Java11 New Features

New Features Haim Michael June 4th , 2019 All logos, trade marks and brand names used in this presentation belong to the respective owners. lifemichael Java 11 1st Part https://youtu.be/zggphqAcUvw 2nd Part https://youtu.be/ViL0flSGrGY

© 1996-2018 All Rights Reserved. Haim Michael Introduction ● Professional Certifications Zend Certified Engineer in PHP Certified Java Professional Certified Java EE Web Component Developer OMG Certified UML Professional ● MBA (cum laude) from Tel-Aviv University Information Systems Management lifemichael

© 2008 Haim Michael 20151026 Oracle JDK is not Free  As of Java 11, the Oracle JDK would no longer be free for commercial use.  The Open JDK continues to be free. We can use it instead. However, we won't get nor security updates and nor any update at all.

© 2008 Haim Michael 20151026 Running Java File  We can avoid the compilation phase. We can compile and execute in one command. We use the java command. It will implicitly compile without saving the .class file.

© 2008 Haim Michael 20151026 Java String Methods  The isBlank() method checks whether the string is an empty string, meaning... whether the string solely includes zero or more blanks. String with only white characters is treated as a blank string. public class Program { public static void main(String args[]) { var a = ""; var b = " "; System.out.println(a.isBlank()); System.out.println(b.isBlank()); } }

© 2008 Haim Michael 20151026 Java String Methods  The lines() method returns a reference for a stream of strings that are substrings we received after splitting by lines. public class Program { public static void main(String args[]) { var a = "wenlovenjavanandnkotlin"; var stream = a.lines(); stream.forEach(str->System.out.println(str)); } }

© 2008 Haim Michael 20151026 Java String Methods  The strip(), stripLeading()and the stripTrailing methods remove white spaces from the beginning, the ending and the remr of the string. It is a 'Unicode-Aware' evolution of trim(); public class Program { public static void main(String args[]) { var a = " we love kotlin "; var b = a.strip(); System.out.println("###"+b+"###"); } }

© 2008 Haim Michael 20151026 Java String Methods  The repeat() method repeats the string on which it is invoked the number of times it receives. public class Program { public static void main(String args[]) { var a = "love "; var b = a.repeat(2); System.out.println(b); } }

© 2008 Haim Michael 20151026 Using var in Lambda Expressions  As of Java 11 we can use the var keyword within lambda expressions. interface Calculation { public int calc(int a,int b); } public class Program { public static void main(String args[]) { Calculation f = (var a, var b)-> a+b; System.out.println(f.calc(4,5)); } }

© 2008 Haim Michael 20151026 Inner Classes Access Control  Code written in methods defined inside inner class can access members of the outer class, even if these members are private. class Outer { private void a() {} class Inner { void b() { a(); } } }

© 2008 Haim Michael 20151026 Inner Classes Access Control  As of Java 11, there are new methods in Class class that assist us with getting information about the created nest. These methods include the following: getNestHost(), getNestMembers() and isNestemateOf().

© 2008 Haim Michael 20151026 Epsilon  As of Java 11, the JVM has an experimental feature that allows us to run the JVM without any actual memory reclamation.  The goal is to provide a completely passive garbage collector implementation with a bounded allocation limit and the lowest latency overhead possible. https://openjdk.java.net/jeps/318

© 2008 Haim Michael 20151026 Deprecated Modules Removal  As of Java 11, Java EE and CORBA modules that were already marked as deprecated in Java 9 are now completely removed. java.xml.ws java.xml.bind java.activation java.xml.ws.annotation java.corba java.transaction java.se.ee jdk.xml.ws jdk.xml.bind

© 2008 Haim Michael 20151026 Flight Recorder  The Flight Recorder is a profiling tool with a negligible overhead below 1%. This extra ordinary overhead allows us to use it even in production.  The Flight Recorder, also known as JFR, used to be a commercial add-on in Oracle JDK. It was recently open sourced.

© 2008 Haim Michael 20151026 The HTTP Client package com.lifemichael.samples; import java.io.IOException; import java.net.http.*; import java.net.*; import java.net.http.HttpResponse.*; public class HTTPClientDemo { public static void main(String args[]) { HttpClient httpClient = HttpClient.newBuilder().build();

© 2008 Haim Michael 20151026 The HTTP Client HttpRequest request = HttpRequest.newBuilder().uri(URI.create( "http://www.abelski.com/courses/dom/lib_doc.xml")) .GET() .build(); try { HttpResponse<String> response = httpClient.send( request, BodyHandlers.ofString()); System.out.println(response.body()); System.out.println(response.statusCode()); } catch (IOException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } } }

© 2008 Haim Michael 20151026 The HTTP Client  The new HTTP Client allows us to initiate an asynchronous HTTP request. HttpClient .sendAsync(request,BodyHandlers.ofString()) .thenAccept(response -> { System.out.println(response.body()); //.. });

© 2008 Haim Michael 20151026 The HTTP Client  The new HTTP Client supports the WebSocket protocol. HttpClient httpClient = HttpClient.newBuilder() .executor(executor).build(); Builder webSocketBuilder = httpClient.newWebSocketBuilder(); WebSocket webSocket = webSocketBuilder .buildAsync( URI.create("wss://echo.websocket.org"), … ).join();

© 2008 Haim Michael 20151026 The ZGC Scalable Low Latency GC  As of Java 11, we can use the ZGC. This new GC is available as an experimental feature.  ZGC is a scalable low latency garbage collector. It performs the expensive work concurrently without stopping the execution of application threads for more than 10ms.

© 2008 Haim Michael 20151026 Files Reading and Writing public class FilesReadingDemo { public static void main(String args[]) { try { Path path = FileSystems.getDefault() .getPath(".", "welove.txt"); String str = Files.readString(path); System.out.println(str); } catch (IOException e) { e.printStackTrace(); } }

© 2008 Haim Michael 20151026 Files Reading and Writing public class FilesWritingDemo { public static void main(String args[]) { Path path = FileSystems.getDefault() .getPath(".", "welove.txt"); try { Files.writeString(path, "we love php", StandardOpenOption.APPEND); } catch (IOException e) { e.printStackTrace(); } } }

Java11 New Features

More Related Content

What's hot

Similar to Java11 New Features

More from Haim Michael

Recently uploaded

In this document

Java11 New Features