code: @NullSafe
    public static Class<?> getClass(Object obj) {
      return obj != null ? obj.getClass() : null;
    }
docs: Get the Class type of the specified Object.  Returns null if the Object reference is null.
  
  @param obj the Object who's Class type is being determined.
  @return a Class object signifying the type of the specified Object.
  @see java.lang.Object#getClass()