Top 50+ Java Developer Interview Question And Answer For Intermediate to Experienced in 2022

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Top Java Developer Interview Question And Answer

Here is the compiled list of the questions:

  1. String API vs Collections API
  2. Functional Interface
  3. arrow function
  4. java 1.7 vs 1.8 ( Java 8 Documentation )
  5. the new feature in date Time API and what problem it solves
  6. what is a Bean
  7. What Is The Difference Between @Bean and @Component and When to Use What?
  8. Solution for Scoped Bean Injection Problem in Spring
  9. Factory vs abstract factory design pattern
  10. strategy design pattern
  11. isolation level in spring transaction
  12. classloader in java
  13. chain of responsibility principle
  14. Exception propagation in Thread
  15. cyclic barrier and countdown latches
  16. semaphores
  17. how to start two threads exactly same time
  18. Hibernate cache level
  19. procedure vs function
  20. union vs unionAll in SQL
  21. Functional Interface
  22. what is optional and what is the use of it.
  23. Immutable class and deep cloning
  24. map vs flat map
  25. sequential processing vs parallel processing
  26. what is the use of Lambda expression
  27. fork and join in java 8
  28. custom array list
  29. HashMap vs tree Map
  30. why null is not allowed in TreeMap
  31. java 8 new feature
  32. java 8 filter student list age>5 or any first find record with given condition / get list of student name only.
  33. io stream vs stream API
  34. Integer i=100 j=100 i==j if x=1000 y =1000 i==j?
  35. hibernate get vs load
  36. spring internal work
  37. class vs object lock
  38. write a program for an object lock
  39. type of scope in spring
  40. session vs session factory
  41. SQL joins
  42. write rest API
  43. multi-threading
  44. Database
  45. microservices
  46. the three-ton object like singleton
  47. facade decorated flyway  design pattern
  48. spring IOC vs di
  49. bean scope
  50. @controller vs @Retcontroller vs @Service vs @Repository
  51. what change in the collection in java 8
  52. primary vs unique
  53. trigger
  54. HQL vs criteria query
  55. ClassNotFoundException vs NoClassDefFoundError
  56. Executer vs ExecuterService
  57. @SpringBootApplication use
  58. HashMap internal working – the algorithm used inside
  59. HashSet internal working – the algorithm used inside
  60. Joins?
  61. Hibernate load vs get?
  62. Hibernate cash type?
  63. java type reference
  64. java memory model
  65. database constraint
  66. Custom Exception
  67. equal vs hash code contract java
  68. IOC vs DI
  69. BeanFactory vs ApplicationContext
  70. Constructor vs setter autowire
  71. Hibernate vs mybaites
  72. count(1) is faster/optimized than count(*) because:
  73.  count(*) has to iterate through all the columns,
  74. But count(1) iterates through only one column.
  75. count(*) vs count(1)
  76. JDBC vs hibernate which performance is good?
  77. so link list and array list are index base? performance? speed?

Java Concurrency related Topics

Java Concurrency is one of the most asked topics for java developers. 

  • Synchronization utilities
    CountDownLatch in Java 
    CyclicBarrier in Java 
    Difference Between CountDownLatch And CyclicBarrier in Java
    Phaser in Java 
    Exchanger in Java 
    Semaphore in Java 
  • Concurrent Collections
    ConcurrentHashMap in Java
    Difference Between HashMap And ConcurrentHashMap in Java
    CopyOnWriteArrayList in Java
    Difference Between ArrayList And CopyOnWriteArrayList in Java
    CopyOnWriteArraySet in Java
    ConcurrentSkipListMap in Java
    ConcurrentSkipListSet in Java
    ConcurrentLinkedQueue in Java
    ConcurrentLinkedDeque in Java
  • BlockingQueue
    BlockingQueue in Java Concurrency
    ArrayBlockingQueue in Java Concurrency
    LinkedBlockingQueue in Java Concurrency
    PriorityBlockingQueue in Java Concurrency
    SynchronousQueue in Java
    DelayQueue in Java Concurrency
    LinkedTransferQueue in Java
  • Locks
    ReentrantLock in Java Concurrency
    Difference Between ReentrantLock And Synchronized
    ReentrantReadWriteLock in Java
    StampedLock in Java
  • BlockingDeque
    BlockingDeque in Java Concurrency
    LinkedBlockingDeque in Java
  • Executors
    Callable And Future in Java Concurrency
    Difference Between Runnable And Callable in Java
    Executor And ExecutorService in Java Concurrency
    ThreadPoolExecutor – Java Thread Pooling With ExecutorService
    Java ScheduledThreadPoolExecutor – Task Scheduling in Java
    CompletableFuture in Java With Examples
    Atomic variables
    AtomicInteger in Java Concurrency
    AtomicLong in Java Concurrency
  • Concurrency concepts
    Lock Striping in Java 
    Non-Blocking Algorithms
    Busy Spinning in Multi-Threading
    Blocking Methods in Java 
    Java Concurrency interview questions
    Java Concurrency Interview Questions And Answers.

Topic-wise Interview Questions List ( Link will come soon)

    1. Java OOP Interview Questions And Answers
    2. Core Java Basics Interview Questions And Answers
    3. Java String Interview Questions And Answers
    4. Java Exception Handling Interview Questions And Answers
    5. Java Multithreading Interview Questions And Answers
    6. Java Collections Interview Questions And Answers
    7. Java Concurrency Interview Questions And Answers
    8. Java Lambda Expressions Interview Questions And Answers
    9. Java Stream API Interview Questions And Answers

These are some compiled lists of Java Developer Interview Question And Answer

If you like to be a Java Full Stack Developer, please read our article Full-Stack: Your Guide to Becoming a Full-Stack Developer in 2021-22

 

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