# 2.1. Install Java JDK

1. Cài đặt [Java JDK](https://www.oracle.com/java/technologies/javase/jdk11-archive-downloads.html) 11 trở lên

   2\. Thiết lập biến môi trường **JAVA\_HOME**

* Cho [Windows 7](https://medium.com/@tushar0618/setting-java-home-variable-on-windows-7-bab344b6f3c4)
* Cho [Windows 10](https://mkyong.com/java/how-to-set-java_home-on-windows-10/)
* Cho [Linux](https://www.baeldung.com/linux/path-variable)
* Cho MAC OS

  From OS X 10.5, Apple introduced a command line tool (/usr/libexec/java\_home) which dynamically finds the top Java version specified in Java Preferences for the current user.

  Open \~/.bash\_profile in any text editor and add:

```
    Save and close the file.

    Open a Terminal and run the source command to apply the changes:

    $ source ~/.bash_profile

    Now we can check the value of the JAVA_HOME variable:

    $ echo $JAVA_HOME

    The result should be the path to the JDK installation:
  
    $ /Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home
```


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