Oracle JDK 12 Ubuntu 18.04 Installation Guide
How to Download and Install Oracle JDK 12 on Ubuntu 18.04 Bionic LTS 64-bit GNU/Linux desktop – Step by step Tutorial.
And Java JDK SE 12 for Ubuntu 18.04 is a Development Environment for Building Applications, and Components Using the Java Programming Language.
Here are some Key Points of JDK:
- Compiler and Tools: The JDK includes a Java compiler (javac) that translates Java source code into bytecode, which can be executed by the Java Virtual Machine (JVM). It also contains various tools for development, debugging, testing, and monitoring Java applications.
- Java Runtime Environment (JRE): In addition to the development tools, the JDK includes the Java Runtime Environment (JRE), which is necessary for running Java applications. The JRE consists of the JVM, class libraries, and other components required for executing Java bytecode.
- Java API Documentation: Oracle JDK provides comprehensive documentation for the Java API (Application Programming Interface). This documentation includes detailed descriptions of classes, interfaces, methods, and other elements of the Java standard library, making it a valuable resource for developers.
- Platform Support: Oracle JDK is available for multiple platforms, including Windows, macOS, and various Unix/Linux distributions. This allows developers to write Java applications that can run on a wide range of operating systems and hardware architectures.
- Security Features: Oracle JDK includes security features to help developers build secure Java applications. This includes support for cryptographic algorithms, secure communication protocols, and mechanisms for managing security policies and permissions.
- Performance Optimization: Oracle continuously works on improving the performance of the JDK, including the JVM and the Java runtime libraries. This ensures that Java applications run efficiently and can scale to meet the performance requirements of various use cases.
- Updates and Support: Oracle provides regular updates and patches for the JDK to address security vulnerabilities, bug fixes, and performance enhancements. Developers can also access technical support and resources through Oracle’s website and community forums.
- Licensing: As of recent updates, Oracle has changed its licensing and support model for Oracle JDK. While Oracle JDK is still available for free for development and testing purposes, commercial use may require a subscription or licensing agreement. Alternatively, developers can use OpenJDK, which is an open-source implementation of the Java Platform, as an alternative to Oracle JDK.
Especially relevant: with the New Deb Package it’s Now Easier to Setup the Java Development Kit on Ubuntu/Debian-based OSes.
Finally, the guide includes instructions on How to Switch the Java Version on Ubuntu 18.04.
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1. Launching Terminal
Open a Terminal Shell Emulator
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands)
In case first see: Terminal Quick Start Guide.
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2. Downloading Oracle JDK 12
Download Oracle JDK 12 GNU/Linux Package
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3. Installing Oracle JDK 12
Then to Setup Oracle JDK 12 on Ubuntu 18.04
First, Access the Target, usually in the Downloads folder:
(But if you are in Trouble to Find it out on Terminal then See: How to Access Downloads Folder from Browser)cd && cd Downloads
Now to Confirm the Package is there do:
ls .
Finally, to Install JDK 12 simply:
sudo dpkg -i jdk-12*.deb
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4. Setting Up Oracle JDK 12
Now to Install JDK 12 into System
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-12/bin/java 1065
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-12/bin/javac 1065
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-12/bin/jar 1065
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5. Switching to Java 12
Finally, to Switch Java to JDK 12
This is Valid only if you have to Manage more than One Java Releases:sudo update-alternatives --config java