import com.spire.doc.*;
import com.spire.doc.interfaces.ITable;

    public class MergeCells {
    public static void main(String[] args) throws Exception {

        //Create an object of Document class and load the sample document.
        Document document = new Document();
        document.loadFromFile("Sample.docx");

        //Get the first section
        Section section = document.getSections().get(0);

        //Get the first table
        Table table = section.getTables().get(0);

        //Invoike mergeCell()method to merge cells vertically
        mergeCell(table, false, 0, 1, 3);

        //Invoike mergeCell()method to merge cell horizontally
        mergeCell(table, true, 0, 4, 5);

        //Save the document to file
        document.saveToFile("MergeTable.docx",FileFormat.Docx_2013);
}

        //Customize a mergeCell() method to remove the duplicate values while merging cells
        public static void mergeCell(Table table, boolean isHorizontalMerge, int index, int start, int end) {
        
        if (isHorizontalMerge) {
            //Get a cell from table
            TableCell firstCell = table.get(index, start);
            //Invoke getCellText() method to get the cell’s text
            String firstCellText = getCellText(firstCell);
            for (int i = start + 1; i <= end; i++) {
                TableCell cell1 = table.get(index, i);
                //Check if the text is the same as the first cell                
        if (firstCellText.equals(getCellText(cell1))) {
                    //If yes, clear all the paragraphs in the cell
                    cell1.getParagraphs().clear();
                }
            }
            //Merge cells horizontally
            table.applyHorizontalMerge(index, start, end);

        } 
            else {
            TableCell firstCell = table.get(start, index);
            String firstCellText = getCellText(firstCell);
            for (int i = start + 1; i <= end; i++) {
                TableCell cell1 = table.get(i, index);
                if (firstCellText.equals(getCellText(cell1))) {
                    cell1.getParagraphs().clear();
                }
            }
            //Merge cells vertically
            table.applyVerticalMerge(index, start, end);
        }
    }
        public static String getCellText(TableCell cell) {

        StringBuilder text = new StringBuilder();
        //Traverse all the paragraphs of a cell
        for (int i = 0; i < cell.getParagraphs().getCount(); i++) {
            //Get every paragraph’s text and append it to StringBuilder
            text.append(cell.getParagraphs().get(i).getText().trim());
        }
        return text.toString();
    }
}