Java versions overview

Java and JVM don't stay. Every version bring some improvement in performance, standard API and language syntax. Some features evolving from preview stage to standard.

Java 9

• new tool
• private methods in interfaces
• module system
• try with resource improvement
• reactive streams for developing asynchronous, scalable and parallel applications
• HTTP 2 client
• factory methods for immutable list, set, map and Map.Entry
• CompletableFuture API improvements
• Process API improvements

// factory methods for immutable collections
List lst = List.of("str1","str2","str3");
Map map = Map.of(1,"str1",  2,"str2",  3,"str3");
// private methods
public interface DemoInterface{
    // ...
    private void method1(){
        //...
    }

    private static void smethod(){
        // ...
    }
}
Stream.of(1,2,3,4,5,6,7,8,9,10).takeWhile(i -> i < 7 )
                 .forEach(System.out::println);
HttpClient client = HttpClient.newHttpClient();

HttpRequest req =
   HttpRequest.newBuilder(URI.create("http://www.google.com"))
              .header("User-Agent","Java")
              .GET()
              .build();

HttpResponse<String> resp = client.send(req, HttpResponse.BodyHandler.asString());

Java 10

• the var keyword, for define variables

Java 11

• Oracle JDK would no longer be free for commercial use
• support version 10.0 of the Unicode Standard
• local-variable syntax for lambda parameters
• standardizes the Http CLient API
• implementation of the Transport Layer Security (TLS)

Java 14

• switch expressions