In this tutorial, we are going to discuss the process of installing Java on Debian 9. Java is a general-purpose programming language developed by Sun Microsystems before being bought by Oracle, who maintain and develop Java to this day. Distinguished as a fast, secure, and reliable language available on all platforms, Java can be established on anything from laptops to game consoles, to computers and cell phones. Since Java code is compiled as bytecode before being executed in a Java Virtual Machine (also known as a JVM), this allows Java programs to be run on any computer architecture with no compatibility barriers.