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Today, we have a very important topic without this knowledge, you won't be able to proceed with this

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training course because to be able to program in Java, you need to have judical installed on your computer

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and we will learn which education to choose and how to make sure that Java is properly installed on

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your computer.

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The latest version based on today is Java version 13.

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Oracle has six months release.

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And so from now on, new version of Java will be released each six months.

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Does that mean for you that you need to learn Java each six months?

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Not necessarily that the developers.

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This can be quite overwhelming.

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How many applications do have to go back and to update now on how many servers in your data center are

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constantly needed to be updated to the newest Java release?

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There are two things developers hate.

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One of them is a necessary change.

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It is even crazy to think about keeping several applications or several number of servers up to date

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with the news release.

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That is why the concept of an Altius was established, and Java LTE, which stands for long term support

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release, is a version of Java that will remain the industry standard for several years.

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To give you an example of this, Java eight was released in 2014 and it's extended support will end

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by December 20th.

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Sergius, probably Java eight, is the most popular nowadays.

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A lot of companies still rely on it and there is no urgent need to upgrade to the newest Java version.

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Java Eleven is the latest long term support version based on today for educational purposes.

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I would recommend you to use the latest version of Open JDK, which will allow you to use the most recent

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and up to date version.

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And to be completely honest, between version eight and version sitting, there is no dramatic difference

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which will be noticed by junior developers.

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There are some of them and we will learn them during the training course.

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You will also notice that you have Oracle Jaedicke and open jaedicke available for you for the cloud.

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Probably main difference for you right now is that open the case completely free, including commercial

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use.

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Oracle JDK is not free for commercial use.

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There are also some other differences.

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For example, when it comes to performance, Oracle is much better regarding the responsiveness and

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Jovian performance.

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Oracle, the case fully developed by Oracle Corporation, whereas the ticket is developed by Oracle

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and the Java community get together.

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So I recommend you to use open JDK.

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This will allow you to learn Java platform and to implement powerful applications.

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Now let me show you how to install the key on the computer from scratch.

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Go to Google and search for duplicate Java Net.

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Let's open this link.

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Select 13.

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Download these archives for Windows or Mac, respectively.

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I'm downloading this one.

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Now, extract archive.

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Let's have a look what is in here.

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So here we have been folder, you can find in it all tools and programs which we need to create our

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Java applications.

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For example, here you can see Java Javadoc.

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This is Java Compiler, which compiled our source code, our files written with letters to bytecode.

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Here's Javadoc application to generate documentation from our source code.

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In the next lessons, I will show you how it works.

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Here is Java application to run Java Virtual Machine.

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Our next steps.

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Please open a common line in this directory to do this type systemd right here and press enter.

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So here's our common line.

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Type Gever Dash version.

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And press enter now you'll see that you have opened the key version 13 here.

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And this is completely fine, but try to navigate one level up in your file system, try the city government,

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also known as change directory.

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It is a common line share common used to change the current work in the rectory in the various operating

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systems.

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The first single dot operator means this directory is a double dot or pyrates means the parent directory

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the next one and the tree lets type Sidis, Nebel, Dot and press enter go ahead and times the same

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Java version common here.

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Java is not recognized as an internal or external command.

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Why do we see this?

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Because from this level we can't get access to Java program, which is located in Benfold.

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As a software engineer, I want to be able to call Java and Java compiler on my machine from any place

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in my file system.

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To do this, I need to configure environment variables.

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Now I will show you how to configure environment variables on Windows machine.

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If you have Mac, please take a look to resources attached to this lesson.

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I have special written guide for you do mouse right.

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Click on my computer open properties, go to advanced system settings and one wearables.

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And here we are now.

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Even despite this, it's not necessary.

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The rule of thumb is to create Java home variable.

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First, this variable will refer to the Jaedicke home folder.

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You can have multiple Java home variables to be able easily change our home version on your machine

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like I have here for Java versions eight, 11 and 13.

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Let's create this variable press new button here.

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Java underscore home.

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And let's hope is this past.

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And paste it as a variable value.

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Press a button.

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Now we have Java home here.

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Next thing to know is that Windows has bars Werrimull.

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Let's find it.

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Here, this bus is an environment variable specifying a set of directories where executable programs

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are located in general, each executing process or user session has its own path setting without past

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variable, we would need to run programs, use an absolute pass.

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The pass variable prevents us from having to write the entire past to a program that suggests value

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here.

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Can you type person sign?

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You have a home.

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Percent saying file past separator and windows, that is backslash and bin.

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That said, in case you have previous Windows version, most likely you see something like this.

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Make sure that line ends with semicolon and write the same.

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So you can choose one option or another, it's up to you and now attention, if you had the terminal

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opened, closed and opened again to apply all changes.

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Let's again, open terminal here.

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Let's go one level up.

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Now, let's dive the same Java version comment.

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Here we are now.

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We can run Java program from any directory.

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Let's also check version of compiler called Java Version.

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Here it is.

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If you see version number, then everything is OK and we are good to proceed with the next lesson.

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Let's summarize what we have learned on this lesson.

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We learned how to choose JDK version.

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What is the difference between Oracle Adjudicate and OpenEdge?

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The key, how to install duplicate on your computer and how to configure environment variables.

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Let's now review your homework for the next lesson.

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So for the next lesson, you just need to repeat everything, what we have discussed during this lesson

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and make sure you have JDK installed.