Introduction

Java is a widely-used programming language, and installing it on your Ubuntu Linux system is essential for running a variety of software applications. Oracle Java provides numerous features, including better cross-platform compatibility and enhanced performance optimisation. In this article, we will explore three methods to install Oracle Java on Ubuntu Linux.

Method 1: Using the Official Oracle Java Installation Package

1.1 Download the latest Oracle Java version

Visit the [Oracle Java download page](https://www.oracle.com/java/technologies/javase-downloads.html) and choose the appropriate version for your system (e.g. Java SE 11 LTS). Accept the license agreement and download the tar.gz file.

1.2 Extract the downloaded file

Open a terminal window and navigate to the directory where you downloaded the tar.gz file. Then, extract it using the following command:
“`

tar -xf jdk-{version}_linux-x64_bin.tar.gz

“`

Replace `{version}` with the actual version number you downloaded.

1.3 Move extracted files and set up environment variables

Move the extracted folder to `/opt/` using:

“`

sudo mv jdk-{version} /opt/

“`

Set up environment variables by editing `~/.bashrc` or `/etc/bash.bashrc`:

“`

sudo nano ~/.bashrc

“`

Add these lines at the end of the file:

“`

export JAVA_HOME=/opt/jdk-{version}

export PATH=$PATH:$JAVA_HOME/bin

“`

Save and exit, then run `source ~/.bashrc` to apply changes.

1.4 Verify installation

Check if Oracle Java is installed correctly by executing:

“`

java –version

“`

Method 2: Installing via apt-get package manager (Debian-based systems)

2.1 Add PPA repository

Open a terminal window and run the following commands to add the PPA repository:

“`

sudo add-apt-repository ppa:linuxuprising/java

sudo apt-get update

“`

2.2 Install Oracle Java

To install the latest version of Oracle Java, run the following command:

“`

sudo apt-get install oracle-java{version}-installer

“`

Replace `{version}` with the desired version number.

2.3 Verify installation

Check if Oracle Java is installed correctly by executing:

“`

java –version

“`

Method 3: Using SDKMAN (Software Development Kit Manager)

3.1 Install SDKMAN

Open a terminal window and execute the following command to install SDKMAN:

“`

curl -s “https://get.sdkman.io” | bash

“`

Restart your terminal and run `source “$HOME/.sdkman/bin/sdkman-init.sh”` to apply changes.

3.2 Install Oracle Java using SDKMAN

List available Java versions with:

“`

sdk list java

“`

Install your desired version by running:

“`

sdk install java {version}

“`

Replace `{version}` with the actual version number you want.

3.3 Verify installation

Ensure Oracle Java is installed correctly by executing:

“`

java –version

“`

Conclusion

We have discussed three methods to install Oracle Java on Ubuntu Linux: using the official installation package, installing via apt-get package manager, and employing SDKMAN. Each method has its benefits, and you can choose the one that suits your needs best. Happy coding!