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ClassLoading?

 
Ranch Hand
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What would be the easiest way to run a java class located inside jar file from within a another running java program?
 
Sheriff
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Add the jar file to your classpath.
Import the class.
Then instanciate the class and call it's methods.

For example, if I had a jar file (foo.jar) with a foo.bar package.
In this package is a class named Thingy with a method called sayHello().

On Unix:
export CLASSPATH=$CLASSPATH:/jars/foo.jar

or on Windows:
set CLASSPATH=%CLASSPATH%;C:\jars\foo.jar

 
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