how to run same java program on jdk6, jdk7, jdk8 on my laptop

can i have dedicated folders for each say C drive set to jdk 6
D drive for jdk 7
E drive for jdk8?
so that i do not need to run that batch file everytime?

I think you don't need to have dedicated drivers. You can put them to the same java folder but different version. And don't forget that way to temporarily change JAVA_HOME. When we  re-start SYSTEM_PATH will be restored by the setting in environtment variable.
That's why we have to create the following batch files and run everytime we need.

There's no need for all that. If you have your environment variables set up in the standard way, all you need to do is change JAVA_HOME before running the app

set JAVA_HOME=foo
java -jar thejar.jar

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PATH in Windows should have the following at the front
%JAVA_HOME%\bin;

let me try

i still need to try this. Any good video or tutorials on standard way of setting multiple JDKs?

You've just quoted what i told you to do - what's the problem?

any good document with screenshots or vide0 on this to do step by step. i am not clear on how to do this? please advise

, all you need to do is change JAVA_HOME before running the app

can i have more than one JAVA_HOME

How do i change quickly and re run(i guess i do not have to go to Advanced variables from --My Computer etc?

can i have more than one JAVA_HOME

No.

How do i change quickly and re run

set JAVA_HOME=C:\Some\New\Path
java Foo

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That will do it (IF you've set the PATH properly to include %JAVA_HOME%\bin)

set JAVA_HOME=C:\Some\New\Path
java Foo

(you mean when i open command promt in my windows 10 laptop


do like
C:\Users\xyx>set JAVA_HOME=C:\Program Files\Java\jdk1.7.0_91\bin
C:\Users\xyx>javac Foo.java
C:\Users\xyx>java Foo

then
C:\Users\xyx>set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_91\bin
C:\Users\xyx>javac Foo.java
C:\Users\xyx>java Foo

That will do it (IF you've set the PATH properly to include %JAVA_HOME%\bin)
//this one is from advanced variables of the computer as attached

PATH i have to change every time if i change from say jdk 7 to jdk 8 etc
pathJDK.png

JAVA_HOME does NOT include the bin directory. You don't need to change PATH at all if it's set like i showed

f it's set like i showed

where ? how ?command prompt (or) My Compute -->Advanced Setting -->environmental variables?

Yes, in there

you mean in
My Compute -->Advanced Setting -->environmental variables??