Introduction

Oracle has released Java 15, the latest version of the popular programming language. This update brings several new features that developers can leverage to build more efficient, secure, and modern applications. In this post, we’ll discuss some of the key changes and what they mean for developers.

Text Blocks (JEP 378)

One of the most anticipated features in Java 15 is the introduction of text blocks. Text blocks provide a concise way to write multi-line strings without the need for backslashes or quotes. It’s achieved using triple quotes (`”’`) or double quotes (`”””`) on either side of the text. This makes it easier to read long lines of text, such as log messages or configuration files, in your code.

Sealed Classes (JEP 360)

Sealed classes allow developers to restrict subclassing, enhancing type safety and security. In sealed classes, the compiler checks that every instance of the sealed class is either an instance of the sealed class itself or an enumeration or record that extends the sealed class. This feature is particularly useful when working with complex object hierarchies and ensuring that only specific subclasses can be used in specific contexts.

Record Pattern for Switch Expressions (JEP 359)

Records have been a part of Java since version 14, providing a simplified way to define lightweight classes with immutable fields. In Java 15, the switch expression statement now supports record pattern matching. This means you can match on records directly in a switch expression, making it easier to work with complex data structures.

ZGC: Zing Garbage Collector (JEP 367)

The ZGC (Zing Garbage Collector) is an experimental garbage collector that targets high-throughput, low-latency applications. It offers parallel collection with minimal pauses, making it ideal for applications that require real-time responsiveness. While ZGC is primarily designed for use cases like cloud services and big data processing, it’s now available for developers to experiment with and optimize their applications accordingly.

Conclusion

Java 15 brings several exciting features that developers can leverage to build more efficient and modern applications. The introduction of text blocks simplifies the way we handle multi-line strings, while sealed classes and record pattern support for switch expressions improve type safety and readability. Additionally, the inclusion of ZGC as an experimental feature opens up new possibilities for high-throughput, low-latency applications.

Stay tuned for more updates on Java 15 and the exciting features it has to offer!