30 Java Certification Questions You Must Know | Java & JavaScript Exam Prep Guide
“Can you answer these 30 Java certification questions? Let’s see if you’re ready to ace your exam and master both Java & JavaScript!”
Get exam-ready with these 30 Java Certification Questions designed to help you pass your certification on the first try! 🚀
Whether you’re preparing for Java SE, Oracle Certified Professional, or simply improving your coding fundamentals, this video covers all key concepts — from OOP principles to exception handling, collections, and even JavaScript basics for developers working across both ecosystems.
📚 What You’ll Learn:
• Top 30 Java Certification Questions with explanations
• Key differences between Java and JavaScript
• Must-know topics for certification success
• Expert tips for faster problem-solving
Perfect for students, developers, and professionals looking to strengthen their Java and JavaScript knowledge.
👉 Watch till the end and test how many questions you can answer correctly!
💬 Comment your score below and share with your coding friends.
⏱️ Timestamps:
00:00 30 Java Certification Questions
00:13 1. Which of these is not a feature of Java?
00:43 2. Which component of Java is responsible for running the compiled Java bytecode?
01:16 3. What is the purpose of the PATH environment variable in Java?
01:54 4. Which feature of Java makes it possible to run a Java program on different platforms?
02:26 5. In Java, how should class names be written?
02:57 6. How do you comment on a block of code in Java?
03:29 7. What is multithreaded programming?
04:09 8. What is the default value of a boolean variable in Java?
04:38 9. What is the result of this operation in Java? (int)(7.9)
05:12 10. Which keyword is used to define a constant variable in Java?
05:44 11. What is the range of the short data type in Java?
06:39 12. What will be the output of the following code?
07:17 13. What is the output of the following code?
07:50 14. Which one of the following is true for Java?
08:28 15. Which control structure is used to execute a block of code multiple times?
09:00 16. In a 'switch-case' statement, what is the role of the 'break' keyword?
09:35 17. Which keyword is used to prevent a class from being subclassed in Java?
10:07 18. Which of the following is not a Java access modifier?
10:37 19. Which exception is thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted?
11:14 20. Which method must be implemented by all threads in Java?
11:45 21. Which of the following is a checked exception in Java?
12:18 22. What is the default value of a local variable in Java?
12:49 23. Which method is used to find the length of a string in Java?
13:20 24. Which operator is used to concatenate two strings in Java?
13:51 25. Which of the following is a superclass of every class in Java?
14:21 26. Which statement is used to handle exceptions in Java?
14:53 27. Which package contains the Random class?
15:25 28. Which method is used to start a thread execution?
15:56 29. Which keyword is used for inheritance in Java?
16:31 30. What is the default value of an int variable in Java?
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