public ExcelReader build() {
        return new ExcelReader(readWorkbook);
    }
Read not to {@code cn.idev.excel.metadata.BasicParameter#clazz} value, the default will return type.
Is only effective when set `useDefaultListener=true` or `useDefaultListener=null`.

@see ReadDefaultReturnEnum
fastexcel-core/src/main/java/cn/idev/excel/read/builder/ExcelReaderBuilder.java