Explored new features of Java9/11, covering features like jshell, HTTP client, module, stack walker, etc.

1. What’s new in
Java9/11
- Kunal Sethi (Software Consultant)
- Jasmine Kaur (Software Consultant)

2. Agenda
❏ Jshell
❏ Improvements
❏ StackWalker
❏ Http2 Client
❏ Modularity

3. Jshell(Java REPL)
➢ Jshell is nothing it’s just java repl
How to start jshell
>> jshell
How to exit from jshell
>> /exit
>> /ex

4. Improvemen
ts
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➢ Convenience factory methods for collections.
eg. List.of(1, 2 , 3, 4 , 5)
eg. Map.of(1, “Kunal”, 2, “Jasmine”)
eg. Set.of(1, 2, 2 ,3 , 5 , 9)

5. Improvemen
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➢ Streams API
Methods: dropWhile(), takeWhile()
Method: Intstream.iterate()
Method: Stream.ofNullable()

6. Improvemen
ts
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➢ Interface
Interface with private methods.
➢ try with resource
Effectively final try with resource.
➢ Optional
ifPresentOrElse()
Optional.stream()

7. Improvemen
ts
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➢ CompletableFutures
Methods: completeOnTimeout()
orTimeout()
copy()

8. StackWalker
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❏ StackWalker is thread-safe. Multiple threads can share a single
StackWalker object to traverse its own stack.
eg. StackWalker.getInstance.walk()

9. Http2 Client
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❏ The protocol-specific requirements are defined in the
Hypertext Transfer Protocol Version 2 (HTTP/2), the
Hypertext Transfer Protocol (HTTP/1.1), and The WebSocket Protocol.
❏ This new API is kind of built around three main classes these are:
● HttpClient
● HttpRequest
● HttpResponse

10. Modularity : JPMS ( Java
Platform Modular System)
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Comparison between Java 1.8 and Java 1.9
❏ NoClassDefFoundError
❏ Version Conflict
❏ Security Issues
❏ Bigger size

11. Modularity : JPMS ( Java
Platform Modular System)
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❏ Module Structure

12. Modularity : JPMS ( Java
Platform Modular System)
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What If???

13. References:
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❏ https://www.youtube.com/watch?v=K8Jc_EaBVMI
❏ https://www.youtube.com/watch?v=0RegttLUXeU
❏ https://blog.knoldus.com/
❏ https://www.youtube.com/watch?v=Yacu1yUktjY

14. Thank You!