Last update: 09/29/2020, including changes to JDK 15 .
From the release of version 8 to version 15, Java has generated 163 JDK Extension Proposals (JEPs), each of which brings some improvements to the platform. This page is a systematic and carefully curated list of the most important improvements.
Content
New language features
New API
Performance improvements
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Javadoc
, , :
Java 8 , . , .
, . . , Java 8 .
String html = """ <html> <body> <p>Hello, world</p> </body> </html> """;(Sealed) , ( )
public abstract sealed class Shape permits Circle, Rectangle {...} public class Circle extends Shape {...} // OK public class Rectangle extends Shape {...} // OK public class Triangle extends Shape {...} // Compile error // No need for default case if all permitted types are covered double area = switch (shape) { case Circle c -> Math.pow(c.radius(), 2) * Math.PI case Rectangle r -> r.a() * r.b() };(Records )
record Point(int x, int y) { }instanceof ( )
if (obj instanceof String s) { System.out.println("obj is a String and it' length is " + s.length()); }Switch
int numLetters = switch (day) { case MONDAY, FRIDAY, SUNDAY -> 6; case TUESDAY -> 7; default -> { String s = day.toString(); int result = s.length(); yield result; } };NullPointerExceptions, , null
JDK 15 (
-XX:+ShowCodeDetailsInExceptionMessagesJDK 14 )a.b.c.i = 99; --- Exception in thread "main" java.lang.NullPointerException: Cannot read field "c" because "a.b" is nullvar,var greeting = "Hello World!";,
ClassDefNotFoundErrorsAPIJDK 9 (Project Jigsaw)
module hu.advancedweb.helloworld { requires hu.advancedweb.somedependency; exports hu.advancedweb.hello }
JDK 9 ( Milling Coin)Diamond
JDK 9 ( Milling Coin)Try-with-resources, final
JDK 9 ( Milling Coin)@SafeVargsprivate
JDK 9 ( Milling Coin)import
JDK 9
API
Java, , .
API Java 8 14, AdoptOpenJDK / jdk-api-diff GitHub .
(Non-Volatile Mapped Byte Buffers) API- FileChannel
JDK 14Files.mismatch:
JDK 12Collectors.teeing,
JDK 12:
indenttransform
JDK 12HTTP- HTTP/2, WebSocket API
HttpClient httpClient = HttpClient.newBuilder().build(); HttpRequest request = HttpRequest.newBuilder() .uri(URI.create("https://advancedweb.hu/")) .GET() .build(); HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());- :
isBlank,lines,repeatstrip
JDK 11(Factory Methods) ,
Set<Integer> mySet = Set.of(1, 2, 3); List<Integer> myList = List.of(1, 2, 3); Map<String, Integer> myMap = Map.of("one", 1, "two", 2);Reactive Streams, - « » (backpressure)1
JDK 9CompletableFuture(-, )
JDK 9(
dropWhile,takeWhile) (iterate,ofNullable) ; (toUnmodifiableList);
JDK 9Arrays.mismatch:
JDK 9Stack-Walking API,
JDK 9API (, , , , / ),
ProcessBuilder
JDK 9VarHandleAPI , ,java.util.concurrent.atomicsun.misc.Unsafe, , .
JDK 9(combinators) (lookup)
MethodHandle
JDK 9.
@DeprecatedforRemoval, .
JDK 9OASIS Standard XML Catalog API XML
JDK 9JDK XML Xerces 2.11.0
JDK 9TIFF Image I/O Framework
java.util.LocaleAPI , .
JDK 10ResourceBundleUTF-8 ISO-8859-1
JDK 9CLDR (Common Locale Data Repository)
JDK 9
, //
JDK 9MultiResolutionImageDPI
JDK 9HiDPI Windows Linux
JDK 9GTK 3 Linux JavaFX, Swing AWT
JDK 9Javadoc
@beaninfo@BeanInfoSwing
JDK 9GStreamer, JavaFX / Media, 1.4.4
JDK 9ICU OpenType HarfBuzz
JDK 9
java.lang.Mathsin,coslogAArch64
JDK 11Security Manager
JDK 9Spin-Wait Hint (
Thread#onSpinWait) «-»
JDK 9Marlin Renderer Java 2D Pisces
JDK 9GHASH RSA SPARC Intel x64
JDK 9.
G1 ( )
Z Garbage Collector,
JDK 15 ( JDK 14 (Windows) JDK 14 (OS X) JDK 11 (Linux))Epsilon, ,
JDK 11XX:AllocateHeapAt=<path>
JDK 10
TLS
TLS 1.3
JDK 11Datagram Transport Layer Security (DTLS) API
JDK 9OCSP TLS
JDK 9TLS Application-Layer Protocol Negotiation (ALPN) Extension, ; ALPN HTTP/ 2
JDK 9
Packaging Tool, : msi, exe, pkg, dmg, deb rpm ( Incubator )
JDK 14jlinkJava, Java, JDK
JDK 9 - [ 2 ], [ 3 ], [ 4 ], [ 4 ], [ 5 ]JAR , Java
JDK 9
Javadoc
-
Unsafe::defineAnonymousClass()Lookup::defineHiddenClass(), , , .java.lang.invoke.constant, (ldc), ,
JDK 12CONSTANT_Dynamic, ,INVOKEDYNAMIC
JDK 11Nest, - , - -.
JDK 11-, ,
invokedynamicStringBuilder#append. -.
JDK 9INVOKEDYNAMIC/
JDK 9
RMI Activation ( RMI),
java.rmi.activationrmid, Java RMI
JDK 15Biased Locking ( ) ,
JDK 15Unsafe::defineAnonymousClass()
JDK 15Concurrent Mark Sweep (CMS)
JDK 14ParallelScavenge + SerialOld GC
JDK 14Pack200 API
JDK 14Pack200 API
JDK 11Java EE
JDK 11CORBA
JDK 11Thread#destroyThread#stop
JDK 11var
JDK 10javah
JDK 10apple.applescriptcom.apple
JDK 9X.509 SHA-1
JDK 9JRE :
JRE-Version-version:cli
JDK 9jhat
JDK 9JVM TI hprof Agent
JDK 9GC, JDK 8
JDK 9ResourceBundle UTF-8 ISO-8859-1
JDK 9API
JDK 9Concurrent Mark Sweep Garbage Collector
JDK 9Object.finalize()
JDK 9(
lib/endorsed) (lib/ext) JRE
JDK 9rt.jarJRE
JDK 9
API Java 8 14, Java Almanac . jdeps, Java, , API.
JDK 8 was released in 2014. We had to wait for JDK 9 for three and a half years. But things have gone faster since then. Java has a new release structure that aims to release a new version every six months.
While Java 8 is still supported, upgrading to the latest version brings a significant number of improvements to the table.