code: void checkFields(ClassFile cf) throws ConstantPoolException {
          for (Field f : cf.fields) {
              String type = nameFromDescType(cf.constant_pool.getUTF8Value(f.descriptor.index));
              if (type != null) {
                  DeprData dd = db.getTypeDeprecated(type);
                  if (dd != null) {
                      printHasField(cf, f.getName(cf.constant_pool), type, dd.isForRemoval());
                  }
              }
          }
      }
docs: Checks the fields declared in this class.
  
  @param cf the ClassFile of this class
  @throws ConstantPoolException if a constant pool entry cannot be found