Run jar file

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>

Compile jar file command

jar cvf example.jar *

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]

Java load jar at runtime

URLClassLoader child = new URLClassLoader(
        new URL[] {myJar.toURI().toURL()},
        this.getClass().getClassLoader()
);
Class classToLoad = Class.forName("com.MyClass", true, child);
Method method = classToLoad.getDeclaredMethod("myMethod");
Object instance = classToLoad.newInstance();
Object result = method.invoke(instance);

Source: stackoverflow.com

Run jar file

java -jar yourFile.jar

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