run jar file from java code example

Example 1: how to run java program with external jar files in command prompt

javac -cp "<File-Path>.jar;." <filename>.java
java -cp "<File-Path>.jar;." <filename>

Example 2: run jar file with different jre

First, go to the location of the java installation file. By default, this is:
C:\Program Files\Java\...
Open the folder of the java version you want and go to the bin folder.
Copy the directory your at then go to your command line. 
Syntax: (%PATH% is path you copied):
"%PATH%/java.exe" [javaArgs] [filePath] [yourCodeArgs]