Latest Java 20 : JDK 20 Arrived- What's new features in Java 20

The latest version of Java 20 (JDK 20) has released on 21 March 2023. The programming language known as Java has been around for more than 20 years and is very popular. With each successive release, the Java language gains new features and improvements to keep up with technological advancements. The most recent version of Java, known as JDK 20, comes with a number of new features and enhancements. In this post, we'll examine some of JDK 20's most prominent features and provide examples.

Java 20 release date :

21 March 2023

Java 20 Download :

Java 20 JDK

Java 20 has below features coming out as part of the JDK 20:

JEP 433: Pattern Matching for switch (Fourth Preview)

With the help of a new feature in JDK 20, developers may now more easily write code that checks an object's type: pattern matching for instanceof. If a developer wished to carry out an operation based on the type of an object in a previous version of Java, they had to use an if-else statement or switch statement. This procedure is streamlined, for instance, using pattern matching. Here's an example:

public static void main(String[] args) {
   Object obj = "Hello, Java!";
   if (obj instanceof String s && s.length() > 0) {
      System.out.println("Non empty string!");
   }
}

The if statement in the example above determines whether the object is a String instance and whether the String's length is higher than 0. The statement "Non empty string!" is printed if both conditions are met.

JEP 434: Foreign Function & Memory API (Second Preview)

Java programmers are faced challenges with a choices when it comes to accessing off-heap data: Should they go the safe but ineffective way (ByteBuffer) or should they forgo safety in favour of performance (Unsafe)?

Java 19 has introduced an API that allows Java programmes to interact with code and data that is not part of the Java runtime. The API enables Java programmes to call native libraries and handle native data without the brittleness and danger of JNI by effectively executing foreign functions (i.e., code outside the JVM) and safely accessing foreign memory (i.e., memory not maintained by the JVM).

Ease of use - Use a superior, pure-Java programming approach instead of the Java Native Interface (JNI).
Performance - Offer performance that is on par with, if not superior to, that of currently available APIs like JNI and sun.misc.Unsafe.
Generality - Provide methods for operating on various types of foreign memory (e.g., native memory, persistent memory, and managed heap memory) as well as, in time, other platforms (e.g., 32-bit x86) and foreign functions written in languages other than C (e.g., C++, Fortran).
Safety - Permit programmes to execute risky operations on external memory, but by default, alert users about these activities.

JEP 432: Record Patterns (Second Preview)

Records, a new feature in JDK 20, offer a shortened method of declaring classes that are primarily used for data storage. Classes and records are similar, however records are shorter and more focused on data representation. Here's an example:

public record Employee(String name, int Id) {
   public Employee {
      if (Id < 0) {
         throw new IllegalArgumentException("Id can't have a negative.");
      }
   }
}

In the example above, a record with the name "Employee" and the fields "name" and "Id" was generated. A check to make sure the Id is not negative is included in the constructor for the record. The record can be created in the following ways:

Employee emp = new Employee("Robin", 25);

Java 19 JDK

Java 19 has below features coming out as part of the JDK 19:

Java 18 has below features coming out as part of the JDK 18:

JEP 408 : UTF-8 by Default

Set UTF-8 as the default charset for Java APIs. Except for terminal I/O, use UTF-8 across the regular Java APIs. As a result of this change, APIs that rely on the default charset will now behave consistently across all implementations, operating systems, locales, and configurations.

The default charset is determined when the Java runtime starts in JDK 17 and before. By making UTF-8 the default charset, there's a chance that programmes won't work properly with data produced when the new default charset isn't specified.Though risk is not new.

Developers are strongly encouraged to check for charset issues by starting the Java runtime with -Dfile.encoding=UTF-8 on their current JDK release (JDK 8-17).

On macOS and many linux distributions use UTF-8 as its default charset for several releases except when configured to use the Posix C locale, the proposal states. While On other operating systems, like Windows users in Asian and other locales upon the user's locale and the default encoding (windows-1252 or windows-31j) there may be significant risk.

JEP 400 : Simple Web Server

Provide an out-of-the-box static HTTP file server with limited functionality and quick setup. There is no CGI or servlet-like capabilities.

Provide a command-line default implementation as well as a tiny API for programmatic creation and customization.

We can use $ jwebserver command to starts the Simple Web Server, which allow few configuration through parameters like -b, -p, -d, -h etc

This tool will be particularly useful in educational contexts for prototyping, ad-hoc coding, and testing only not intended for commercial-grade server.

JEP 413: Code Snippets in Java API Documentation

With addition of a @snippet tag to JavaDoc's Standard Doclet to declare code fragments to appear in the generated documentation, insertion of example source code in API documentation become easier. Also improve IDE support for snippet creation and editing.

By giving API access to source code fragments, you may make it easier to validate them. Although the author is ultimately responsible for correctness, improved javadoc and related tools can make it easier to achieve.

Enable modern styling features like syntax highlighting and automated name-to-declaration linking.

JEP 416: Reimplement Core Reflection with Method Handles

With addition of a @snippet tag to JavaDoc's Standard Doclet, insertion of example source code in API documentation become easier. Also improve IDE support for snippet creation and editing.

Enable modern styling features like syntax highlighting and automated name-to-declaration linking.

Java 17 has released on 14 September 2022, you can checkout its features below :

Checkout Java 17 / JDK 17 Features :

Java 16 : JDK 16 Features

Java 17 is still in progress, so you can take a look at the latest Java version: Java 16 functionality upgrade to get an idea of what will be in JDK 17

The open-source Java 16 (Java SE 16) and Java Development Kit 16 (JDK 16) is released. The feature set has been frozen for the time being. There will be no more JEPs for this release; developers can start looking at JDK 16 now to get a sense of what's coming in JDK 16. Java 16 released on date : 16 March 2021

Some of the new feature highlights of JDK 16 includes concurrent thread-stack processing for garbage collection, support for C++ 14 language features, an "elastic metaspace" capability to more quickly return unused class metadata memory to the OS, procedural upgrades, new APIs and tooling, operating system ports, strongly encapsulating JDK internals by default, and many more..

Download : JDK 16 Release

JDK 16 is here, below features are part of jdk 16.

Java 16 has released on March 2021. This is not an LTS update and will become obsolete in September 2021 when Java 17 is released.

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Quick glance on earlier Java Versions Features :

Java 15 Features - JDK 15

JDK Enhancement Proposals (JEP) has now been officially released on 15 September 2020, listed below features/enhancements as part of the jdk 15 :

Java 14 Features - JDK 14

JDK Enhancement Proposals (JEP) has targeted JDK 14 release for 17 March 2020 for below features :

Java 13 Features - JDK 13

Java 12 Features

Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
Microbenchmark Suite
Switch Expressions (Preview)
JVM Constants API
One AArch64 Port, Not Two
Default CDS Archives
Abortable Mixed Collections
Promptly Return Unused Committed Memory from G1

Java 11 Features

Java 10 Features

Local-variable type inference
Experimental Java-based JIT compiler.This is the integration of the Graal dynamic compiler for the Linux x64 platform
Application class-data sharing. This allows application classes to be placed in the shared archive to reduce startup and footprint for Java applications
Time-based release versioning
Parallel full GC
Garbage-collector interface
Additional Unicode language-tag extensions
Root certificates
Thread-local handshakes
Heap allocation on alternative memory devices
Remove the native-header generation tool - javah
Consolidate the JDK forest into a single repository

Java 9 Features

Modularization of the JDK under Project Jigsaw (Java Platform Module System)
jshell: The Java Shell (a Java REPL)
Ahead-of-time compilation
XML catalogs
More concurrency updates. It includes a Java implementation of Reactive Streams, including a new Flow class that included the interfaces previously provided by Reactive Streams
Variable handles: define a standard means to invoke the equivalents of various java.util.concurrent.atomic and sun.misc.Unsafe operations
jlink: The Java Linker: create a tool that can assemble and optimize a set of modules and their dependencies into a custom run-time image. It effectively allows to produce a fully usable executable including the JVM to run it
JavaDB was removed from JDK
HiDPI graphics: automatic scaling and sizing

Java 8 Features

Language-level support for lambda expressions and default methods (virtual extension methods) which allow the addition of methods to interfaces without breaking existing implementations.
Project Nashorn, a JavaScript runtime which allows developers to embed JavaScript code within applications
Annotation on Java types
Unsigned integer arithmetic
Repeating annotations
Date and time API
Statically-linked JNI libraries
Launch JavaFX applications (direct launching of JavaFX application JARs)
Remove the permanent generation

Java 7 Features

JVM support for dynamic languages
Compressed 64-bit pointers
Strings in switch
Automatic resource management in try-statement
Improved type inference for generic instance creation, aka the diamond operator <>
Simplified varargs method declaration
Binary integer literals
Allowing underscores in numeric literals
Catching multiple exception types and rethrowing exceptions with improved type checking
Concurrency utilities
New file I/O library adding support for multiple file systems
Timsort is used to sort collections and arrays of objects instead of merge sort
Library-level support for elliptic curve cryptography algorithms
An XRender pipeline for Java 2D, which improves handling of features specific to modern GPUs
New platform APIs for the graphics features
Enhanced library-level support for new network protocols, including SCTP and Sockets Direct Protocol
Upstream updates to XML and Unicode
Java deployment rule sets

Java 6 Features

Support for older Win9x versions dropped
Scripting Language Support
Dramatic performance improvements for the core platform, and Swing.
Improved Web Service support through JAX-WS.
JDBC 4.0 support.
Java Compiler API
Upgrade of JAXB to version 2.0
Support for pluggable annotations
Many GUI improvements, such as integration of SwingWorker in the API, table sorting and filtering, and true Swing double-buffering (eliminating the gray-area effect).
JVM improvements include: synchronization and compiler performance optimizations, new algorithms and upgrades to existing garbage collection algorithms, and application start-up performance.
Java 6 can be installed to Mac OS X 10.5 (Leopard) running on 64-bit (Core 2 Duo and higher) processor machines.[54] Java 6 is also supported by both 32-bit and 64-bit machines running Mac OS X 10.6

Java 5 Features

Generic
Metadata
Autoboxing/unboxing
Enumerations
Varargs
Enhanced for each loop
Improved
Static imports
Improvements - Semantics of execution for multi-threaded Java programs
Improvements - Automatic stub generation for RMI objects
Improvements - Swing: New skinnable look and feel, called synth
Improvements - The concurrency utilities in package java.util.concurrent
Improvements - Scanner class for parsing data from various input streams and buffers

Latest Java 20 : JDK 20 Arrived- What's new features in Java 20

Java 20 release date :

Java 20 Download :

Java 20 has below features coming out as part of the JDK 20:

JEP 433: Pattern Matching for switch (Fourth Preview)

JEP 434: Foreign Function & Memory API (Second Preview)

JEP 432: Record Patterns (Second Preview)

Java 19 has below features coming out as part of the JDK 19:

Java 18 has below features coming out as part of the JDK 18:

JEP 408 : UTF-8 by Default

JEP 400 : Simple Web Server

JEP 413: Code Snippets in Java API Documentation

JEP 416: Reimplement Core Reflection with Method Handles

Java 17 has released on 14 September 2022, you can checkout its features below :

Java 16 : JDK 16 Features

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Java 15 Features - JDK 15

Java 14 Features - JDK 14

Java 13 Features - JDK 13

Java 12 Features

Java 11 Features

Java 10 Features

Java 9 Features

Java 8 Features

Java 7 Features

Java 6 Features

Java 5 Features

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