How To Install Java On Ubuntu 24.04 LTS (Linux)

How To Install Java on Ubuntu 24.04 LTS (Linux) | Step-by-Step Java Setup Guide

Need to set up Java on your Ubuntu 24.04 LTS system? In this step-by-step tutorial, we’ll show you **how to install Java (JDK) on Ubuntu 24.04**—whether you’re a developer preparing to build Java apps or simply need Java for running software.

We’ll cover how to install both **OpenJDK and Oracle JDK**, and how to **set the default Java version** if multiple versions are installed. Whether you’re new to Linux or a seasoned Ubuntu user, this guide will help you get Java up and running in just a few minutes.

🧰 **What You’ll Learn:**

* Installing OpenJDK 21 (default in Ubuntu 24.04)
* Installing Oracle JDK manually (optional)
* Verifying the Java installation
* Setting JAVA\_HOME and environment variables
* Switching between multiple Java versions

📦 **Commands Covered:**

“`bash
sudo apt update
sudo apt install default-jdk
java -version
javac -version
“`

To install a specific version like OpenJDK 17 or 21:

“`bash
sudo apt install openjdk-17-jdk
sudo apt install openjdk-21-jdk
“`

To switch between versions:

“`bash
sudo update-alternatives –config java
sudo update-alternatives –config javac
“`

Set `JAVA_HOME`:

“`bash
sudo nano /etc/environment
# Add: JAVA_HOME=”/usr/lib/jvm/java-17-openjdk-amd64″
source /etc/environment
echo $JAVA_HOME
“`

☕ **Why Install Java?**

* Run Java-based applications like IntelliJ IDEA, Eclipse, Minecraft servers, etc.
* Compile and run Java code for development or production
* Build Android or enterprise applications with tools like Gradle, Maven, and Spring

📌 **Works On:**
✅ Ubuntu 24.04 LTS
✅ Debian-based distros
✅ Compatible with Java apps, IDEs, and tools

💬 Drop your questions or issues in the comments—we’ll help you out!

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