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
  • How to create Stream
  • Stream filter() method with examples
  • Stream map() method with examples
  • Stream flapMap method with examples
  • Difference between map() and flatMap() in Stream API
  • Stream forEach() method with examples
  • Stream forEachOrdered() method
  • Stream sorted() method with examples
  • Stream count() method with examples
  • Stream distinct() method with examples
  • Stream min() and max() methods
  • Stream skip() and limit() methods
  • Stream peek() method with examples
  • Stream anyMatch() method with examples
  • Stream noneMatch() method with examples
  • Stream allMatch() method with examples
  • Stream findFirst() and findAny() methods
  • Stream collect() method with examples
  • Stream concat() method with examples
  • Stream toArray() method with examples
  • Stream reduce() method with examples
  • Stream mapToInt() method with examples
  • Stream mapToLong() method with examples
  • Stream mapToDouble() method with examples
  • Stream flatMapToInt() method with examples
  • Stream flatMapToLong() method with examples
  • 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 – How to sort HashMap by its Values first and then by its Keys ?

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 find and count duplicate values in a Map or HashMap ?
• Java 8 – Find employee count in each department from the List of employees ?
• Java 8 – Find duplicate count from Integer[] arrays ?

Java 8 – Removing Map Entry

• 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 – How to remove an entry based on the Key in a Map or HashMap ?
• Java 8 – How to remove an entry based on the 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 – How to Reverse a String in place ?
• 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 – Finding Map Entry

• Java 8 – How to find an entry with Largest Key in a Map or HashMap ?
• Java 8 – How to find an entry with Largest Value in a Map or HashMap ?
• Java 8 – How to find an entry with Smallest Key in a Map or HashMap ?
• Java 8 – How to find an entry with Smallest Value in a Map or HashMap ?
• Java 8 – How to find an entry based on the Key in a Map or HashMap ?
• Java 8 – How to find an entry based on the 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 – How to find common & uncommon elements from 2 Lists ?

Java 8 – Interview Question & Answers

• Java 8 – Interface interview question and answers

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