code: public JarProbeOption classes(Class<?>... klass) {
          for (Class<?> c : klass) {
              String resource = c.getName().replaceAll("\\.", "/") + ".class";
              resources.add(resource);
          }
          return this;
      }
docs: Adds the given classes to the JAR.
  
  @param klass
  list of classes
  @return {@code this} for fluent syntax