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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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| 40 |
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| Now let me show you how to install the key on the computer from scratch. |
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| 41 |
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| Go to Google and search for duplicate Java Net. |
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| 42 |
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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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| 46 |
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| Now, extract archive. |
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| 47 |
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| Let's have a look what is in here. |
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| 48 |
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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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| 49 |
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| Java applications. |
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| 50 |
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| For example, here you can see Java Javadoc. |
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| 51 |
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| This is Java Compiler, which compiled our source code, our files written with letters to bytecode. |
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| 52 |
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| Here's Javadoc application to generate documentation from our source code. |
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| 53 |
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| In the next lessons, I will show you how it works. |
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| 54 |
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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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| 59 |
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| And press enter now you'll see that you have opened the key version 13 here. |
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| 60 |
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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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| 61 |
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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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| 67 |
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| Java is not recognized as an internal or external command. |
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| 68 |
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| Why do we see this? |
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| 69 |
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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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| 70 |
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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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| 73 |
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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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| 77 |
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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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| 83 |
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| Let's create this variable press new button here. |
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| 84 |
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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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| 91 |
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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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| 94 |
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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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| 99 |
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| That said, in case you have previous Windows version, most likely you see something like this. |
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| 100 |
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| Make sure that line ends with semicolon and write the same. |
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| 101 |
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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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| 103 |
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| Let's again, open terminal here. |
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| 104 |
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| Let's go one level up. |
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| 105 |
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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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| 107 |
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| We can run Java program from any directory. |
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| 108 |
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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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| 110 |
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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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| 111 |
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| Let's summarize what we have learned on this lesson. |
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| 112 |
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| We learned how to choose JDK version. |
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| 113 |
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| What is the difference between Oracle Adjudicate and OpenEdge? |
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| 114 |
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| The key, how to install duplicate on your computer and how to configure environment variables. |
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| 115 |
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| Let's now review your homework for the next lesson. |
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| 116 |
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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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| 117 |
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| and make sure you have JDK installed. |
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