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Java 8 optional | optional class | optional class interview questions | java 8 interview | okay java
Java 8 Optional class
.isPresent()
.ifPresent()
.get()
.orElse()
.orElseGet()
orElse v/s orElseGet()
.orElseThrow()
.filter()
.map()
.flatMap()
What is optional in java 8 ?
Optional is Final class in Java 8
to handle values as ‘available’ or ‘not available’ instead of checking null values.
What are the different ways to create an optional object
.isPresent()
Boolean function
Returns true if there is a value present, otherwise false.
.get()
If a value is present in this Optional, returns the value, otherwise throws NoSuchElementException.
. ifPresent(consumer)
if a value is present, it invokes the specified consumer with the value, otherwise does nothing.
. orElseThrow(supplier)
Returns the contained value, if present, otherwise throws an exception to be created by the provided supplier.
// orElseThrow
. filter(predicate)
If a value is present and the value matches a given predicate, it returns an Optional describing the value, otherwise returns an empty Optional.
// Filter - apply a predicate
1. Java 8 new features
2. Java 8 functional interface part
3. Java 8 functional interface coding
4. Functional Interface prior to Java 8
5. Default methods in interface
6. Default methods Diamond Problem in java 8
7. Java 8 lambda expression
8. Lambda expression variable scope interview questions
9. Java 8 predicate functional Interface
10. Java 8 function interface
11. Java 8 consumer functional interface
12. java 8 supplier functional interface
13. Java 8 method reference
14. Java 8 optional class
15. Java 8 stream pipeline flow
16. Java 8 stream api operations
17. create java 8 stream
18. stream api - create java 8 streams
19. java 8 stream api- range v/s rangeclosed
20. java 8 stream api - filter | collect
21. java 8 stream api - map function distinct | filter
22. java 8 stream api - flatmap
23. java 8 interview question - sort employee list using stream api function
24. java 8 interview question - built in functional interfaces in java
25. Create Immutable class in Java
26. what is a web service ?
27. Watch Introduction to Microservices 08.50 Minutes
28. Watch Microservices components in one video 20 Minutes
29. Watch How to Install Spring Tool Suite on Windows Machine
Subscribe and share okayjava
Java 8 Optional class
.isPresent()
.ifPresent()
.get()
.orElse()
.orElseGet()
orElse v/s orElseGet()
.orElseThrow()
.filter()
.map()
.flatMap()
What is optional in java 8 ?
Optional is Final class in Java 8
to handle values as ‘available’ or ‘not available’ instead of checking null values.
What are the different ways to create an optional object
.isPresent()
Boolean function
Returns true if there is a value present, otherwise false.
.get()
If a value is present in this Optional, returns the value, otherwise throws NoSuchElementException.
. ifPresent(consumer)
if a value is present, it invokes the specified consumer with the value, otherwise does nothing.
. orElseThrow(supplier)
Returns the contained value, if present, otherwise throws an exception to be created by the provided supplier.
// orElseThrow
. filter(predicate)
If a value is present and the value matches a given predicate, it returns an Optional describing the value, otherwise returns an empty Optional.
// Filter - apply a predicate
1. Java 8 new features
2. Java 8 functional interface part
3. Java 8 functional interface coding
4. Functional Interface prior to Java 8
5. Default methods in interface
6. Default methods Diamond Problem in java 8
7. Java 8 lambda expression
8. Lambda expression variable scope interview questions
9. Java 8 predicate functional Interface
10. Java 8 function interface
11. Java 8 consumer functional interface
12. java 8 supplier functional interface
13. Java 8 method reference
14. Java 8 optional class
15. Java 8 stream pipeline flow
16. Java 8 stream api operations
17. create java 8 stream
18. stream api - create java 8 streams
19. java 8 stream api- range v/s rangeclosed
20. java 8 stream api - filter | collect
21. java 8 stream api - map function distinct | filter
22. java 8 stream api - flatmap
23. java 8 interview question - sort employee list using stream api function
24. java 8 interview question - built in functional interfaces in java
25. Create Immutable class in Java
26. what is a web service ?
27. Watch Introduction to Microservices 08.50 Minutes
28. Watch Microservices components in one video 20 Minutes
29. Watch How to Install Spring Tool Suite on Windows Machine
Subscribe and share okayjava
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