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How to Install Java JDK9 on Linux?
  • Difficulty Level : Medium
  • Last Updated : 29 Jan, 2021

As we all know Java is widely used in tech industries, with around 4 billion devices currently using java. This Java installation is going to be very easy and beginner-friendly. In this article, we are going to see a step-by-step guide on how you can install java on your Linux machine.

Step-By-Step Process For Installation

Step 1: Downloading JAVA archive binary file head to the link, download and save this archive file on your computer.

Downloading archive  binaries

Step 2: Create an empty directory where you want to install JAVA and copy the downloaded file to that directory.

Created a new Folder (JAVA_GEEK)

Here we created a new folder with the name JAVA_GEEK ( you can name anything), and copy the archive file (jdk-9.0.4_linux-x64_bin.tar.gz) from downloads to the JAVA_GEEK  folder.

We can copy and paste through the terminal or by simply drag a file from downloads to the JAVA_GEEK folder. Here is the command to do so through the terminal.



Syntax: 

$ cp '/home/amninder/Desktop/JAVA_GEEK/jdk-9.0.4_linux-x64_bin.tar.gz' /home/amninder/Desktop

After Copying folder should look like this:

Successfully Copied  

Step 3: Extract the archive file (jdk-9.0.4_linux-x64_bin.tar.gz) using the following command :

$  tar -xf jdk-9.0.4_linux-x64_bin.tar.gz

Extracting  binary archive

This command with extract the binary file and after extracting the file structure should look like this: 

After Extracting.

Step 4: Setting JAVA environment variables 

Why Setting environment variables ?

We set some environment variables to make some things easier. Suppose we don’t set environment variables, in that case if we have to compile a program every time we have to specify the full path of the java bin. 

For example: you’re compiling a Helloworld program then you have compiled it like this.

 $  /home/amninder/Desktop/JAVA_GEEK/jdk-9/bin javac Helloworld.java

But after setting up variables same thing we can achieve by using javac program-name



For Example: Compiling a Helloworld program.

$ javac Helloworld.java

As we can see the difference now, and we know why we should set up variables.

Setting of Java Environment Variables

Firstly Open up the terminal by pressing Ctrl+Alt+T or you can search the terminal in applications. And then type : 

nano /home/amninder/.bashrc

nano is a text editor mostly used in Linux to edit files. Here we are opening the bashrc file is the file where we will provide environment variables, function, and custom alias, this file loads automatically in the background when we open a new terminal every time.

It should look like this, then navigate to the bottom of the file and the type of the JAVA bin path like this:

export PATH="$PATH:/home/amninder/Desktop/JAVA_GEEK/jdk-9.0.4_linux-x64_bin/jdk-9.0.4/bin"

Setting JAVA Path

 

After writing the command, press Ctrl+X and type y, and exit the shell.

Step 5: Setting up default JVM :

Now to inform the system where java and its executable is installed we have to use the update-alternatives command as follows(if you have more than one JDK installed):



$ sudo update-alternatives –install /usr/bin/java java /home/amninder/Desktop/JAVA_GEEK/jdk-9.0.4_linux-x64_bin/jdk-9.0.4/bin/java 100

Update-alternatives is a special command that is in use to updates the links in “/etc/alternatives” to point to other programs.

Similarly, we can do the same for javac also:

$ sudo update-alternatives –install /usr/bin/javac javac /home/amninder/Desktop/JAVA_GEEK/jdk-9.0.4_linux-x64_bin/jdk-9.0.4/bin/javac 100

After creating links, now we can choose between different installation version of java by running the following command:

$ sudo update-alternatives --config java

 After that, it will ask you to choose a default JAVA:

Selecting default java

You have to select the corresponding number as 0 shows for the first version,1 for second so on…

Step 6: Verifying Installation

Finally, the JAVA has been successfully installed on your Linux system, to verify the installation type the following command:

java -version

JAVA Installed successfully

 How to Uninstall jdk9?

Remove the java link

$ sudo update-alternatives –remove java /home/amninder/Desktop/JAVA_GEEK/jdk-9.0.4_linux-x64_bin/jdk-9.0.4/bin/java

Removing java from alternative links

Remove the javac link

$ sudo update-alternatives –remove javac /home/amninder/Desktop/JAVA_GEEK/jdk-9.0.4_linux-x64_bin/jdk-9.0.4/bin/javac

Removing javac from alternative links

Remove the folder where you installed the java

$ sudo rm -rf /home/amninder/Desktop/JAVA_GEEK/jdk-9.0.4_linux-x64_bin

Removing Java folder

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