Here are some key features and improvements introduced in Java 11:

1. Local-Variable Syntax for Lambda Parameters: Java 11 allows the use of the var keyword for lambda parameters, enhancing code readability.

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   (var x, var y) -> x + y

2. HTTP Client (Standard): Java 11 introduced a new HTTP client API (java.net.http) that provides a more modern and flexible way to send HTTP requests and handle responses.

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   HttpClient client = HttpClient.newHttpClient(); HttpRequest request = HttpRequest.newBuilder() .uri(URI.create("https://example.com")) .build(); HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

3. Nashorn JavaScript Engine Removal: The Nashorn JavaScript engine was deprecated in Java 11 and has been removed from the standard Java distribution. Developers can still use other JavaScript engines or third-party libraries for JavaScript integration.

4. Epsilon Garbage Collector: Java 11 introduced the Epsilon garbage collector, which is a no-op garbage collector. It is useful for performance testing and scenarios where garbage collection is not needed.

5. Local-Variable Syntax for var in Lambda Parameters: Java 11 allows the use of var for lambda parameters, improving code conciseness.

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   (var x, var y) -> x + y

6. Dynamic Class-File Constants: Introduced as a preview feature, this enhancement simplifies the handling of constants in class files.

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   Class.forName("com.example.MyClass");

7. Transport Layer Security (TLS) 1.3: Java 11 includes support for TLS 1.3, the latest version of the Transport Layer Security protocol, providing improved security for network communication.

8. New APIs and Improvements: Java 11 includes various new APIs, improvements, and performance enhancements across the platform.

9. Removed and Deprecated Features: Deprecated and outdated features have been removed or marked for removal in Java 11, leading to a cleaner and more modern platform.