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Java 8 interview questions

  1.  What is the difference between a Stream and a Collection in Java 8?
  2. What are the main benefits of the Stream API in Java 8?
  3. How do you convert a Stream to a Collection in Java 8?
  4. What is the difference between map and flatMap in the Java 8 Stream API?
  5. How do you perform a parallel operation on a Stream in Java 8?
  6. How do you perform a filtering operation on a Stream in Java 8?
  7. What is the use of the Optional class in Java 8?
  8. What is the difference between an intermediate operation and a terminal operation in Java 8 Streams?
  9. What is the difference between forEach and forEachOrdered in the Java 8 Stream API?
  10. How do you perform a grouping operation on a Stream in Java 8?
  11. What is the difference between a reduction and a collect operation in Java 8 Streams?
  12. How do you perform a mapping operation on a Stream in Java 8?
  13. What is the use of the Stream.generate() method in Java 8?
  14. What is the use of the Stream.iterate() method in Java 8?
  15. What is the difference between a Stream and an IntStream in Java 8?
  16. What is the use of the Collectors class in Java 8?
  17. How do you perform a counting operation on a Stream in Java 8?
  18. What is the difference between sorted and sorted() in Java 8 Streams?
  19. What is the difference between peek and map in Java 8 Streams?
  20. How do you perform a reduce operation on a Stream in Java 8?
  21. What is the use of the limit operation in Java 8 Streams?
  22. What is the use of the skip operation in Java 8 Streams?
  23. What is the difference between min and max in Java 8 Streams?
  24. What is the difference between findFirst and findAny in Java 8 Streams?
  25. How do you perform a filter operation with multiple conditions in Java 8 Streams?
  26. How do you perform a mapping operation with multiple input values in Java 8 Streams?
  27. What is the difference between toArray and toArray(IntFunction) in Java 8 Streams?
  28. How do you perform an allMatch operation on a Stream in Java 8?
  29. How do you perform a noneMatch operation on a Stream in Java 8?
  30. How do you perform a anyMatch operation on a Stream in Java 8?
  31. What is the difference between parallelStream and stream in Java 8?
  32. How do you convert a Stream to an array in Java 8?
  33. What is the difference between collect and toList in Java 8 Streams?
  34. What is the difference between collect and toSet in Java 8 Streams?
  35. What is the difference between collect and toMap in Java 8 Streams?
  36. How do you perform a distinct operation on a Stream in Java 8?
  37. How do you perform a max operation on a Stream in Java 8?
  38. How do you perform a min operation on a Stream in Java 8?
  39. How do you perform a sum operation on a Stream in Java 8?
  40. How do you perform an average operation on a Stream in Java 8?
  41. What is the use of the reduce operation in Java 8 Streams?
  42. How do you use the Predicate interface in Java 8 Streams?
  43. What is the difference between a functional interface and a functional programming style in Java 8?
  45. What is the difference between collect and reduce in Java 8 Streams?
  46. How do you perform a groupingBy operation on a Stream in Java 8?
  47. How do you perform a partitioningBy operation on a Stream in Java 8?
  48. How do you perform a summarizingDouble operation on a Stream in Java 8?
  49. How do you perform a summarizingInt operation on a Stream in Java 8?
  50. How do you perform a summarizingLong operation on a Stream in Java 8?
  51. How do you perform a joining operation on a Stream in Java 8?
  52. How do you perform a mapping operation with index in Java 8 Streams?
  53. How do you perform a flatMap operation on a Stream in Java 8?
  54. What is the difference between IntStream, LongStream and DoubleStream in Java 8?
  55. How do you convert a Stream to a List in Java 8?
  56. How do you convert a Stream to a Set in Java 8?
  57. How do you convert a Stream to a Map in Java 8?
  58. How do you use the Stream.builder() method in Java 8?
  59. How do you use the Stream.of() method in Java 8?
  60. What is the difference between mapToInt, mapToLong and mapToDouble in Java 8 Streams?
  61. How do you perform a concat operation on two Streams in Java 8?
  62. How do you use the Stream.empty() method in Java 8?
  63. How do you use the Stream.ofNullable() method in Java 8?
  64. How do you perform a forEach operation on a Stream in Java 8?
  65. How do you use the Stream.concat() method in Java 8?
  66. How do you use the IntStream.of() method in Java 8?
  67. How do you use the LongStream.of() method in Java 8?
  68. How do you use the DoubleStream.of() method in Java 8?
  69. How do you use the IntStream.builder() method in Java 8?
  70. How do you use the LongStream.builder() method in Java 8?
  71. How do you use the DoubleStream.builder() method in Java 8?
  72. How do you perform a sort operation on a Stream in Java 8?
  73. How do you use the Stream.distinct() method in Java 8?
  74. How do you use the Stream.filter() method in Java 8?
  75. How do you use the Stream.flatMapToInt() method in Java 8?
  76. How do you use the Stream.flatMapToLong() method in Java 8?
  77. How do you use the Stream.flatMapToDouble() method in Java 8?
  78. How do you perform a map operation on a Stream in Java 8?
  79. How do you use the Stream.peek() method in Java 8?
  80. How do you use the Stream.limit() method in Java 8?
  81. How do you use the Stream.skip() method in Java 8?
  82. How do you use the Stream.sorted() method in Java 8?
  83. How do you use the Stream.forEachOrdered() method in Java 8?
  84. How do you use the Stream.parallel() method in Java 8?
  85. How do you use the Stream.sequential() method in Java 8?
  86. How do you use the Stream.unordered() method in Java 8?
  87. How do you use the IntStream.map() method in Java 8?
  88. How do you use the LongStream.map() method in Java 8?
  89. How do you use the DoubleStream.map() method in Java 8?
  90. How do you perform a reduce operation on a Stream in Java 8?
  91. How do you use the Stream.count() method in Java 8?
  92. How do you use the Stream.min() method in Java 8?
  93. How do you use the Stream.max() method in Java 8?
  94. How do you use the Stream.anyMatch() method in Java 8?
  95. How do you use the Stream.allMatch() method in Java 8?
  96. How do you use the Stream.noneMatch() method in Java 8?
  97. How do you use the Stream.findFirst() method in Java 8?
  98. How do you use the Stream.findAny() method in Java 8?
  99. How do you use the Stream.toArray() method in Java 8?
  100. What are some of the best practices to keep in mind while working with Java 8 Streams?

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