Merge Cells in Word using Java. For further details: https://kb.aspose.com/words/java/merge-cells-in-word-using-java/

Merge Cells in Word using Java.java

import  com.aspose.words.*;

import java.awt.*;

public class Main
{
    static void mergeCells(Cell startCell, Cell endCell)
    {
        Table parentTable = startCell.getParentRow().getParentTable();

        // Define start and ending cell
        Point startCellPos = new Point(startCell.getParentRow().indexOf(startCell), parentTable.indexOf(startCell.getParentRow()));
        Point endCellPos = new Point(endCell.getParentRow().indexOf(endCell), parentTable.indexOf(endCell.getParentRow()));

        // Create a range of cells
        Rectangle range = new Rectangle(Math.min(startCellPos.x, endCellPos.y), Math.min(startCellPos.y, endCellPos.y),
                Math.abs(endCellPos.x - startCellPos.x) + 1, Math.abs(endCellPos.y - startCellPos.y) + 1);

        for (Row currentRow : parentTable.getRows())
        {
            for (Cell cell : currentRow.getCells())
            {
                Point currentPos = new Point(currentRow.indexOf(cell), parentTable.indexOf(currentRow));
                // Validate the current cell
                if (range.contains(currentPos))
                {
                    cell.getCellFormat().setHorizontalMerge(currentPos.x == range.getX() ? CellMerge.FIRST : CellMerge.PREVIOUS);
                    cell.getCellFormat().setVerticalMerge(currentPos.y == range.getY() ? CellMerge.FIRST : CellMerge.PREVIOUS);
                }
            }
        }
    }
    public static void main(String[] args) throws Exception // Merge Table Cells in Java
    {
        // Set the licenses
        new License().setLicense("License.lic");

        Document tableDoc = new Document("Table.docx");

        Table tbl = tableDoc.getFirstSection().getBody().getTables().get(1);

        Cell startingCell = tbl.getRows().get(1).getCells().get(1);
        Cell endingCell = tbl.getRows().get(2).getCells().get(2);

        // Merge the cells
        mergeCells(startingCell, endingCell);

        tableDoc.save("MergeCells.docx");

        System.out.println("Word table merged successfully");
    }
}