code: public static <T> T defaultValue(Class<T> primitiveOrWrapperType) {
          return (T) PRIMITIVE_OR_WRAPPER_DEFAULT_VALUES.get(primitiveOrWrapperType);
      }
docs: Returns the boxed default value for a primitive or a primitive wrapper.
  
  @param primitiveOrWrapperType The type to lookup the default value
  @return The boxed default values as defined in Java Language Specification,
  <code>null</code> if the type is neither a primitive nor a wrapper