Java Multithreading, JDBC & GUI MCQs (15 Questions with Answers) | Exam Prep Guide

1. What is a thread in Java?

a) A variable
b) A lightweight process
c) A function
d) A class

2. Which class is used to create a thread in Java?

a) Thread
b) Runnable
c) Both A and B
d) Process

3. Which method is used to start a thread?

a) run()
b) start()
c) execute()
d) init()

4. What is the output of calling run() directly instead of start()?

a) Creates a new thread
b) Runs in the same thread
c) Compilation error
d) Runtime error

5. Which keyword is used for synchronization in Java?

a) sync
b) synchronized
c) lock
d) thread-safe

6. Which package is used for JDBC?

a) java.io
b) java.sql
c) java.util
d) java.net

7. What does JDBC stand for?

a) Java Data Connection
b) Java Database Connectivity
c) Java Dynamic Connection
d) Java Database Controller

8. Which method is used to execute a SQL query in JDBC?

a) executeQuery()
b) runQuery()
c) queryExecute()
d) executeSQL()

9. Which class is used to establish a database connection?

a) Connection
b) DriverManager
c) Statement
d) ResultSet

10. Which database is commonly used with JDBC?

a) Oracle
b) MySQL
c) PostgreSQL
d) All of the above

11. Which method is used to close a database connection?

a) stop()
b) end()
c) close()
d) terminate()

12. Which package is used for Java Swing?

a) java.fx
b) javax.swing
c) java.gui
d) java.awt.swing

13. Which component is used to create a button in Swing?

a) JButton
b) JLabel
c) JTextField
d) JCheckBox

14. Which Java GUI framework is more modern than Swing?

a) AWT
b) JavaFX
c) SWT
d) Applet

15. Which method is used to make a Swing frame visible?

a) show()
b) display()
c) setVisible(true)
d) open()

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