Though we can have more than one JDK, it is easier to set paths and to work with just the latest one. Step by Step Installation Of JDKīefore installing the latest JDK version, it is recommended to check our systems for any old JDK versions and uninstall them. This is the minimum RAM required for running basic and small programs, but as the size of an application increases, the memory requirement also increases for the application to run smoothly. JDK requires 128 MB of memory space to run JDK successfully. It requires around 800 MB disk space to install JDK, as JRE also gets installed along with it. JDK has bare minimum requirements for disk space and RAM for the 64-bit Windows platform. Therefore, we will need to install JDK to write and run programs.

Simply put, JRE happens to be a subset of JDK that is, it is included in JDK. JDK is a development kit containing JRE and the development tools (debugger and compiler) needed for getting a program output in Java. Java Runtime Environment (JRE) is required for running programs of Java, whereas JDK is required for writing and running the programs. Do many people have the question, JDK or JRE? So let us look at what each is used for.

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