What are the new features introduced in Java 17?

Table of Contents

Introduction

Java 17, released in September 2021, is a long-term support (LTS) version that brings a wealth of new features and enhancements designed to improve performance, security, and developer productivity. With several JEPs (JDK Enhancement Proposals) included, Java 17 solidifies its place as a powerful and versatile programming language. This article highlights the key features introduced in Java 17 and their implications for developers.

Key Features of Java 17

1. JEP 411: Deprecate the Security Manager for Removal

The Security Manager, a mechanism for controlling access to system resources, has been deprecated for future removal. This decision reflects a shift towards more modern security practices and encourages developers to consider alternative approaches.

2. JEP 382: New macOS Rendering Pipeline

Java 17 introduces a new rendering pipeline for macOS, improving the performance and visual fidelity of Java applications on Apple hardware. This is especially beneficial for developers targeting macOS users.

3. JEP 391: macOS/AArch64 Port

This feature adds support for macOS on AArch64 architecture, allowing Java applications to run natively on Apple Silicon devices. This expansion ensures that Java continues to be relevant in the evolving landscape of hardware.

4. JEP 390: Warnings for Value-Based Classes

Java 17 provides warnings for users who try to reference value-based classes directly, such as Optional. This change encourages developers to use these classes appropriately, leading to cleaner and more efficient code.

5. JEP 393: Foreign Function & Memory API (Incubator)

The Foreign Function & Memory API introduces a mechanism to allow Java programs to interact with native code and memory more efficiently. This incubator feature enables developers to call C libraries and manipulate native memory, enhancing performance for certain applications.

6. JEP 384: Context-Specific Deserialization Filters

This feature introduces a mechanism for configuring deserialization filters, improving security by preventing deserialization attacks. Developers can now specify which classes are allowed during the deserialization process, adding an extra layer of protection.

7. JEP 382: Enhanced Pseudo-Random Number Generators

Java 17 enhances its random number generation capabilities with new interfaces and implementations. This feature provides a more comprehensive and flexible way to generate random numbers, supporting various use cases.

8. JEP 411: Sealed Classes (Standard Feature)

Sealed classes, introduced as a preview feature in earlier versions, are now a standard feature in Java 17. They allow developers to control which classes can extend or implement a class or interface, enhancing security and maintainability.

9. JEP 394: Pattern Matching for instanceof (Standard Feature)

This feature, which simplifies type checks and casting, is also standardized in Java 17. It allows developers to write more concise and readable code by eliminating boilerplate associated with the traditional instanceof checks.

Conclusion

Java 17 brings a rich set of features and enhancements that improve performance, security, and developer experience. With important updates like the Foreign Function & Memory API, sealed classes, and pattern matching for instanceof, Java continues to evolve as a powerful and versatile programming language. As a long-term support release, Java 17 is an excellent choice for developers looking to build modern, robust applications. Embracing these new features can significantly enhance your development process and application performance.

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