If you uninstalled Java, the application you downloaded or licensed would stop working. In the early days of Java, the installation of applications automatically installed Java at the correct version for the application. If you are not running any Java applications, then you don't need Java on your machine. Not just for running and writing Java programs, but there are many applications which only work when Java is installed on the machine such as Eclipse IDE. Since you are supposed to write Java Programs, you should install JDK, which includes JRE. JDK which stands for Java Development Kit, includes JRE plus the development tools ( such as compiler and debugger), which is needed for writing as well as running Java programs. JRE which stands for Java Runtime Environment is needed for running Java programs. Often people get confused with JDK & JRE. The JDK is freely available from Sun Microsystems ( Oracle). The Java Development Kit ( JDK), officially named Java Platform Standard Edition or Java SE, is needed for writing Java programs. So before we look at the steps of How to Install Java? it is better if we first understand why do we need Java installed on the system, whether it is Windows, Mac or Linux. I have been teaching automation for long and I have been asked this question many times that Why do we need to Install Java on the system?.
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