanner

What is the main purpose of the Scanner class in Java?

• A. To create GUI components.

• B. To read input from various input sources.

• C. To execute SQL queries.

• D. To perform mathematical operations.

Which method of the Scanner class is used to read a string input from the user?

• A. nextString()

• B. next()

• C. readString()

• D. nextLine()

If you want to read an integer input from the user using the Scanner class, which method would you use?

• A. nextInt()

• B. next()

• C. nextInteger()

• D. nextNumber()

What will happen if the user enters a non-numeric value while using nextInt()?

• A. It will return 0.

• B. It will throw a NumberFormatException.

• C. It will throw an InputMismatchException.

• D. It will return null.

How do you create a Scanner object to read from the keyboard?

• A. Scanner scanner = new Scanner(System.in);

• B. Scanner scanner = new Scanner(System.out);

• C. Scanner scanner = new Scanner(System.err);

• D. Scanner scanner = new Scanner(System.console());

Which of the following methods reads a floating-point number from the input?

• A. nextInt()

• B. nextFloat()

• C. nextDouble()

• D. Both B and C

Which package contains the JOptionPane class in Java?

• A. java.awt

• B. javax.swing

• C. java.util

• D. java.io

What is the primary purpose of the JOptionPane class in Java?

• A. To handle file input and output.

• B. To create graphical dialog boxes for user interaction.

• C. To manage network connections.

• D. To implement threading.

Which method would you use to display an information message dialog using JOptionPane?

• A. showInputDialog()

• B. showConfirmDialog()

• C. showMessageDialog()

• D. showOptionDialog()