> For the complete documentation index, see [llms.txt](https://wenbo-notes.gitbook.io/coding/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wenbo-notes.gitbook.io/coding/baisc-knowledge/java/setup.md).

# Setup

## Windows

### Install JDK and JRE

1. Download the corresponding installer from [oracle](https://www.oracle.com/java/technologies/downloads/#java8-windows).

<figure><img src="https://3506687383-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0Pzj52wyvCZlIkEholC7%2Fuploads%2F9jquyCDFsIMrvOq7DtuX%2FJava_Install_Windows.png?alt=media&amp;token=c96a9cc1-099b-4240-ab8c-371dfb501743" alt=""><figcaption></figcaption></figure>

2. Execute Installer to install. Quite easy. Note that the installer will install both the JDK and the corresponding JRE.

### Set Path

1. Update the environment variables `PATH`. For me I just need to add `C:\Program Files\Java\jdk-1.8\bin` to my User variable.

## Ubuntu

### Install JDK and JRE

#### JDK

1. Download the corresponding file from [oracle](https://www.oracle.com/java/technologies/downloads/#java8-linux). For Ubuntu users, please download the "Compressed Archive" File.

<figure><img src="https://3506687383-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0Pzj52wyvCZlIkEholC7%2Fuploads%2F0aIkXwbe6cMD7g2RKp3s%2FJava_Install_Ubuntu.png?alt=media&amp;token=c5733f8f-791f-4f1d-8037-369da16b871c" alt=""><figcaption></figcaption></figure>

2. Uncompress the `.tar.gz` using command `tar zxvf your-name.tar.gz`. Then move all the file to a new installation directory if you like. For me, it's `/usr/lib/jvm/jdk-1.8-oracle-x64`.

#### JRE

1. Download the corresponding "Compressed Archive" file from [oracle](https://www.oracle.com/java/technologies/downloads/#java8-linux).

<figure><img src="https://3506687383-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0Pzj52wyvCZlIkEholC7%2Fuploads%2FI2TnBaehdlLnfACemn9v%2FJRE_Install_Ubuntu.png?alt=media&amp;token=07146637-748f-43ae-bb7e-d577a8b2cd92" alt=""><figcaption></figcaption></figure>

2. Uncompress the file and move it to the installation directory. For me it's `/usr/lib/jvm/jre-1.8-oracle-x64`

{% hint style="info" %}
Note that `x64` can be replaced to your architecture.
{% endhint %}

### Set Path

1. Add this line to your `~/.bashrc` (Note to change the directory to yours) \\

   ```bash
   export PATH=/usr/lib/jvm/JDK-directory/bin:$PATH
   ```
2. Reload using `source ~/.bashrc`

## References

1. <https://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html#A1097144>
2. <https://docs.oracle.com/cd/E19215-01/820-2215/6ndr6ai1m/index.html>
3. <https://media.pearsoncmg.com/ph/esm/ecs_liang_ijp_11/cw/content/supplements/Supplement1bInstallingJDK8.pdf>