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JAVA Interview FAQs by DURGA Sir (Youtube Videos)
 

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Q1. What is the Difference between final, finally, finalize?




Q2. Difference between "== operator" and "equals() method" in java?



Q3. What are the various modifiers available in java ?




Q4. Differences between String and StringBuffer?



Q5. Difference between StringBuffer and StringBuilder?



Q6 String vs StringBuffer vs StringBuilder?




Q7 Interface vs abstract class vs concrete class ?




Q8 Access Specifiers vs Access Modifiers?



Q9 Difference between Interface and Absract Class ?



Q10 Explain about System.out.println(); ?


Q11.(A) Explain about Main() [Syntax & Alternative declarations]; ?


Q11.(B) Explain about Main() [Overloading, inheritance, overriding & method hiding]; ?


Q11.(C) Explain about Main() [1.7 Version Enhancements]; ?



Q12.(A) Difference between Overloading and Overriding? (part-I)



Q12.(B) Difference between Overloading and Overriding ?(part-II)



Q13.Difference between Parent p = new Child(); and Child c = new Child(); ?



Q14. Various possible combinations of try-catch-finally;?



Q15. Difference between Exception and Error ?



Q16. Difference between Checked exceptions and Unchecked exceptions ?



Q17. Differences between fully checked exceptions and partially checked exc..?



Q18. Control flow in try - catch ( Java Exception Handling)?



Q19. Control flow in try catch finally (Java Exception Handling) ?


Q20. Collections - Need of Collection Framework ?


Q21. Collections - Difference between Arrays and Collections ?


Q22. Collection and Collection Framework ?


Q23. Difference between Collection and Collections ?


Q24. 9 key interfaces of Collection framework - Collection ?


Q25. 9 key interfaces of Collection framework - ii. List ?


Q26. 9 key interfaces of Collection framework - iii. Set ?


Q27. Difference between List and Set ?


Q28. 9 key interfaces of Collection framework iv SortedSet v Navigable Set ?


Q29.key interfaces of Collection framework vi. Queue ?


Q30. 9 key interfaces of Collection framework vii Map?


Q31. 9 key interfaces of Collection framework viii SortedMap ix NavigableMap?


Q32. Overview of Collection framework ?


Q33. Collection Framework - Collection interface details?


Q34. Collection Framework - List interface details?


Q35. Collection Framework - ArrayList details?


Q36.Differences between ArrayList and Vector?


Q37.How to get Synchronized version of ArrayList - Collections?


Q38.LinkedList details - Collections?


Q39.Differences between ArrayList and LinkedList?


Q40.Stack class details (Collection Framework)?


Q41.Three Cursors of Java - Enumeration (Collections Framework ) ?


Q42.Vector class details (Collection Framework ) ?


Q43.Three Cursors of Java - Iterator (Collection Framework) ?


Q44.Three Cusors of Java ListIterator (Collection Framework ) ?


Q45.Comparison of the three Cursors of Java (Collection Framework) ?


Q46.Implementation Classes of the three Cursors of Java (Collection Framework) ?


Q47. HashSet (Collection Framework)?


Q48. LinkedHashSet (Collection Framework) ?