code: @NullSafe
    public static String getClassSimpleName(Object obj) {
      return obj != null ? obj.getClass().getSimpleName() : null;
    }
docs: Gets the unqualified, simple name of the Class type for the specified Object.  Returns null if the Object reference
  is null.
  
  @param obj the Object who's simple class name is determined.
  @return a String value indicating the simple class name of the Object.
  @see java.lang.Class#getSimpleName()
  @see java.lang.Object#getClass()