code: public List<ConstantField> getConstants(Class<?> aClass) {
          List<ConstantField> constants = new ArrayList<>();
          List<Field> fields = Arrays.asList(aClass.getDeclaredFields());
  
          for (Field field : fields) {
              if (Modifier.isStatic(field.getModifiers()) && !Modifier.isFinal(field.getModifiers())) {
                  if (!Modifier.isPublic(field.getModifiers()))
                      if (tryMakeAccessible)
                          field.setAccessible(true);
                      else
                          continue;
                  constants.add(processField(aClass, field));
              }
          }
  
          Iterator<ConstantField> itr = constants.iterator();
          while (itr.hasNext()) {
              if (itr.next() == null)
                  itr.remove();
          }
  
          return constants;
      }
docs: Gets all fields that are potential 'constants'.
  @param aClass the class to work from
  @return all constants that could be found