import com.groupdocs.conversion.Converter;
import com.groupdocs.conversion.licensing.License;
import com.groupdocs.conversion.options.convert.ConvertOptions;

public class ConvertTXTtoXLSXusingJava {
    public static void main(String[] args) {

        // Set License to avoid the limitations of Conversion library
        License license = new License();
        license.setLicense("GroupDocs.Conversion.lic");

        // Import TXT document
        Converter converter = new Converter("input.txt");

        // Get conversion option for final output document
        ConvertOptions txttoxlsx = converter.getPossibleConversions("xlsx")
                .getSource().getConvertOptions();

        // Save the XLSX to disk
        converter.convert("result.xlsx", txttoxlsx);
    }
}