Introduction to Java 11
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The document provides an introduction to Java 11, highlighting its status as the second long-term support (LTS) release, and details the changes, features, and migration considerations for developers. Key updates include the removal of certain features, the introduction of new functionalities such as the HTTP client and utility string methods, and the transition to commercial licensing terms. Additional resources and recommended tools for migration are also included.
![Optional.isEmpty()
01
This method returns false if the value of any optional object is empty
and else returns true.
jshell> Optional<String> name = Optional.of("Deepak");
name ==> Optional[Deepak]
jshell> name.isEmpty();
$4 ==> false](https://image.slidesharecdn.com/knolx-java11-introduction-200921071123/85/Introduction-to-Java-11-15-320.jpg)
Introduction to Java 11
- 1. Presented By : Deepak Mehra(Sr.Software Consultant- L2) & Sanjana Aggarwal(Software Consultant) Introduction to Java 11
- 2. Agenda 01 ● Java 11 ● How to download Java 11 free version ● Important changes and information. ● Java 11 Features and Enhancements ● Removed Features ● Deprecated Features ● Migration to Java 11 ● Demo
- 3. Java 11 01 ● Java 11 is the second LTS release after Java 8. ● Java 11 onwards, Oracle JDK would no longer be free for commercial use. ● You can use it in developing stages but to use it commercially, you need to buy a license. If you don’t, you can get an invoice bill from Oracle any day!
- 4. Java 11 free version 01 Below is the link to download Java 11’s free version which can be used for developments and educational purpose. https://www.oracle.com/java/technologies/javase-jdk11-downloads.html Java 11 onwards, they have two different JDK builds: ● Oracle JDK (commercial) ● Oracle OpenJDK (open source)
- 5. Changes and information 01 ● The deployment stack required for running applets and web applications has been removed from JDK which was deprecated in JDK 9. ● Java language translation for French, German, Italian, Korean, Portuguese (Brazilian), Spanish, and Swedish is no longer provided. ● Updated packaging format for Windows has changed from tar.gz to .zip
- 6. Java 11 Features 01 ● Running Java File with single command ● Local-Variable Syntax for Lambda Parameters ● New File Methods ● JEP 321: HTTP Client ● New utility methods in String class ● Nested Based Access Control ● TimeUnit Conversion ● Optional.isEmpty() ● Pattern recognizing methods
- 7. Running file with single command 01 ● You do not have to compile the program to run it, you can simply go ahead and run the program without a hiccup. ● How does it happen? It compiles implicitly. This feature comes under JEP 330.
- 8. Lambda Params 01 JDK 11 allows ‘var’ to be used in lambda expressions. var list = new ArrayList<String>();
- 9. 01 Limitations of this feature:- You either define the type var on all the parameter or none (var a, var b) -> a+b // would do (var a, b) -> a + b // would not do (var a, String name) -> a + name // mixing not allowed Var a -> a // you have to use the parentheses
- 10. File Methods 01 Three methods introduced in the file handling:- ● writeString() ● readString() ● isSameFile()
- 11. JEP 321: HTTP Client It can be used to request HTTP resources over the network. This new API is a kind of built around three main classes ● HttpClient ● HttpRequest ● HttpResponse
- 12. Utility functions in String class 01 As part of Java 11, 4 new string functions were introduced:- ● isBlank() ● lines() ● strip(), stripLeading(), stripTrailing() ● repeat(int value)
- 13. Nested Based Access Control Basically, the nest term defines a new access control context that allows classes that are logically part of the same code entity, but which are compiled with distinct class files, to access each other's private members without the need for compilers to insert accessibility-broadening bridge methods.
- 14. TimeUnit Conversion 01 This method convert is used to convert the given time to a unit like DAY, HOURS, MINUTES and for time too. jshell>TimeUnit c = TimeUnit.DAYS; Output: DAYS jshell>c.convert(Duration.ofHours(24)); Output: 1
- 15. Optional.isEmpty() 01 This method returns false if the value of any optional object is empty and else returns true. jshell> Optional<String> name = Optional.of("Deepak"); name ==> Optional[Deepak] jshell> name.isEmpty(); $4 ==> false
- 16. jshell> Optional<String> name1 = Optional.empty(); name1 ==> Optional.empty jshell> name1.isEmpty(); $6 ==> true
- 17. Pattern recognizing methods 01 asMatchPredicate() - This method will create a predicate if pattern matches with input string. jshell> var pattern = Pattern.compile("deep").asMatchPredicate(); pattern ==> java.util.regex.Pattern$$Lambda$17/0x00000008000b6c40@5abca1 e0
- 18. Removed Features 01 ● Removal of com.sun.awt.AWTUtilities Class ● Removal of appletviewer Launcher ● Removal of Thread.destroy() and Thread.stop(Throwable) Methods ● Removal of JVM-MANAGEMENT-MIB.mib ● Removal of Java Deployment Technologies ● Removal of JavaFX from the Oracle JDK ● JEP 320 Remove the Java EE and CORBA Modules
- 19. Deprecated Features 01 ● ThreadPoolExecutor Should Not Specify a Dependency on Finalization ● JEP 335 Deprecate the Nashorn JavaScript Engine ● Deprecate -XX+AggressiveOpts ● Obsolete Support for Commercial Features ● Deprecate Stream-Based GSSContext Methods ● JEP 336 Deprecate the Pack200 Tools and API
- 20. Migration to Java 11 01 Here are the recommended minimum versions for a few tools: IntelliJ IDEA: 2018.2 Eclipse: Photon 4.9RC2 with Java 11 plugin Maven: 3.5.0 compiler plugin: 3.8.0 surefire and failsafe: 2.22.0 Gradle: 5.0
- 21. 01 Demo
- 22. References 01 ● https://docs.oracle.com/en/java/javase/11/ ● https://www.oracle.com/java/technologies/javase-jdk11-download s.html ● https://www.geeksforgeeks.org/java-11-features-and-comparison/ ● https://www.journaldev.com/24601/java-11-features ● https://blog.knoldus.com/string-functions-in-java-11/
- 23. Do remember to submit feedback!
- 24. Thank You !