Jkd configuration win 10
01.This pc > right click > properties or open this pc > right click >
                             properties
02.click advance system setting (check top left corner and right
corner) then go advanced tab > Environment variables
03.On System variables > new
04. Variable name : CLASSPATH
   Variable value : C:\Program Files\Java\jdk1.8.0_281\lib
05.click ok
06.then scroll down and double click “path”
07.click new then type “C:\Program Files\Java\jdk1.8.0_281\bin”
Important :- Do not change any other lines , if they change maybe your some system application not
working properly.
08.click ok again ok.
09. then go cmd and check using “java” and “javac”