docs: @Override
      public void visit(Field aField) {
          if (aField.isPrivate()) {
              /*
               * private fields are harmless, as long as they are used correctly
               * inside their own class. This should be something the rest of this
               * detector can find out, so do not report them, they might be false
               * positives.
               */
              return;
          }
          String superclassName = getSuperclassName();
          if (!aField.isStatic() && !"java/lang/Enum".equals(superclassName)) {
              return;
          }
          if (!aField.isPublic() && !aField.isProtected()) {
              return;
          }
          ClassDescriptor classOfField = DescriptorFactory.createClassDescriptorFromFieldSignature(aField.getSignature());
          String tBugType = null;
          int priority = aField.isPublic() && aField.isFinal() && aField.getName().equals(aField.getName().toUpperCase())
                  && getThisClass().isPublic() ? HIGH_PRIORITY : NORMAL_PRIORITY;
          if (classOfField != null) {
              try {
                  if (subtypes2.isSubtype(classOfField, calendarType)) {
                      tBugType = "STCAL_STATIC_CALENDAR_INSTANCE";
                      priority++;
                  } else if (subtypes2.isSubtype(classOfField, dateFormatType)) {
                      tBugType = "STCAL_STATIC_SIMPLE_DATE_FORMAT_INSTANCE";
                  }
                  if (getClassContext().getXClass().usesConcurrency()) {
                      priority--;
                  }
                  if (tBugType != null) {
  
                      pendingBugs.put(getXField(), new BugInstance(this, tBugType, priority).addClass(currentClass).addField(this));
                  }
              } catch (ClassNotFoundException e) {
                  AnalysisContext.reportMissingClass(e);
              }
          }
  
      }