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As an Ubuntu user, having the right Java setup is crucial for building and running Java applications. But getting the latest Java installed and configured properly can be deceptively tricky.

In this comprehensive 2500+ word guide, I‘ll demystify Java on Ubuntu and show you step-by-step how to:

Install OpenJDK or Oracle JDK with APT or PPAs
Switch between multiple versions like Java 8, 11, 17
Set the default runtime and compiler
Configure environment variables
Troubleshoot issues and uninstall Java

Whether you‘re setting up Java for the first time or upgrading from an older version, this guide has you covered.

Follow along below and you‘ll be building Java apps and services on Ubuntu in no time!

Why You Need the Latest Java

Before we dig into the installation, let‘s look at why Java is so important for developers using Ubuntu and Linux.

Java powers 3 billion devices and runs on 15 billion gadgets worldwide.

It‘s used for:

95% of all enterprise applications – Tools like WebLogic, WebSphere, JBoss, Tomcat
Popular frameworks &#