These are the best free courses to help you learn Java 8 and Java 9
这些是帮助你学习Java 8和Java 9的最佳 免费课程
After the introduction of the six-month release cycle on Java 10, it’s very difficult to keep up with the latest changes in every Java version. But If you’re looking for some free resources on Java, such as books, tutorials, and other learning materials, then you have come to the right place.
在java10的发布周期为六个月之后，很难跟上最近在每个java版本的改变。但是如果你寻找一些java的免费资源，例如书籍，教程，其他学习资源，那么你就来对地方了。
There are so many resources available to master the features that were introduced in Java 8 and Java 9.
In the past, I have shared some of the best Java 8 tutorials and books. In this article, I am going to share some of the best and free Java 8 and Java 9 courses from Udemy and Pluarlsight.
这里有很多的资源可以用来掌握java8 和java9中介绍的内容
在以前，我曾经分享过一些比较好的关于java8的教程和书籍。在这篇文章中，我讲去分享一些来自于Udemy和Pluarlsight中的比较好的而且免费的java8和java9的课程。
These courses are pretty similar to any paid course you might normally buy and many of these are made free for a promotional or educational purpose. You can join these courses to learn JDK 8 and JDK 9 features in just a couple of days.
这些课程与您通常可以购买的任何付费课程非常相似，并且其中许多是免费的，用于促销或教育目的。 您可以参加这些课程，以在短短几天内学习JDK 8和JDK 9功能。
I used to begin learning new programming features with books, but, nowadays, online courses are my preferred method of learning. There are so many good free courses available.
我曾经从书本上开始学习新的编程知识，但是现在呢，在线课程是我最喜欢的学习方式，有很多好的免费的课程。
Though, sometimes, I have noticed that free courses turn into paid courses, especially after the instructor reaches their promotional targets, hence you should check the price before you join these courses.
虽然有时我注意到免费课程变成了付费课程，尤其是在讲师达到其促销目标之后，因此您应该在加入这些课程之前检查价格
A good idea is to join the courses now, while they are free. Once you are enrolled in the course, you will have free, unlimited access, even after it is turned into a paid course. This means that you can learn whenever you want.
一个好的主意就是加入这些课程，现在他们是免费的。一旦你开始报名了这些课程，你将会免费，不受限制的访问，哪怕是之后它变成了付费的课程。这就意味着你可以在你想学习的任何时候学习。
Even if you are not learning now, you can learn more when you have some free time or your priorities change — there is no harm in enrolling.
即使您现在不学习，当你有闲余时间或者你的优先权变化了，您都可以学到更多东西–注册没有害处。
Why should you Learn Java 8 and Java 9?
为什么你应该学习java8和java9?
If you are wondering about the benefit of learning the features of Java 8 and Java 9, then, let me tell you. If you want to be relevant as a Java developer in today’s job market, you should learn Java 8 now.
如果您想了解学习Java 8和Java 9的功能的好处，那么让我告诉您。 如果您想成为当今工作市场中的Java开发人员，请立即学习Java 8。
I have mentioned previously in my post 10 Things Java Developers Should Learn in 2018, and I am saying it again: learn Java 8 sooner rather than later.
我之前在我的文章《 2018年Java开发人员应该学习的十件事》中提到过，我再说一遍：尽早学习Java 8。
It’s been more than four years since Java 8 was first released, and it was received very well by the Java community. It had several interesting features and language enhancements, like lambda expressions, Stream APIs for bulk operations, new Date and Time APIs for better handling of dates, Default and Static methods on the interface, Method reference, and many more.
Nowadays, more and more companies are adopting the Java 8 style of coding. If you don’t know write code in Java 8 style, such as using lambda and functional programming concepts, you may be left behind.
Not only is Java 8 essential to being relevant in the Java community, but it also improves your productivity and makes writing Java code fun, once you know the basics. That’s where these courses can help!
Coming to Java 9, it didn’t have the spark of Java 8. But it was still packed with some interesting features, like modules and some API enchantments. Knowing those features will, eventually, help you write better Java code and create a better application in Java.
自Java 8首次发布至今已有四年多了，它受到Java社区的好评。它具有一些有趣的功能和语言增强功能，例如lambda表达式，用于批量操作的Stream API，用于更好地处理日期的新的Date和Time API，界面上的Default和Static方法，Method reference等。
如今，越来越多的公司采用Java 8风格的编码。如果您不知道以Java 8风格编写代码（例如使用lambda和函数式编程概念），那么您可能会落伍。
一旦知道了基础知识，Java 8不仅对于在Java社区中发挥作用至关重要，而且还可以提高您的工作效率并使Java代码的编写变得有趣。这些课程可以为您提供帮助！
来到Java 9时，它没有Java 8的spark。但是它仍然充满了一些有趣的功能，例如模块和一些API enchantments。最终，了解这些功能将有助于您编写更好的Java代码并使用Java创建更好的应用程序。
Courses to Learn Java 8 and Java 9
学习Java 8和Java 9的课程
Here is my list of the free online courses to learn Java 8 and Java 9. This list includes courses that are suitable for beginners as well as experienced Java programmers who are not familiar with the JDK 8 and JDK 9 features.
这是我学习Java 8和Java 9的免费在线课程列表，其中包括适合不熟悉JDK 8和JDK 9功能的初学者和有经验的Java程序员的课程。
You don’t need to attend all the courses. You can watch a preview and make a decision on whether to join or not. At the bare minimum, you can join one course on Java 8 and another on Java 9 to get yourself up to speed.
您无需参加所有课程。 您可以观看预览并决定是否加入。 至少，您可以参加Java 8上的一门课程，以及Java 9上的另一门课程，以提高自己的学习速度。
And, since these courses are absolutely free, you have nothing to lose by joining them.
而且，由于这些课程是完全免费的，因此加入它们不会让您有任何损失。
Java 9 Programming for Complete Beginners in 250 Steps
250步完整的初学者Java 9编程
This is an excellent Java course for beginners, especially those who are starting it for the first time. This course covers the latest version of Java, or Java 9.
对于初学者来说，这是一门极好的Java课程，特别是对于那些初次入门的人。 本课程涵盖Java或Java 9的最新版本。
If you want to learn Java from scratch, you can join this course. You will not only learn new features of Java 8 and Java 9, such as functional programming, lambdas, and streams, but also other important concepts of Java.
如果您想从头开始学习Java，则可以参加本课程。 您不仅将学习Java 8和Java 9的新功能，例如功能编程，lambda和流，而且还将学习Java的其他重要概念。
You need to act fast to get this course for free because I am sure instructor Ranga Karanam will make this course paid very soon, once he reaches his promotional target with more than 31K students that have already joined.
您需要迅速采取行动，以免费获得该课程，因为我敢肯定，一旦Ranga Karanam的培训目标达到了3.1万名以上的学生，他就会很快的让这门课程变成付费的。
Anyway, I personally like Ranga’s teaching style and the way he presents concepts, like JShell and Spring concepts in his Spring Framework courses. You will learn a lot in a short period of time — there is no doubt about it.
无论如何，我个人喜欢Ranga的教学风格以及他在Spring Framework课程中介绍概念的方式，例如JShell和Spring概念。 您将在短时间内学到很多东西–毫无疑问。
Java 8: Basics for Beginners
Java 8：初学者基础
This is a very short course for learning some key features of Java 8, including lambda expressions, method references, functional interface, default methods, Stream APIs, and Optional class.
这是一门非常简短的课程，用于学习Java 8的一些关键功能，包括lambda表达式，方法引用，功能接口，默认方法，Stream API和Optional类。
You will not only learn those, but you will also learn the new Date and Time API and other less popular but useful changes.
您不仅将学习这些内容，还将学习新的Date and Time API和其他较不流行但有用的更改。
Even though this course doesn’t provide a comprehensive overview, you can check this out for a quick overview, especially if you are in a rush and don’t have much time to spend on self-learning.
即使本课程没有提供全面的概述，您也可以查看本指南以快速获得概述，尤其是在您急于且没有太多时间花在自学上的时候。
What’s New in Java 8?
Java 8有什么新功能？
This is a more comprehensive course on Java 8, and it covers almost all the features you need to know.
这是一门有关Java 8的更全面的课程，它涵盖了几乎所有您需要了解的功能。
The author, Jose Paumard, has 20 years of experience in computer programming and that shows in this course. You will learn about how lambda expressions and Stream API makes coding in Java fun again.
作者Jose Paumard在计算机编程方面有20年的经验，并且在本课程中可以看到。 您将了解lambda表达式和Stream API如何使Java编码再次变得有趣。
It not only covers major features, such as Date and Time API, but it also covers small API enhancements, like StringJoinger and the join() a method in the String class for joining Strings in Java 8.
它不仅涵盖了诸如日期和时间API之类的主要功能，而且还涵盖了一些小的API增强功能，例如StringJoinger和join（）这个String类中的方法，用于在Java 8中连接String。
You will also learn about JavaFX and JavaScripting using the Nashornengine. Overall, this is a great course to learn Java 8, but the course, unfortunately, is not exactly free.
您还将学习使用Nashorn引擎的JavaFX和JavaScripting。 总体而言，这是学习Java 8的绝妙课程，但是不幸的是，该课程并非完全免费。
What’s New in Java 9?
Java 9有什么新功能？
This is an awesome course to learn Java 9 features from scratch and in quick time. In this online course, Sander Mak, a Java champion and author of the popular book Java 9 Modularity, has explained some important Java 9 changes.
这是一门很棒的课程，可以从头开始并且快速地学习Java 9功能。 在本在线课程中，Java拥护者兼受欢迎的书籍Java 9 Modularity的作者Sander Mak解释了Java 9的一些重要更改。
The course is divided into 6 sections. The first section covers Java modularity, and since the instructor is also the author of the book Java Modularity, you can expect this to be the most comprehensive coverage you can get.
该课程分为6个部分。 第一部分介绍Java模块化，并且由于讲师也是Java Modularity一书的作者，因此您可以期望它是您可以获得的最全面的介绍。
The second section focuses on a more interesting and interactive change from Java 9 — JShell. You will learn about REPL and how to use JShell.
第二部分重点介绍Java 9（JShell）的更有趣且更具交互性的更改。 您将学习REPL以及如何使用JShell。
The third section focuses on small language and library improvements, such as changes in Stream API, Optional, factory methods on Collections, and other improvements. This is the section you will love because you will be using these changes in your day to day life.
第三部分着重于对小型语言和库的改进，例如Stream API的更改，Optional，Collection的工厂方法以及其他改进。 这是您会喜欢的部分，因为您将在日常生活中使用这些更改。
The fourth section focuses on HTTP/2 and Process API changes, while the fifth section focuses on Desktop Java Enhancements, like JavaFX updates.
第四部分重点介绍HTTP / 2和Process API的更改，而第五部分重点介绍桌面Java增强功能，例如JavaFX更新。
The sixth and last section focuses on performance and security enhancements. It explains G1 Garbage Collection changes and the compact String feature introduced in Java 9.
第六部分也是最后一部分将重点介绍性能和安全性增强。它解释了G1垃圾收集的更改以及Java 9中引入的紧凑型String功能。
As with any other Pluralsight course, you need a membership to join this course, either a monthly or annual membership. Though membership doesn’t cost much ($35 per month to access their 5000+ courses), you can still get this and the Java 8 course for free by signing up for a 10-day free trial which is more than enough time to complete these courses.
与任何其他Pluralsight课程一样，您需要有会员资格才能加入此课程，无论是每月会员还是每年会员。尽管会员资格花费不多（每月花费$ 35即可访问其5000+课程），但仍然可以通过注册10天免费试用来免费获得Java 8课程，这是足够的时间来完成这些课程课程
That’s all for now about some of the best, free courses to learn new features of Java 8 and Java 9. I strongly encouraged you to take at least one Java 8 and one Java 9 course to get yourself familiar with new features, particularly the JDK 8 features like lambda expressions, Stream API, Collectors, Optional, and new Date and time API.
到目前为止，这些都是关于一些最佳，免费的课程来学习Java 8和Java 9的新功能的。我强烈建议您至少学习一门Java 8和Java 9课程，以熟悉新功能，尤其是JDK。 8个功能，例如lambda表达式，Stream API，Collector，Optional和新的Date and time API。
Other Free Programming resources you may like:
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5 Free Spring Framework Courses for Java Developers
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Top 5 Courses to Learn Spring Boot in 2018
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