@Override
    public Double convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty,
                                    GlobalConfiguration globalConfiguration) {
        return cellData.getNumberValue().doubleValue();
    }
Double and number converter

@author Jiaju Zhuang
fastexcel-core/src/main/java/cn/idev/excel/converters/doubleconverter/DoubleNumberConverter.java