Install Java 8 on Ubuntu – Step by Step Guide for Beginners

1. Objective

In this article, we will learn how to install Java 8 on Ubuntu OS. We will install JDK in Ubuntu. Java is a programming language which is actually developed by Sun Microsystems. Java is free to download and used for commercial use.

So, let’s start how to install Java 8 on Ubuntu.

Install Java 8 on Ubuntu – Step by Step Guide for Beginners

2. How to Install Java 8 on Ubuntu?

Follow these steps to install Java 8:

Step.1 Install Java on Ubuntu

Step.2 Install Java on Ubuntu

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Step.3 Install Java on Ubuntu

Step.4 Install Java on Ubuntu

Step.5 Install Java on Ubuntu

Step.6 Install Java 8 on Ubuntu

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Step.7 Install Java 8 on Ubuntu

Step.8 Install Java 8 on Ubuntu

Here we will discuss the steps to install Java 8 on Ubuntu-

i) At first, we will download the package file from the official website. 
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html 

The download package is different for 64 bit and 32-bit versions.

ii) We will need some superuser privileges to install JDK. So we will use the following command-

sudo su

iii) The /opt directory is actually reserved for all the software and add-on packages. This software is not part of the default installation. The command for creating directory for JDK installation is-

mkdir /opt/jdk

Follow this link to know about Java Frameworks

iv) Then we will extract java into the /opt/jdk directory:

tar -zxf jdk-8u5-linux-x64.tar.gz -C /opt/jdk

v) Then we use the following command. This command verifies the file extraction into the /opt/jdk directory.

ls /opt/jdk

vi) By default, we can find java executable in /opt/jdk/jdk1.8.0_05/bin/java directory. To set it as the default JVM we will use:

update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_05/bin/java 100
update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk1.8.0_05/bin/javac 100

vii) Then verify the java has been successfully configured. Run the following command-

update-alternatives --display java
update-alternatives --display javac

We can check the installation by-

java -version

viii) We can also update Java. Hence, download an updated version of Oracle’s website and extract to the /opt/jdk directory. After that, set it as the default JVM with a higher priority number:

update-alternatives --install /usr/bin/java java /opt/jdk/jdk.new.version/bin/java 110
update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk.new.version/bin/javac 110

So, this was all about Installation Java 8 in Ubuntu. Hope you like our explanation.

3. Conclusion

Hence, we studied the steps to install Java 8 on Ubuntu. Furthermore, if you have any Query, feel free to ask in the comment box.

See Also –  Java 10 Features 

Reference