MultiTypeConfig config = new MultiTypeConfig(); config.setTypeHandler(TextData.class, TextDataHandler.class); config.setTypeHandler(NumericData.class, NumericDataHandler.class); MultiType multiType = new MultiType(config); DataLoader dataLoader = new DataLoader("data.txt"); while (dataLoader.hasNext()) { String line = dataLoader.getNextLine(); Data data = multiType.parse(line); if (data instanceof TextData) { TextDataHandler handler = multiType.getHandler(TextDataHandler.class); handler.process((TextData) data); } else if (data instanceof NumericData) { NumericDataHandler handler = multiType.getHandler(NumericDataHandler.class); handler.process((NumericData) data); } }