Top Most Asked Java Questions in Technical Interviews.

Here are the some most asked java questions in any technical interview :

Reference to these all Questions : Java

**- 1. Why is Java a platform-independent language?

• 2. Why is Java not a pure object-oriented language?
• 3. What is the difference between Heap and Stack Memory in Java? And how does Java utilize this?
• 4. How is Java different from C ?
• 5. Why does Java not make use of pointers?
• 6. What do you understand by an instance variable and a local variable?
• 7. What are the default values assigned to variables and instances in Java?
• 8. What do you mean by data encapsulation?
• 9. Tell us something about JIT compiler.
• 10. Can you tell the difference between the equals() method and equality operator (==) in Java?
• 11. Briefly explain the concept of constructor overloading.
• 12. Define Copy constructor in Java.
• 13. Can the main method be overloaded?
• 14. Comment on method overloading and overriding.
• 15. Can a single try block and multiple catch blocks co-exist in a Java program?
• 16. Explain the use of the final keyword in variables, methods, and classes.
• 17. Do final, finally, and finalize keywords have the same function?
• 18. Is it possible that the ‘finally’ block will not be executed? If yes, then list the cases.
• 19. When can you use the super keyword?
• 20. Can static methods be overloaded?
• 21. Why is the main method static in Java?
• 22. Can static methods be overridden?
• 23. What is the difference between static methods, static variables, and static classes in Java?
• 24. What is the main objective of garbage collection?
• 25. What are shallow copy and deep copy in Java?
• 26. What is a singleton class in Java?
• 27. What is a String pool?
• 28. How would you differentiate between a String, StringBuffer, and a StringBuilder?
• 29. Using relevant properties, highlight the differences between interfaces and abstract classes.
• 30. What is a Comparator in Java?
• 31. What are the differences between JVM, JRE, and JDK in Java?
• 32. What are the differences between HashMap and HashTable in Java?
• 33. What is the difference between a program and a process?
• 34. What is the difference between the ‘throw’ and ‘throws’ keywords in Java?
• 35. Does Java work as “pass by value” or “pass by reference”?
• 36. What is the ‘IS-A’ relationship in OOPs Java?
• 37. What happens if the static modifier is not included in the main method signature in Java?
• 38. What happens if there are multiple main methods inside one class in Java?
• 39. Will the finally block get executed when the return statement is written at the end of the try block and catch block?
• 40. Why does the Java array index start with 0?
• 41. Why is the remove method faster in a linked list than in an array?**

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