code: public static Collection<Class<?>> getTypes(Collection<String> typeNames) {
          Set<Class<?>> types = new HashSet<>();
          for (String typeName : typeNames) {
              types.add(ClassHelper.getType(typeName));
          }
          return types;
      }
docs: Load a collection of classes.
  
  @param typeNames
  The class names.
  @return The collection of classes.