Below are the list of topics for Java 1.8 features :

• Lambda Expression
• Functional Interface
• Anonymous Inner class v/s Lambda Expression
• Default and static methods
• Java 8 – default and static methods
• Pre-defined Functional Interface (1 argument)
  1. Predicate
  2. Function
  3. Consumer
  4. Supplier
• Pre-defined Functional Interface (2 arguments)
  1. BiPredicate
  2. BiFunction
  3. BiConsumer
• Primitive Predicate Functional Interface
  1. IntPredicate
  2. LongPredicate
  3. DoublePredicate
• Primitive Function Functional Interface
  1. IntFunction
  2. LongFunction
  3. DoubleFunction
  4. ToIntFunction
  5. ToLongFunction
  6. ToDoubleFunction
  7. IntToLongFunction
  8. IntToDoubleFunction
  9. LongToIntFunction
  10. LongToDoubleFunction
  11. DoubleToIntFunction
  12. DoubleToLongFunction
• Primitive BiFunction Functional Interface
  1. ToIntBiFunction
  2. ToLongBiFunction
  3. ToDoubleBiFunction
• Primitive Consumer Functional Interface
  1. IntConsumer
  2. LongConsumer
  3. DoubleConsumer
  4. ObjIntConsumer
  5. ObjLongConsumer
  6. ObjDoubleConsumer
• Primitive Supplier Functional Interface
  1. IntSupplier
  2. LongSupplier
  3. DoubleSupplier
  4. BooleanSupplier
• UnaryOperator Functional Interface and its primitive types
  1. IntUnaryOperator
  2. LongUnaryOperator
  3. DoubleUnaryOperator
• BinaryOperator Functional Interface and its primitive types
  1. IntBinaryOperator
  2. LongBinaryOperator
  3. DoubleBinaryOperator
• Method and Constructor references
• Stream API
  1. How to create Stream
  2. Stream filter() method with examples
  3. Stream map() method with examples
  4. Stream flapMap method with examples
  5. Difference between map() and flatMap() in Stream API
  6. Stream forEach() method with examples
  7. Stream forEachOrdered() method
  8. Stream sorted() method with examples
  9. Stream count() method with examples
  10. Stream distinct() method with examples
  11. Stream min() and max() methods
  12. Stream skip() and limit() methods
  13. Stream peek() method with examples
  14. Stream anyMatch() method with examples
  15. Stream noneMatch() method with examples
  16. Stream allMatch() method with examples
  17. Stream findFirst() and findAny() methods
  18. Stream collect() method with examples
  19. Stream concat() method with examples
  20. Stream toArray() method with examples
  21. Stream reduce() method with examples
  22. Stream mapToInt() method with examples
  23. Stream mapToLong() method with examples
  24. Stream mapToDouble() method with examples
  25. Stream flatMapToInt() method with examples
  26. Stream flatMapToLong() method with examples
  27. Stream flatMapToDouble() method with examples
• Optional Classes
• Date and Time API (JODA Time)
  • Java 8 – LocalDate with method details and examples
  • Java 8 – LocalTime with method details and examples
  • Java 8 – LocalDateTime with method details and examples
  • Java 8 – ZonedDateTime with method details and examples
  • Java 8 – Display all Zones and its Offset using ZoneId and ZoneOffset
  • Java 8 – OffsetDateTime with method details and examples
  • Java 8 – Instant with method details and examples
  • Java 8 – How to display Zones for particular Offset ?
  • Java 8 – Clock with method details and examples
  • Java 8 – OffsetTime with method details and examples
  • Java 8 – How to get current Date and Time ?
  • More Java 8 Date/Time API examples

Java 8 Comparator – Sorting methods

• Java 8 – Comparator.naturalOrder() and Comparator.reverseOrder()
• Java 8 – reversed() method
• Java 8 – Comparator.comparing() method
• Java 8 – Comparator.comparing() method for custom/reverse sorting
• Java 8 – Comparator.comparingInt() method
• Java 8 – Comparator.comparingLong() method
• Java 8 – Comparator.comparingDouble() method
• Java 8 – Comparator.nullsFirst() and nullsLast() methods
• Java 8 – thenComparing() method (2-level attributes)
• Java 8 – thenComparing() method for custom/reverse sorting (2-level attributes)
• Java 8 – thenComparingInt() method (2-level attributes)
• Java 8 – thenComparingLong() method (2-level attributes)
• Java 8 – thenComparingDouble() method (2-level attributes)

Java 8 Comparator – Collection Sorting

• Java 8 – How to sort ArrayList elements ?
• Java 8 – Sorting List of primitive, String & Custom Objects
• Java 8 – Sorting ArrayList using sort() method of List
• Java 8 – How to sort LinkedList elements ?
• Java 8 – How to sort HashSet elements ?
• Java 8 – How to sort LinkedHashSet elements ?
• Java 8 – How to sort TreeSet in descending order ?
• Java 8 – How to sort List and Arrays with null values present ?
• Java 8 – How to sort Arrays in Ascending and Descending order ?
• Java 8 – Sorting list of objects on multiple fields (3-level attributes)
• Java 8 – How to Sort String[] Arrays by its length in Ascending/Descending order ?
• Java 8 – How to Sort String List by its length in Ascending/Descending order ?

Java 8 Comparator – Map Sorting

• Java 8 – How to Sort HashMap Key-Value pairs by its Key in ascending & descending order ?
• Java 8 – How to Sort HashMap Key-Value pairs by its Value in ascending & descending order ?
• Java 8 – Sorting HashMap entries by its Key and Value
• Java 8 – How to Sort a Map entries by its Key – 6 ways ?
• Java 8 – How to Sort a Map entries by its Value – 6 ways ?
• Java 8 – How to sort LinkedHashMap entries by its Key in ascending/descending order ?
• Java 8 – How to sort LinkedHashMap entries by its Value in ascending/descending order ?
• Java 8 – How to sort TreeMap entries in descending order ?

Java 8 Comparator – Date Sorting

• Java 8 – How to sort List by java.util.Date in different ways ?
• Java 8 – How to sort List by java.time.LocalDate in different ways ?
• Java 8 – How to sort List by java.time.LocalDateTime in different ways ?
• Java 8 – How to sort List by java.time.ZonedDateTime in different ways ?
• Java 8 – How to sort List by java.time.OffsetDateTime in different ways ?

Java 8 – Iterating Collection

• Java 8 – Different ways to iterate through List – 7 ways
• Java 8 – Various ways to iterate through ArrayList – 5 ways
• Java 8 – Iterating List using forEach()
• Java 8 – Iterating Set using forEach()

Java 8 – Iterating Arrays

• Java 8 – Iterate Arrays in 5 ways
• Java 8 – How to Iterate over char[] Arrays ?

Java 8 – Iterating Map

• Java 8 – Iterating Map using forEach()
• Java 8 – Iterating HashMap in 8 ways
• Java 8 – Various ways to iterate through Hashtable – 6 ways
• Java 8 – Various ways to iterate over HashMap of ArrayList

Java 8 – Removing duplicates

• Java 8 – How to find duplicate and its count in a Stream or List ?
• Java 8 – How to remove duplicates from ArrayList ?
• Java 8 – How to remove duplicates from LinkedList ?
• Java 8 – How to find duplicate and its count in an Arrays ?
• Java 8 – How to remove duplicate from Arrays ?
• Java 8 – Various ways to remove duplicate elements from Arrays
• Java 8 – How to remove an entry from HashMap by comparing keys ?
• Java 8 – How to remove an entry from HashMap by comparing values ?
• Java 8 – How to remove an entry with largest Key in a Map or HashMap ?
• Java 8 – How to remove an entry with largest Value in a Map or HashMap ?
• Java 8 – How to remove an entry with smallest Key in a Map or HashMap ?
• Java 8 – How to remove an entry with smallest Value in a Map or HashMap ?

Java 8 – Filtering

• Java 8 – Filter null and empty values from a Stream
• Java 8 – Filter a Map by its Key and Value
• Java 8 – How to store multiple values for single key in HashMap and Filter them ?
• Java 8 – How to get Keys from Value in HashMap using Stream ?

Java 8 – Merging

• Java 8 – Merging two or more Stream of elements
• Java – Merging 2 Arrays using List/Set approach
• Java – Concatenating 2 Arrays using Third Arrays approach
• Java 8 – How to Merge or Concatenate 2 Arrays using Stream API ?
• Java 8 – How to merge/concatenate/join two lists into single list ?

Java 8 – Collection Conversion

• Java – Conversion of List to Map
• Java – Conversion of Map to List
• Java – Conversion of Arrays to List
• Java – Conversion of List to Arrays
• Java 8 – Conversion of List to Map
• Java 8 – Conversion of Map to List
• Java 8 – Conversion of Arrays to List
• Java 8 – Conversion of List to Arrays
• Java 8 – How to convert HashMap to ArrayList ?

Java 8 – Stream Conversion

• Java 8 – Conversion of Arrays to Stream
• Java 8 – Conversion of Stream to Arrays
• Java 8 – Convert List to Stream
• Java 8 – Convert Stream to List
• Java 8 – Convert Stream to ArrayList
• Java 8 – Convert Stream to LinkedList
• Java 8 – Convert Stream to HashSet
• Java 8 – Convert Stream to LinkedHashSet
• Java 8 – Convert Stream to TreeSet

Java 8 – Map Conversion

• Java 8 – Convert Stream to HashMap
• Java 8 – Convert Stream to LinkedHashMap
• Java 8 – Convert Stream to TreeMap
• Java 8 – Convert Stream to ConcurrentHashMap

Java 8 – String methods

• Java 8 – How to get a specific character from String ?
• Java 8 – How to check whether particular word/letter/sub-string is present in the String ?
• Java 8 – How to check whether particular String endsWith specific word/letter ?
• Java 8 – How to check whether particular String startsWith specific word/letter ?
• Java 8 – How to check whether a String is empty or not ?
• Java 8 – How to get length of a String ?
• Java 8 – How to convert a String into char[] Arrays using Stream ?
• Java 8 – How to convert a String into char[] Arrays in different ways ?
• Java 8 – How to convert a String into UpperCase String ?
• Java 8 – How to convert a String into LowerCase String ?
• Java 8 – How to remove leading and trailing whitespaces in a String ?
• Java 8 – How to replace a String with another String ?
• Java 8 – How to split a String based on delimiter ?
• Java 8 – How to convert primitive data-types into String ?
• Java 8 – How to join String[] Arrays elements using different delimiter ?
• Java 8 – How to join List of String elements using different delimiter ?
• Java 8 – How to find 1^st and last index of particular character/substring in a String ?
• Java 8 – How to get hashCode of a String ?
• Java 8 – How to get sub-string from a String ?
• Java 8 – How to convert String to ArrayList ?

Java 8 – String & File operations

• Java 8 – Count and print number of lines and words in a text file
• Java 8 – Count and print number of repeated word occurrences in a text file
• Java 8 – Count and print number of repeated character occurrences in a String
• Java 8 – Count and print number of Vowels and Consonants in a String
• Java 8 – Reverse each words in a String using Stream and Collectors
• Java 8 – Reverse complete/entire String using Stream and Collectors
• Java 8 – Remove input-ted Character from a given String
• Java 8 – How to split a String and Collect to any Collection ?
• Java 8 – How to check whether given String contains only Alphabets or Letters ?
• Java 8 – How to check whether given String contains only Digits ?
• Java 8 – How to check whether given String contains Alphanumeric characters only ?
• Java 8 – How to convert first character of every word to Uppercase ?
• Java 8 – How to convert duplicate characters to Uppercase in a String ?
• Java 8 – How to remove special characters from String ?
• Java 8 – How to remove last comma (,) from String ?
• Java 8 – How to count length of last word in a String ?

Java 8 – Min/Max or Largest/Smallest programs

• Java 8 – Find Largest number in an Arrays or List or Stream ?
• Java 8 – Find Smallest number in an Arrays or List or Stream ?
• Java 8 – Find 2^nd Largest number in an Arrays or List or Stream ?
• Java 8 – Find 2^nd Smallest number in an Arrays or List or Stream ?
• Java 8 – Find sum of Largest 2 numbers in an Arrays or List or Stream ?
• Java 8 – Find sum of Smallest 2 numbers in an Arrays or List or Stream ?
• Java 8 – Find 1^st and Last elements in an Arrays ?
• Java 8 – Find 1^st and Last elements in a List or ArrayList ?
• Java 8 – Find 1^st and Last elements in a Set or HashSet ?
• Java 8 – Find 1^st and Last entries in a Map or HashMap ?
• Java 8 – Find sum and average of a List or ArrayList ?
• Java 8 – How to calculate sum and average of an Arrays ?
• Java 8 – How to find largest Key in a Map or HashMap ?
• Java 8 – How to find largest Value in a Map or HashMap ?
• Java 8 – How to find smallest Key in a Map or HashMap ?
• Java 8 – How to find smallest Value in a Map or HashMap ?

Java 8 – Longest & Shortest programs

• Java 8 – Find Longest String in an Arrays or List or Stream ?
• Java 8 – Find Shortest String in an Arrays or List or Stream ?
• Java 8 – Find 3^rd Longest String in an Arrays or List or Stream ?
• Java 8 – Find 3^rd Shortest String in an Arrays or List or Stream ?
• Java 8 – Find all longest Strings in List or Arrays or Stream ?
• Java 8 – Find all shortest Strings in List or Arrays or Stream ?

Java 8 programs – Miscellaneous

• Java features version-wise
• Java – How to print an Arrays elements ?
• Java – String join() method
• Java 8 – Connect to MS Access database using JDBC
• Java 8 – How to check whether a number exists in an Arrays or List or Stream ?
• Java 8 – How to find even/odd number from a range of numbers ?

Java 8 – Interview Question & Answers

• Java 8 – Interface interview question and answers

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