Java 8 Source Code Examples

This page contains a list of Java 8 source code examples with output.

On this page, you can find source code examples for the below Java 8 features:

• Java 8 Lambda Expressions
• Java 8 Functional Interfaces
• Java 8 Method References
• Java 8 Stream API
• Java 8 Optional Class
• Java 8 Collectors Class
• Java 8 StringJoiner Class
• Java 8 Static and Default Methods in Interface

Java 8 Lambda Source Code Examples

1. Java Simple Lambda Expression Example
2. Java Lambda Expressions Multiple Statements
3. Java Lambda Expressions forEach Example
4. Java Lambda Expression with Multiple Parameters Example
5. Java Lambda Expression Runnable Example
6. Java Lambda Expression Comparator Example
7. Refactoring Factory Design Pattern with Lambdas
8. Refactoring Chain of Responsibility Pattern with Lambdas
9. Refactoring Observer Design Pattern with Lambdas
10. Refactoring Strategy Design Pattern with Lambdas
11. Iterate HashMap with forEach() + Lambda Expression Example
12. Iterate HashSet with forEach() + Lambda Expression Example
13. Iterate ArrayList with forEach() + Lambda Expression Example

Java Method References Source Code Examples

1. Java method reference to a constructor example
2. Java method reference to static method example
3. Java method reference to an instance method of an object example
4. Java method reference to an instance method of an arbitrary object of a particular type

Java 8 Stream API Source Code Examples

1. Java 8 - Create Stream Object from Arrays Example
2. Java 8 Creating a Stream from an Array
3. Java 8 - Create Stream Object from Collection, List, Set
4. Java 8 Stream - Sort List of String objects in Descending Order Example
5. Java 8 Stream - Sort List of String objects in Ascending Order Example
6. How to convert a Java 8 Stream to an Array?
7. Java 8 Stream - allMatch(),anyMatch() and noneMatch() Example
8. Java 8 Stream - Sort List of Objects by Multiple Fields
9. Java 8 Stream - Sort List of Custom Objects in Ascending and Descending Order
10. Java 8 - Stream filter(), forEach(), collect() and Collectors.toList() Example
11. Java Stream filter null values example
12. Java Stream filter map by values example
13. Java Stream filter map by keys example
14. Java 8 Collectors.counting() Example
15. Java 8 Collectors.averagingDouble() Example
16. Java 8 Collectors.toSet() Example
17. Java 8 Collectors.toList() Example
18. Java 8 Collectors.joining() example
19. Java 8 Stream multiple filter operations
20. Java 8 Stream filter map by keys
21. Java 8 Stream filter map by values
22. Java 8 Stream collect to list example
23. Java 8 Stream Collectors.counting() exmaple
24. Java 8 Collectors.collectingAndThen() example
25. Java 8 Collectors.toList() Example
26. Java 8 Collectors.minBy() and Collectors.maxBy() example

Java Stream Methods/APIs Examples

1. Java Stream filter() Example
2. Java Stream map() Example
3. Java Stream flatMap() Example
4. Java Stream distinct() Example
5. Java Stream limit() Example
6. Java Stream peek() Example
7. Java Stream anyMatch() Example
8. Java Stream allMatch() Example
9. Java Stream noneMatch() Example
10. Java Stream collect() Example
11. Java Stream count() Example
12. Java Stream findAny() Example
13. Java Stream findFirst() Example
14. Java Stream forEach() Example
15. Java Stream min() Example
16. Java Stream max() Example
17. Java Stream reduce() Example
18. Java Stream toArray() Example

Java 8 Functional Interface Source Code Examples

1. Java Function Functional Interface Example
2. Java Supplier Functional Interface Example
3. Java Consumer Example
4. Java BiConsumer Example
5. Java BiFunction Example
6. Java Predicate Example
7. Java 8 LongConsumer Example
8. Java 8 IntConsumer Example
9. Java 8 DoubleConsumer Example
10. Java StringJoiner Example

Optional Class Source Code Examples

• Create Optional Class Object in Java - empty(), of(), ofNullable() Methods
• Optional get() Method - Get Value from Optional Object in Java
• Optional isPresent() Method Example
• Optional orElse() Method Example
• Optional orElseGet() Method Example
• Optional orElseThrow() Method Example
• Optional filter() and map() Method Examples

Java 8 - Misc

1. Java 8 program that counts the number of vowels and consonants in a given string
2. Java 8 program that reverses words of a given string
3. Java 8 - Copy List into Another List Example
4. Check Whether the Given Year is Leap Year or Not in Java
5. Java 8 forEach() Array Example
6. Java 8 forEach() Map Example
7. Java 8 forEach() Set Example
8. Java 8 forEach() List Example

Java 8 Date-Time API Source Code Examples

1. Getting current date and time with Clock
2. Convert LocalDate to Date in Java
3. Convert LocalDateTime into Date in Java
4. Connvert java.util.Date to java.time.LocalDateTime Example
5. Convert java.util.Date to java.time.LocalDate Example
6. Duration Between Two LocalDate in Java
7. Java Convert ZonedDateTime to String Example
8. Convert String to ZonedDateTime in Java
9. Compare ZonedDateTime Objects in Java
10. How to Get Hour, Minute, Second from ZonedDateTime in Java
11. Convert ZonedDateTime to LocalTime Example
12. Convert ZonedDateTime to LocalDateTime in Java
13. Java ZonedDateTime now() and of() Method Example
14. Convert LocalDateTime to LocalTime in Java
15. Convert LocalDateTime to LocalDate in Java
16. Compare LocalDateTime Objects in Java
17. Java LocalDateTime - Get Hour, Minute and Second
18. How to Get Day Month and Year from LocalDateTime in Java
19. Java LocalDateTime now() Method Example
20. How to Get Current Date Time in Java
21. Convert LocalDate to String in Java
22. Convert String to LocalDate in Java
23. Java LocalDate isLeapYear() Method Example
24. How to Get Number of Days from Month and Year using LocalDate in Java
25. Compare Java LocalDate Objects Example
26. How to Add Days Weeks Months and Years to LocalDate in Java
27. How to get Day Month and Year from LocalDate in Java
28. Java LocalDate now() Method Example - Get Current Date and Specific Date
29. Convert LocalTime to String in Java
30. Convert String to LocalTime in Java
31. Java LocalTime isBefore() and isAfter() Method Example
32. How to Compare Time in Java
33. Java 8 - LocalTime getHour(), getMinute(), getSecond() and getNano() Example
34. Java LocalTime now() Method Example - Get Current Time and Specific Time
35. Java 8 Get Local Date Time in All Available Time Zones
36. How to get year, month, day, hours, minutes, seconds and milliseconds of LocalDateTime in Java 8?
37. How to get year, month, day, hours, minutes, seconds and milliseconds of Date in Java?
38. Difference between Two Dates in Java
39. Create LocalDateTime from LocalDate and LocalTime in Java