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Youth Ministry

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Aiden Jones
Aiden Jones

JDK 15: The New Features In Java 15

  • Removes the Nashorn JavaScript script engine, the APIs and the jjs tool as mentioned below as it was already deprecated in java 11. jdk.scripting.nashorn : It contains the jdk.nashorn.api.scripting and jdk.nashorn.api.tree packages.

  • : It contains the jjs tool.

JDK 15: The new features in Java 15


  • Quick glance on earlier Java Versions Features : Java 14 Features - JDK 14 Java 14 (Java SE 14) and its Java Development Kit 14 (JDK 14) open-source has been released on 17 March 2020, the most common coding language and application platform in the world. A significant number of Java Enhancement Proposals (JEPs) have been released in version 14. (Even more JEPs than Java 12 and 13 combined) JAVA 14 addresses a total of 16 main enhancements/changes (JEPs) ranging from the Java language support to the latest APIs for ongoing JDK flight recorder monitoring. The entire feature list consists of: Pattern Matching for instanceof

  • Non-Volatile Mapped Byte Buffers

  • Helpful NullPointerExceptions

  • Switch Expressions (Standard)

  • Packaging Tool (Incubator)

  • NUMA-Aware Memory Allocation for G1

  • JFR Event Streaming

  • Records (Preview)

  • Deprecate the Solaris and SPARC Ports

  • Remove the Concurrent Mark Sweep (CMS) Garbage Collector

  • ZGC on macOS

  • ZGC on Windows

  • Deprecate the ParallelScavenge + SerialOld GC Combination

  • Remove the Pack200 Tools and API

  • Text Blocks (Second Preview)

  • Foreign-Memory Access API

  • Java 13 Features - JDK 13 Dynamic CDS Archives

  • ZGC: Uncommit Unused Memory

  • Reimplement the Legacy Socket API

  • Switch Expressions (Preview)

  • Text Blocks (Preview)

  • 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 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

  • 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

Michael Rasmussen is a product manager for JRebel by Perforce, previously having worked more than 10 years on the core technology behind JRebel. Michael is a true geek at heart. His professional interests include everything Java, as well as other languages and technologies for the JVM, including an unhealthy obsession with java bytecode.

If you implement your own accessor methods, then ensure that they have the same characteristics as implicitly derived accessors (for example, they're declared public and have the same return type as the corresponding record class component). Similarly, if you implement your own versions of the equals, hashCode, and toString methods, then ensure that they have the same characteristics and behavior as those in the java.lang.Record class, which is the common superclass of all record classes.

You might get a compiler error if your source file imports a class named Record from a package other than java.lang. A Java source file automatically imports all the types in the java.lang package though an implicit import java.lang.*; statement. This includes the java.lang.Record class, regardless of whether preview features are enabled or disabled.

Both Record in the com.myapp package and Record in the java.lang package are imported with a wildcard. Consequently, neither class takes precedence, and the compiler generates an error when it encounters the use of the simple name Record.

To compile source code with javac that uses preview features from JDK release n, use javac from JDK release n with the --enable-preview command-line option in conjunction with either the --release n or -source n command-line option.

To run an application that uses preview features from JDK release n, use java from JDK release n with the --enable-preview option. To continue the previous example, to run MyApp, run java from JDK 12 as follows:

JDK 15 features released on 15th Sept, 2020. After 25 years of innovation, Java continues to be the #1 programming language, used by over 69 percent of full-time developers worldwide. The latest Java Development Kit (JDK) delivers new functionalities to improve developer productivity & security. As a developer, we should have knowledge of the features of new release, at least which may be important to our development part. JDK 15 features also may have an important role in the java technical interview process. Not only JDK 15, but features of other previous versions also can play an important role in the interview. 041b061a72


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