😰 🤚🏻 👨🏾‍🤝‍👨🏻 Java8-15のすべてのJavaおよびJVM機能の体系化されたリスト 🍍 💝 😽

最終更新日： 2020年9月29日、への変更など、 JDK 15 。

バージョン8のリリースからバージョン15まで、Javaは163のJDK拡張プロポーザル（JEP）を生成し、それぞれがプラットフォームにいくつかの改善をもたらしました。このページは、最も重要な改善点の体系的 で 注意深く厳選されたリストです。

コンテンツ

新しい言語機能
新しいAPI
-
Javadoc

JEP - OpenJDK jdk jdk9 .

, , :

, . , . .
. .
API .

Java 8 , . , .

, . . , Java 8 .

JDK 15 ( JDK 14 JDK 13 )

String html = """
            <html>
                <body>
                    <p>Hello, world</p>
                </body>
            </html>
            """;

(Sealed) , ( )

JDK 15

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 )
JDK 15 JDK 14
```
record Point(int x, int y) { }
```

instanceof ( )

JDK 15 JDK 14

if (obj instanceof String s) {
    System.out.println("obj is a String and it' length is " + s.length());
}

Switch

JDK 14 ( JDK 12 JDK 13)

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:+ShowCodeDetailsInExceptionMessages JDK 14 )

a.b.c.i = 99;
---
Exception in thread "main" java.lang.NullPointerException:
      Cannot read field "c" because "a.b" is null

var,
JDK 11 ( JDK 10 )
```
var greeting = "Hello World!";
```

, ClassDefNotFoundErrors API

JDK 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)
@SafeVargs private

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 14
Files.mismatch:

JDK 12
Collectors.teeing ,

JDK 12
: indent transform

JDK 12

HTTP- HTTP/2, WebSocket API

JDK 11 ( Incubator JDK 9 )

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, repeat strip

JDK 11

(Factory Methods) ,

JDK 9

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 9
CompletableFuture(-, )

JDK 9
( dropWhile, takeWhile) ( iterate, ofNullable) ; ( toUnmodifiableList);

JDK 9
Arrays.mismatch:

JDK 9
Stack-Walking API,

JDK 9
API (, , , , / ), ProcessBuilder

JDK 9
VarHandleAPI , , java.util.concurrent.atomic sun.misc.Unsafe , , .

JDK 9
(combinators) (lookup) MethodHandle

JDK 9
. @Deprecated forRemoval, .

JDK 9
OASIS Standard XML Catalog API XML

JDK 9
JDK XML Xerces 2.11.0

JDK 9
TIFF Image I/O Framework
JDK 9

Unicode 10.0, 27000 , 10 30

JDK 11 ( Unicode 8.0 JDK 9 )
java.util.Locale API , .

JDK 10
ResourceBundle UTF-8 ISO-8859-1

JDK 9
CLDR (Common Locale Data Repository)

JDK 9

, //

JDK 9
MultiResolutionImage DPI

JDK 9
HiDPI Windows Linux

JDK 9
GTK 3 Linux JavaFX, Swing AWT

JDK 9
Javadoc @beaninfo @BeanInfo Swing

JDK 9
GStreamer, JavaFX / Media, 1.4.4

JDK 9
ICU OpenType HarfBuzz

JDK 9

API ( )

JDK 15 JDK 14
Java-

JDK 13
Java.

JDK 10
, " "

JDK 12
, Latin-1

JDK 9
,

JDK 9
(Interned)

JDK 9

java.lang.Math sin, cos log AArch64

JDK 11
Security Manager

JDK 9
Spin-Wait Hint ( Thread#onSpinWait) «-»

JDK 9
Marlin Renderer Java 2D Pisces

JDK 9
GHASH RSA SPARC Intel x64

JDK 9.

Thread-Local Handshakes ( )

JDK 10
JDK 9
, java.util.concurrent

JDK 9

Linux ( )

JDK 10 (Graal JIT-) JDK 9 ( JVM-) JDK 9 (Graal AoT-)
javac:

JDK 9

G1 ( )

NUMA

JDK 14
JDK 12
JDK 12
JDK 10
G1 Parallel GC

JDK 9

Z Garbage Collector,

JDK 15 ( JDK 14 (Windows) JDK 14 (OS X) JDK 11 (Linux))
Shenandoah, , ZGC,

JDK 15 ( JDK 12)
Epsilon, ,

JDK 11
XX:AllocateHeapAt=<path>

JDK 10

Flight Recorder: API ,

JDK 14
Microbenchmark Suite JMH

JDK 12
Flight Recorder OpenJDK

JDK 11
JMTI

JDK 11
C1 C2,

JDK 9
, JVM

JDK 9 ( JVM) JDK 9 ( )
JDK 9

(CA) JDK, TLS

JDK 10
JDK 9
- PKCS12 JKS

JDK 9.
DRBGSecureRandom

JDK 9
X.509 SHA-1

JDK 9
- SHA-3

JDK 9

TLS

TLS 1.3

JDK 11
Datagram Transport Layer Security (DTLS) API

JDK 9
OCSP TLS

JDK 9
TLS Application-Layer Protocol Negotiation (ALPN) Extension, ; ALPN HTTP/ 2

JDK 9

(EdDSA) - RFC8032

JDK 15
Curve25519 Curve448

JDK 11
ChaCha20 Poly1305

JDK 11

, shebang(#!) Unix

JDK 11
jshell: Java REPL

JDK 9 (Project Kulla)

→ : JShell
--release, --source --target

JDK 9
JVM

JDK 9

Packaging Tool, : msi, exe, pkg, dmg, deb rpm ( Incubator )

JDK 14
jlink Java, Java, JDK

JDK 9 - [ 2 ], [ 3 ], [ 4 ], [ 4 ], [ 5 ]
JAR , Java

JDK 9

Javadoc

Javadoc HTML5 ,
JDK 9 - [ 2 ], [ 3 ]

-

Unsafe::defineAnonymousClass() Lookup::defineHiddenClass(), , , .
JDK 15
java.lang.invoke.constant, ( ldc), ,

JDK 12
CONSTANT_Dynamic , , INVOKEDYNAMIC

JDK 11
Nest, - , - -.

JDK 11
-, , invokedynamic StringBuilder#append . -.

JDK 9
INVOKEDYNAMIC /

JDK 9

Linux / AArch64

JDK 9
Linux / s390x

JDK 9
Unified arm32/arm64

JDK 9

.
JDK 9 JDK 10

Nashorn Javascript Engine jjs

JDK 15 ( JDK 11 )
Solaris SPARC

JDK 15 ( JDK 14 )
RMI Activation ( RMI), java.rmi.activation rmid, Java RMI

JDK 15
Biased Locking ( ) ,

JDK 15
Unsafe::defineAnonymousClass()

JDK 15
Concurrent Mark Sweep (CMS)

JDK 14
ParallelScavenge + SerialOld GC

JDK 14
Pack200 API

JDK 14
Pack200 API

JDK 11
Java EE

JDK 11
CORBA

JDK 11
Thread#destroy Thread#stop

JDK 11
var

JDK 10
javah

JDK 10
JDK 9
API ( sun.*)

JDK 9 [ 2 ]
apple.applescript com.apple

JDK 9
X.509 SHA-1

JDK 9
JRE : JRE-Version -version: cli

JDK 9
jhat

JDK 9
JVM TI hprof Agent

JDK 9
GC, JDK 8

JDK 9
ResourceBundle UTF-8 ISO-8859-1

JDK 9
API

JDK 9
Concurrent Mark Sweep Garbage Collector

JDK 9
Object.finalize()

JDK 9
( lib/endorsed) ( lib/ext) JRE

JDK 9
rt.jar JRE

JDK 9

API Java 8 14, Java Almanac . jdeps, Java, , API.

JDK8 は2014年にリリースされました。JDK9を 3年半待たなければなりませんでした。しかし、それ以来、物事はより速く進んでいます。Javaには、6か月ごとに新しいバージョンをリリースすることを目的とした新しいリリース構造があります。

Java 8は引き続きサポートされていますが、最新バージョンにアップグレードすると、テーブルに大幅な改善がもたらされます。

Java8-15のすべてのJavaおよびJVM機能の体系化されたリスト

API

G1 ( )

TLS

Javadoc

-

More articles: