Java 18 Features
New Features in Java 18
Java 18 Features
Java 18, released in March 2022, introduced several notable features to enhance performance, developer convenience, and overall usability. Key enhancements include the introduction of a simple web server, which simplifies testing and prototyping; a new `Vector API` in an incubator phase that allows developers to express vector computations in a platform-agnostic way; the use of `Pattern Matching for `instanceof``, which simplifies type checking and casting; and the `Foreign Function & Memory API` in an incubator stage that enables more efficient interactions with native code. Additionally, Java 18 includes improvements to the `Javadoc` tool, enhancing the generation of documentation, and performance updates to the Java Virtual Machine. These features collectively aim to streamline Java development and extend its capabilities for modern applications.
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1 - Introduction of the `jdk.blockchain` package: Java 18 includes a new package that provides basic interfaces and classes for building applications that interact with blockchain technologies.
2) Simple Web Server: Java 18 introduces a simple command line tool that enables the execution of HTTP servers. This feature is handy for prototyping and testing web applications directly from the command line.
3) Code Snippets in Java Documentation: Java 18 supports code snippets in official documentation. It allows developers to create and validate code examples that are included in API docs, ensuring accuracy and relevance.
4) Pattern Matching for `switch` (Preview): Enhancements to the `switch` statement allow for more powerful and flexible pattern matching. It helps to simplify the code and makes it easier to manage complex conditional logic.
5) Vector API (Second Incubator): The Vector API provides a mechanism to express vector computations, enabling high performance development while allowing for runtime optimizations. This feature is still in the incubation stage.
6) Foreign Function & Memory API (Second Incubator): This API enables Java code to call native code and access native memory outside of the Java heap. It provides a safe and efficient way to interact with native systems, opening up new possibilities for performance.
7) JEP 408: UTF 8 by Default: Starting with Java 18, UTF 8 is the default charset for the JVM, ensuring consistent encoding across platforms and applications, which eliminates many common pitfalls related to character encoding.
8) JEP 421: Deprecated Finalization for Better Performance: This JEP deprecates the finalization mechanism in Java, which has been criticized for performance issues and potential unpredictability in resource management.
9) JEP 376: ZGC: Concurrent Post Thread Stack Processing: In this feature, improvements to the Z garbage collector support concurrent stack processing, reducing pauses in garbage collection and enhancing overall throughput.
10) JEP 387: Elastic Metaspace: This enhancement aims to improve the performance and memory footprint of the Metaspace area, focusing on reducing the memory overhead associated with large numbers of class definitions.
11) JEP 346: Track Metadata on Class File Changes: This feature ensures that changes in class files are effectively tracked in a more reliable manner, improving the efficiency of the reflection API and other class loading mechanisms.
12) JEP 392: Restructured `java.lang` Package: This involves reorganizing existing packages within `java.lang` to improve usability and streamline APIs, making them easier for developers to use.
13) New ` XX` Options: Various new options are introduced for better performance tuning of the Java Virtual Machine, allowing developers more control over the runtime environment.
14) Launchers Enhancements: There are improvements to the launchers for command line applications, providing better ergonomics and user experience, which makes it easier to run Java applications from the command line.
15) Local Variable Type Inference Enhancements: Though introduced earlier, Java 18 continues to improve with the ability to infer local variable types in even more contexts, thus further simplifying coding practices.
These features of Java 18 represent an ongoing evolution of the language aimed at enhancing performance, usability, and developer productivity. Students taking a training program on these features can gain a comprehensive understanding of modern Java development techniques and best practices.
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