Install JDK (JAVA)

Install java

Step 0: Un-Install Older Version(s) of JDK/JRE
I recommend that you install only the latest JDK. Although you can install multiple versions of JDK/JRE concurrently, it is messy.

If you have previously installed older version(s) of JDK/JRE, un-install ALL of them. Goto "Control Panel" ⇒ (optional) "Programs" ⇒ "Programs and Features" ⇒ Un-install ALL programs begin with "Java", such as "Java SE Development Kit ...", "Java SE Runtime ...", "Java X Update ...", and etc.

Step 1: Download JDK
Goto Java SE download site @
https://www.oracle.com/in/java/technologies/javase-downloads.html
Under "Java Platform, Standard Edition" ⇒ "Java SE 13.0.{x}", where {x} denotes a fast running security-update number ⇒ Click the "Oracle JDK Download" button.
Under "Java SE Development Kit 13.0.{x}" ⇒ Check "Accept License Agreement".
Choose the JDK for your operating system, i.e., "Windows".

Step 2: Install JDK

To edit the PATH environment variable in Windows 10:

Launch "Control Panel" ⇒ (Optional) "System and Security" ⇒ "System" ⇒ Click "Advanced system settings" on the left pane.
Switch to "Advanced" tab ⇒ Click "Environment Variables" button.
Under "System Variables" (the bottom pane), scroll down to select variable "Path" ⇒ Click "Edit...".
For Newer Windows 10:
You shall see a TABLE listing all the existing PATH entries (if not, goto next step). Click "New" ⇒ Click "Browse" and navigate to your JDK's "bin" directory, i.e., "c:\Program Files\Java\jdk-13.0.{x}\bin", where {x} is your installation update number ⇒ Select "Move Up" to move this entry all the way to the TOP.
For Older Windows 10 (Time to change your computer!):
(CAUTION: Read this paragraph 3 times before doing this step! Don't push "Apply" or "OK" until you are 101% sure. There is no UNDO!!!)
(To be SAFE, copy the content of the "Variable value" to Notepad before changing it!!!)
In "Variable value" field, APPEND "c:\Program Files\Java\jdk-13.0.{x}\bin" (where {x} is your installation update number) IN FRONT of all the existing directories, followed by a semi-colon (;) to separate the JDK's bin directory from the rest of the existing directories. DO NOT DELETE any existing entries; otherwise, some existing applications may not run.
Variable name : PATH
Variable value : c:\Program Files\Java\jdk-13.0.{x}\bin;[do not delete exiting entries...]
Note: If you have started CMD, you need to re-start for the new environment settings to take effect.
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