30 Core Java Interview Questions

30 Core Java Interview Questions

Sridhar Raj P Sridhar Raj P

Sridhar Raj P

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发布日期: 2024年4月26日
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  1. What is Java? Explain its key features.
  2. What are the differences between JDK, JRE, and JVM?
  3. What are the main Object-Oriented Programming (OOP) concepts in Java?
  4. Explain the difference between an abstract class and an interface in Java.
  5. What is the significance of the static keyword in Java?
  6. What is the difference between == and .equals() in Java?
  7. How does Java handle multithreading?
  8. Explain the synchronized keyword in Java and its importance in multithreading.
  9. What are the different types of exceptions in Java? Explain checked and unchecked exceptions.
  10. What is the difference between throw and throws in Java exception handling?
  11. What is the purpose of the finalize() method in Java?
  12. How does Java support platform independence?
  13. What are the access modifiers in Java, and what are their respective meanings?
  14. What is the purpose of the super keyword in Java?
  15. What is method overloading and method overriding in Java?
  16. Explain the difference between StringBuilder and StringBuffer classes.
  17. What is the difference between ArrayList and LinkedList in Java?
  18. Explain the Comparable and Comparator interfaces in Java.
  19. How does Java support polymorphism?
  20. What is the use of the transient keyword in Java?
  21. What is the purpose of the enum keyword in Java?
  22. How does Java handle garbage collection?
  23. Explain the difference between HashMap and HashTable in Java.
  24. What is serialization in Java?
  25. How do you handle concurrent modification exceptions in Java collections?
  26. What is the difference between == and .equals() when comparing objects?
  27. What is the purpose of the ClassLoader in Java?
  28. Explain the final keyword in Java and its different usages.
  29. How does Java support inheritance?
  30. What is the role of the finalize() method in Java, and when is it called?

These questions cover a broad range of topics in core Java and are commonly asked in interviews. Make sure to understand each concept thoroughly and be prepared to explain them concisely.

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