If you feel overwhelmed by the choices, then the easy answer of which Java implementation you should install is whichever is easiest for you to install. The IcedTea project is essentially OpenJDK, but its goal is to make it easier for users to build and deploy OpenJDK when using fully free and open source tools. Oracle bundles proprietary components with its Java downloads, while the OpenJDK project is fully open source. Luckily, Java is an open source technology, so if you're not happy with the way Oracle maintains the project, you have other options. When Sun Microsystems was bought by Oracle, Java was a major part of the sale. What's the difference between OpenJDK, IcedTea, and OracleJDK? If you're a developer looking to program in Java, you need the JDK (which includes JRE libraries, which in turn includes a JVM).If you're a user looking to run a Java application, you only need the JRE (which includes a JVM).In terms of downloads, this translates to:

The JDK includes the Java Runtime Environment (JRE). The Java Development Kit (JDK) is a development toolkit: you can think of it as a garage where tinkerers sit around making adjustments, repairs, and improvements. It's included in the Java Runtime Environment (JRE). The Java Virtual Machine (JVM) is a runtime component it's the 'engine' that enables Java applications to launch and run on your computer. Java is broadly split into two downloadable categories. That means, before you can install anything, you have to decide which Java you want to install. Java is an open source language and specification, meaning that anyone can, in theory, create an implementation of it. The bad news is that Java is big, not so much in size as in scope. The good news is that you have many options, and this article covers them all. Because Java is such a popular backend for so many applications, it's good to understand the different ways you can install it. Sometimes you might find an application in an app store, or you might install it with a package manager like DNF on Fedora or Brew on Mac, and other times, you might download an executable or an installer from a website. No matter what operating system you're running, there are usually several ways to install an application.

Install java8