How to install JDK?

1. You need to install JDK since this is the compiler that will convert JAVA programs in machine language so your computer/machine can understand them. 

2. The Java Development Kit (JDK) is a software development environment used for developing Java applications. It includes the Java Runtime Environment (JRE), an interpreter/loader (java), a compiler (javac), an archiver (jar), a documentation generator (javadoc) and other tools needed in Java development.

3. I would recommend you installing latest JDK version from the following link.

WINDOWS USERS: READ CAREFULLY:

If you have a Mac or a Linux machine, the command prompt/terminal already comes ready to be used. However, if you use a windows machine, please continue reading:

• Make sure you don't have multiple version of JDK in your machine using the following command in the terminal:

            java -version

      This command lists all the java version installed in your machine.

• If there are multiple versions of JDK installed in your windows computer, you might encounter difficulty compiling and executing your program. In that case, you might need to set your JAVA_HOME environment variable to the newest JDK so the IDE knows which version of JDK to use.

• The following video will give you some idea on how to set the java_home environment variable: https://www.youtube.com/watch?v=kzfBT294GXY

• Keep in mind that if you have a windows machine, without setting up the JAVA_HOME environment variable, you will NOT be able to use your command prompt terminal to compile and execute Java programs.