De Java 8 a Java 17
1 like2,133 views
This document summarizes the major changes and new features introduced in each version of Java from Java 8 to Java 17. It discusses key enhancements like modules in Java 9, switch expressions in Java 12, text blocks in Java 13, records and pattern matching in Java 14, sealed classes in Java 15 and strong encapsulation in Java 16. It also provides code examples to illustrate many of the new Java features.
![JEP 286: Local-Variable Type Inference
1 public static void main(String args[]){
2 var localValue = 99;
3 System.out.println(++localValue);
4 //localValue = "Foo"
5 }
18](https://image.slidesharecdn.com/main-211006153852/85/De-Java-8-a-Java-17-22-320.jpg)
![325: Switch Expressions (Preview)
Antes
1 String langType = "";
2 switch (args[0]) {
3 case "Java":
4 case "Scala":
5 case "Kotlin":
6 langType = "Static typed";
7 break;
8 case "Groovy":
9 case "JavaScript":
10 langType = "Dynamic typed";
11 break;
12 }
13 System.out.println(langType);
28](https://image.slidesharecdn.com/main-211006153852/85/De-Java-8-a-Java-17-34-320.jpg)
![325: Switch Expressions (Preview)
Ahora
1 String langType = switch (args[0]) {
2 case "Java", "Scala", "Kotlin" -> "Static typed";
3 case "Groovy", "JavaScript" -> "Dynamic typed";
4 default -> {
5 System.out.println("This meant to be a processing
block");
6 yield "Probably LISP :)";
7 }
8 };
9 System.out.println(langType);
29](https://image.slidesharecdn.com/main-211006153852/85/De-Java-8-a-Java-17-35-320.jpg)
De Java 8 a Java 17
- 1. Desde Java 8 hasta Java 17 Víctor Orozco - @tuxtor 5 de octubre de 2021 Nabenik 1
- 2. ¿Como se hace Java? De Java 8 hasta Java 17 Java 9 Java 10 Java 11 Java 12 Java 13 Java 14 Java 15 Java 16 Java 17 2
- 3. ¿Como se hace Java?
- 4. ¿Java? • Lenguaje • VM • Bibliotecas/API El conjunto es la plataforma Java (TM) 3
- 5. ¿Como se actualiza Java? • JCP - Java Community Process • JSR - Java Specification Request • JEP - Java Enhancement Proposal • JCK - Java Compatibility Kit 4
- 6. ¿Como se actualiza Java? - Java Enhancement Proposal 5
- 7. ¿Como se actualiza Java? - Java Compatibility Kit 6
- 8. Distros 7
- 9. De Java 8 hasta Java 17
- 10. ¿Que versión de Java se usa más en Guatemala? Java 8 https://guatejug.github.io/jvm2021/ 8
- 11. ¿Que recibo con cada versión nueva de Java? • Java - Lenguaje • Java - Bibliotecas e APIs • Java - Maquina Virtual de Java Mejoras de tipo • Incubation • Preview (–flag) • Definitiva 9
- 12. Java - Las mejoras que resaltan • Java 9 • Modulos • JShell • HTTP/2 • Factory methods • Java 10 • Type Inference • Class Data Sharing • Time based release • Java 11 • String methods • File methods • Direct .java execution • Java 12 • Switch expressions • Java 13 • Text blocks • Java 14 • Pattern matching • Records • Helpfull NPE 10
- 13. Java - Las mejoras que resaltan • Java 15 • Sealed classes • Nashorn removal • SPARC/Solaris removal • Java 16 • Vector API (Incubator) • C++ 14 • Records • Java 17 • MacOS Metal • Strong encapsulation • Switch expression + pattern matching • AOT removal • Applet deprecation 11
- 14. Java 9
- 15. JEP 222: jshell: The Java Shell (Read-Eval-Print Loop) 12
- 16. JEP 110: HTTP/2 Client 1 HttpRequest request = HttpRequest.newBuilder() 2 .uri(new URI("https://swapi.co/api/starships/9")) 3 .GET() 4 .build(); 5 6 HttpResponse<String> response = HttpClient.newHttpClient() 7 .send(request, BodyHandlers.ofString()); 8 9 System.out.println(response.body()); 13
- 17. JEP 269: Convenience Factory Methods for Collections Antes 1 Set<String> set = new HashSet<>(); 2 set.add("a"); 3 set.add("b"); 4 set.add("c"); 5 set = Collections.unmodifiableSet(set); ”Pro” 1 Set<String> set = Collections.unmodifiableSet(new HashSet<>( Arrays.asList("a", "b", "c"))); Ahora 1 Set<String> set = Set.of("a", "b", "c"); 14
- 18. JEP 213: Milling Project Coin - Private methods in interfaces Antes 1 public interface Vehicle{ 2 public void move(); 3 } Ahora 1 public interface Vehicle{ 2 public default void makeNoise(){ 3 System.out.println("Making noise!"); 4 createNoise(); 5 } 6 7 private void createNoise(){ 8 System.out.println("Run run"); 9 } 10 } 15
- 19. JEP 213: Milling Project Coin - Try-with-resources Antes 1 BufferedReader reader = new BufferedReader(new FileReader(" langs.txt")); 2 3 try(BufferedReader innerReader = reader){ 4 System.out.println(reader.readLine()); 5 } Ahora 1 BufferedReader reader = new BufferedReader(new FileReader(" langs.txt")); 2 3 try(reader){ 4 System.out.println(reader.readLine()); 5 } 16
- 20. Java 10
- 21. Java 10 286: Local-Variable Type Inference 296: Consolidate the JDK Forest into a Single Repository 304: Garbage-Collector Interface 307: Parallel Full GC for G1 310: Application Class-Data Sharing 312: Thread-Local Handshakes 313: Remove the Native-Header Generation Tool (javah) 314: Additional Unicode Language-Tag Extensions 316: Heap Allocation on Alternative Memory Devices 317: Experimental Java-Based JIT Compiler 319: Root Certificates 322: Time-Based Release Versioning 17
- 22. JEP 286: Local-Variable Type Inference 1 public static void main(String args[]){ 2 var localValue = 99; 3 System.out.println(++localValue); 4 //localValue = "Foo" 5 } 18
- 23. JEP 310: Application Class-Data Sharing 1 java −XX:+UseAppCDS −XX : DumpLoadedClassList=classes . l s t − j a r demo−microservicio − ee−microbundle . j a r 2 java −XX:+UseAppCDS −Xshare :dump −XX : SharedClassListFile =classes . l s t −XX : SharedArchiveFile=app−cds . jsa demo−microservicio −ee−microbundle . j a r 3 java −XX:+UseAppCDS −Xshare : on −XX : SharedArchiveFile=app−cds . jsa − j a r demo− microservicio −ee−microbundle . j a r 19
- 24. JEP 310: Application Class-Data Sharing 20
- 25. JEP 310: Application Class-Data Sharing 21
- 26. JEP 322: Time-Based Release Versioning 22
- 27. JEP 322: Time-Based Release Versioning 23
- 28. Java 11
- 29. Java 11 181: Nest-Based Access Control 309: Dynamic Class-File Constants 315: Improve Aarch64 Intrinsics 318: Epsilon: A No-Op Garbage Collector 320: Remove the Java EE and CORBA Modules 321: HTTP Client (Standard) 323: Local-Variable Syntax for Lambda Parameters 324: Key Agreement with Curve25519 and Curve448 327: Unicode 10 328: Flight Recorder 329: ChaCha20 and Poly1305 Cryptographic Algorithms 330: Launch Single-File Source-Code Programs 331: Low-Overhead Heap Profiling 332: Transport Layer Security (TLS) 1.3 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental) 335: Deprecate the Nashorn JavaScript Engine 336: Deprecate the Pack200 Tools and API 24
- 30. JEP 323: Local-Variable Syntax for Lambda Parameters Antes 1 BiPredicate<String,String> demoPredicate = 2 (String a, String b) -> a.equals(b); 3 BiPredicate<String,String> demoPredicate = 4 (a, b) -> a.equals(b); Ahora 1 BiPredicate<String,String> demoPredicate = 2 (var a, var b) -> a.equals(b); Posibilidades 1 (@Nonnull var x, @Nullable var y) -> x.process(y) 25
- 31. JEP 330: Launch Single-File Source-Code Programs 26
- 32. Java 12
- 33. Java 12 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental) 230: Microbenchmark Suite 325: Switch Expressions (Preview) 334: JVM Constants API 340: One AArch64 Port, Not Two 341: Default CDS Archives 344: Abortable Mixed Collections for G1 346: Promptly Return Unused Committed Memory from G1 27
- 34. 325: Switch Expressions (Preview) Antes 1 String langType = ""; 2 switch (args[0]) { 3 case "Java": 4 case "Scala": 5 case "Kotlin": 6 langType = "Static typed"; 7 break; 8 case "Groovy": 9 case "JavaScript": 10 langType = "Dynamic typed"; 11 break; 12 } 13 System.out.println(langType); 28
- 35. 325: Switch Expressions (Preview) Ahora 1 String langType = switch (args[0]) { 2 case "Java", "Scala", "Kotlin" -> "Static typed"; 3 case "Groovy", "JavaScript" -> "Dynamic typed"; 4 default -> { 5 System.out.println("This meant to be a processing block"); 6 yield "Probably LISP :)"; 7 } 8 }; 9 System.out.println(langType); 29
- 36. Java 13
- 37. Java 13 350: Dynamic CDS Archives 351: ZGC: Uncommit Unused Memory 353: Reimplement the Legacy Socket API 354: Switch Expressions (Preview) 355: Text Blocks (Preview) 30
- 38. 355: Text Blocks (Preview) Antes 1 String html = "<html>n" + 2 " <body>n" + 3 " <p>Hello, world</p>n" + 4 " </body>n" + 5 "</html>n"; Ahora 1 String html = """ 2 <html> 3 <body> 4 <p>Hello, world</p> 5 </body> 6 </html> 7 """; 31
- 39. Java 14
- 40. Java 14 305: Pattern Matching for instanceof (Preview) 343: Packaging Tool (Incubator) 345: NUMA-Aware Memory Allocation for G1 349: JFR Event Streaming 352: Non-Volatile Mapped Byte Buffers 358: Helpful NullPointerExceptions 359: Records (Preview) 361: Switch Expressions (Standard) 362: Deprecate the Solaris and SPARC Ports 363: Remove the Concurrent Mark Sweep (CMS) Garbage Collector 364: ZGC on macOS 365: ZGC on Windows 366: Deprecate the ParallelScavenge + SerialOld GC Combination 367: Remove the Pack200 Tools and API 368: Text Blocks (Second Preview) 370: Foreign-Memory Access API (Incubator) 32
- 41. JEP 359: Records (Preview) Data carrier 1 record Person(String name, String email, int age) {} Uso 1 Person foo = new Person("Marco", "[email protected]",99); 2 System.out.println(foo); 3 //foo.name = "Polo"; 33
- 42. 305: Pattern Matching for instanceof (Preview) Antes 1 if(o instanceof Person){ 2 Person p = (Person)o; 3 System.out.println("Hello " + p.name()); 4 }else{ 5 System.out.println("Unknown object"); 6 } Ahora 1 if(o instanceof Person p){ 2 System.out.println("Hello " + p.name()); 3 }else{ 4 System.out.println("Unknown object"); 5 } 34
- 43. Java 15
- 44. Java 15 339: Addition of EdDSA (Edwards-Curve Digital Signature Algorithm) 360: Preview for sealed classes 371: Addition of hidden classes in Java 372: Removal of the Nashorn JavaScript Engine 373: Legacy DatagramSocket API reimplementation 374: Biased locking disablement and deprecation 375: Second preview for instanceof pattern matching 377: Addition of ZGC, the scalable, low-latency, garbage collector for Java 378: Full inclusion of Java Text Blocks 379: Addition and enhancements of the low-pause time Shenandoah garbage collector 381: Final remove of Solaris and SPARC Ports 383: Incubation of the Foreign-Memory Access API 384: Second preview inclusion of Java Records 385: RMI Activation deprecation with the goal of future removal 35
- 45. 360: Sealed Classes (Preview) Antes 1 public class Animal { ... } 2 3 public class Porsche extends Animal { ... } Ahora 1 public abstract sealed class Animal 2 permits Dog, Cat, Wolf { ... } 36
- 46. 360: Sealed Classes (Preview) Antes 1 public class Animal { ... } 2 3 public class Porsche extends Animal { ... } Pro 1 abstract sealed class Animal { 2 final class Dog extends Root { ... } 3 final class Cat extends Root { ... } 4 final class Wolf extends Root { ... } 5 ... } 37
- 47. 371: Hidden Classes Antes 1 ClassLoader::defineClass Ahora 1 Lookup::defineHiddenClass 38
- 48. 381: Remove the Solaris and SPARC Ports 39
- 49. 383: Foreign-Memory Access API (Second Incubator) 1 VarHandle intHandle = MemoryHandles.varHandle(int.class, 2 ByteOrder.nativeOrder()); 3 4 try (MemorySegment segment = MemorySegment.allocateNative(100) ) { 5 for (int i = 0; i < 25; i++) { 6 intHandle.set(segment, i * 4, i); 7 } 8 ... 40
- 50. Java 16
- 51. Java 16 338: Incubation of the Vector API 347: C++14 language features enablement 357: Migration from Mercurial to Git 369: GitHub migration of OpenJDK repositories 376: Concurrent thread-stack processing for ZGC 380: Unix-Domain Socket Channels 386: Alpine Linux port 387: Support for elastic metaspace 388: The Windows AArch64 Port 389: Incubation of the Foreign Linker API 390: Value-based classes warnings 392: Addition of the Packaging Tool 393: Third incubation of the Foreign-Memory Access API 394: Full inclusion of pattern matching for instanceof 395: Full implementation of Java Records 396: Strongly encapsulation of JDK Internals 397: Second preview of sealed classes 41
- 52. 386: Alpine Linux Port 42
- 53. 389: Foreign Linker API (Incubator) 1 LibraryLookup libclang = LibraryLookup.ofLibrary("clang"); 2 LibraryLookup.Symbol clangVersion = libclang.lookup(" clang_getClangVersion"); 43
- 54. 396: Strongly Encapsulate JDK Internals by Default Antes 1 --illegal-access=permit Ahora 1 --illegal-access=deny 44
- 55. Java 17
- 56. Java 17 306: Restoration of always-strict semantics for floating-points 356: Pseudo-random number generators improvements 382: Support for a new macOS pipeline for rendering 391: The macOS AArch64 port 398: Deprecation of the infamous Applet API with the goal of full removal 403: Strong encapsulation of Java’s internals 406: Switch pattern matching preview 407: RMI Activation removal 409: Full support for sealed Java classes 410: Removal of the experimental and largely unused ahead-of-time (AOT) and just-in-time (JIT) compilers 411: Deprecation of the Security Manager with removal being the eventual goal 412: Incubation of the Foreign Function & Memory API 414: Second incubation of the Vector API 415: Context-specific deserialization filters 45
- 57. 406: Pattern Matching for switch (Preview) 1 static void testTriangle(Shape s) { 2 switch (s) { 3 case Triangle t && (t.calculateArea() > 100) -> 4 System.out.println("Large triangle"); 5 case Square s -> 6 System.out.println("Is not a triangle is a square" ); 7 default -> 8 System.out.println("Non-triangle"); 9 } 10 } 46
- 58. Nueva licencia Oracle Java 17 47
- 59. JEPs in JDK 17 integrated since JDK 11 https://openjdk.java.net/projects/jdk/17/jeps-since-jdk-11 48
- 60. Víctor Orozco • [email protected] • @tuxtor • http://vorozco.com • http://tuxtor.shekalug.org This work is licensed under Creative Commons Attribution- NonCommercial-ShareAlike 3.0 Guatemala (CC BY-NC-SA 3.0 GT). 49