How can I add jar files into the namespace in code?

My friends:
I need to add jar files into my namespace dynamicly in my code.But the jar files might be repeated, I am not sure.so, i wonder how can I add them into my namespace, ignoring the repeated files?
This is my code:
URL[] urlArrayA = new URL[5];
urlArray[0] = sample1;
urlArray[1] = sample2;
URL[] urlArrayB = new URL[5];
urlArrayB[0] = sample3;
urlArrayB[1] = sample4;
URLClassLoader urlClassLoaderA = URLClassLoader.newInstance(urlArrayA);
URLClassLoader urlClassLoaderB = URLClassLoader.newInstance(urlArrayB);
how can i visit classes in urlClassLoaderA from classes in urlClassLoaderB?

could anyone please answer the question for me ? thank you...

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