Java is a high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle) in the mid-1990s. It is designed to be platform-independent, meaning that Java programs can run on any computer or operating system that has a Java Virtual Machine (JVM) installed.
Here are some key aspects of Java:
- Object-Oriented: Java is an object-oriented programming (OOP) language, which means it emphasizes the use of objects, classes, and other OOP principles such as encapsulation, inheritance, and polymorphism. This enables developers to write modular, reusable, and maintainable code.
- Platform-Independent: One of the main advantages of Java is its platform independence. Java source code is compiled into bytecode, which can then be executed by any JVM. This “write once, run anywhere” capability allows Java applications to be developed on one platform (e.g., Windows) and run on another (e.g., Linux or macOS) without the need for recompilation.
- Strong Standard Library: Java provides a comprehensive standard library known as the Java Class Library (JCL) or the Java Development Kit (JDK). It includes a wide range of pre-built classes and methods for common tasks, such as input/output, networking, database connectivity, user interface development, and more. The standard library simplifies application development and reduces the need for developers to write everything from scratch.
- Robust and Secure: Java was designed with a focus on reliability, robustness, and security. It includes features like automatic memory management (garbage collection), exception handling, and strong type-checking to prevent common programming errors. Additionally, Java enforces strict security measures, such as sandboxing and bytecode verification, to ensure the safe execution of Java applications.
- Multithreading and Concurrency: Java has built-in support for multithreading, allowing developers to create concurrent and parallel applications. The Java Concurrency API provides classes and interfaces for managing threads, synchronization, locks, and concurrent data structures. This makes it easier to develop applications that can efficiently utilize multiple processors or handle concurrent tasks.
- Wide Range of Applications: Java is widely used for developing various types of applications, including desktop applications, web applications, mobile apps (Android development), enterprise software, scientific applications, embedded systems, and more. It has a vast ecosystem of frameworks, libraries, and tools that support different application domains.
- Community and Support: Java has a large and active developer community, which contributes to its popularity and longevity. The community provides extensive documentation, tutorials, forums, and resources to help developers learn, share knowledge, and resolve issues. Additionally, Oracle provides official support and updates for the Java platform.
It’s worth noting that Java has evolved over the years, and new versions and updates have introduced additional features and enhancements. The latest long-term support (LTS) version of Java, as of my knowledge cutoff in September 2021, is Java 17.
- Basic knowledge of Linux commands.
- Up and running Ubuntu 22.04 Machine
- Root permission
In this post, We will show you how to install Java 11 on ubuntu 22.04 LTS Linux machine.
Step 1: Run System Update
We need to 1st update and upgrade the current ubuntu repository to avoid difficulties situations, Use the given command for the same.
To update ubuntu repository.
sudo apt-get update
To upgrade packages.
sudo apt-get upgrade -y
Step 2: Install Java 11
We are ready to install Java 11 package on ubuntu machine by following command.
sudo apt-get install openjdk-11-jdk -y
Step 3: Check Java Version
To check JAVA version after the installation process, We need to execute the given command.
Step 4: Uninstall Java 11
If Java 11 is present, you can remove it by executing the appropriate command based on the package manager you used to install Java 11, If you installed Java 11 using apt (Ubuntu’s default package manager), run the following command:
sudo apt-get remove openjdk-11-*
If you installed Java 11 using snap, run the following command:
sudo snap remove java
If you installed Java 11 manually by downloading and extracting the JDK, you need to locate the Java 11 installation directory and delete it. The directory is typically located in
/usr/local/java. To remove it, run the following command, replacing with the actual directory path:
sudo rm -r <java11_directory>
Verify that Java 11 has been uninstalled by running the
java -version command again. If Java 11 is successfully uninstalled, you should see a message stating that no Java runtime environment is installed or that the command is not found.
That’s it! Java 11 should now be uninstalled from your Ubuntu 22.04 system. Remember to double-check the output of the
java -version command to ensure that Java 11 is no longer present.
We have successfully installed JAVA 11 on ubuntu 22.04 LTS, if you still have questions, please post them in the comments section below.