<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.presentation</artifactId>
        <version>9.4.5</version>
    </dependency>
</dependencies>
    

import com.spire.presentation.FileFormat;
import com.spire.presentation.ITable;
import com.spire.presentation.Presentation;

public class MergeCells {

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

        //Create an object of Presentation class
        Presentation presentation = new Presentation();

        //Load a sample PowerPoint file
        presentation.loadFromFile("sample.pptx");

        //Declare ITable variable
        ITable table = null;

        //Get the table from the first slide by looping through all shapes
        for (Object shape : presentation.getSlides().get(0).getShapes()) {
            if (shape instanceof ITable) {
                table = (ITable) shape;

                //Merge the cells from [0,0] to [3,0]
                table.mergeCells(table.get(0, 0), table.get(3, 0), false);

                //Merge the cells from [0,1] to [0,5]
                table.mergeCells(table.get(0, 1), table.get(0, 5), false);
            }
        }

        //Save the result file
        presentation.saveToFile("MergeCells.pptx", FileFormat.PPTX_2010);
        presentation.dispose();
    }
}

import com.spire.presentation.FileFormat;
import com.spire.presentation.ITable;
import com.spire.presentation.Presentation;

public class SplitCells {

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

        //Create an object of Presentation class
        Presentation presentation = new Presentation();

        //Load a sample PowerPoint file
        presentation.loadFromFile("sample.pptx");

        //Declare ITable variable
        ITable table = null;

        //Get the table from the first slide by looping through all shapes
        for (Object shape : presentation.getSlides().get(0).getShapes()) {
            if (shape instanceof ITable) {
                table = (ITable) shape;

                //Split the cell[2,2] to 2 rows and 2 columns
                table.get(2,2).split(2,2);
            }
        }

        //Save the result file
        presentation.saveToFile("SplitCells.pptx", FileFormat.PPTX_2010);
        presentation.dispose();
    }
}

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.presentation</artifactId>
        <version>9.4.5</version>
    </dependency>
</dependencies>
    

import com.spire.presentation.*;

public class AddTable {
    public static void main(String[] args) throws Exception {
        //Create a Presentation instance
        Presentation presentation = new Presentation();

        //Get the first slide
        ISlide slide = presentation.getSlides().get(0);

        //Define two double arrays to specify the number and size of rows and columns in the table
        Double[] widths = new Double[]{100d, 100d, 150d, 100d, 100d};
        Double[] heights = new Double[]{15d, 15d, 15d, 15d, 15d, 15d, 15d, 15d, 15d, 15d, 15d, 15d, 15d};


        //Add a table with the specified number and size of rows and columns to the slide
        ITable table = slide.getShapes().appendTable((float) presentation.getSlideSize().getSize().getWidth() / 2 - 275, 90, widths, heights);

        //Specify table data
        String[][] dataStr = new String[][]
                {
                        {"Name", "Capital", "Continent", "Area", "Population"},
                        {"Venezuela", "Caracas", "South America", "912047", "19700000"},
                        {"Bolivia", "La Paz", "South America", "1098575", "7300000"},
                        {"Brazil", "Brasilia", "South America", "8511196", "150400000"},
                        {"Canada", "Ottawa", "North America", "9976147", "26500000"},
                        {"Chile", "Santiago", "South America", "756943", "13200000"},
                        {"Colombia", "Bagota", "South America", "1138907", "33000000"},
                        {"Cuba", "Havana", "North America", "114524", "10600000"},
                        {"Ecuador", "Quito", "South America", "455502", "10600000"},
                        {"Paraguay", "Asuncion", "South America", "406576", "4660000"},
                        {"Peru", "Lima", "South America", "1285215", "21600000"},
                        {"Jamaica", "Kingston", "North America", "11424", "2500000"},
                        {"Mexico", "Mexico City", "North America", "1967180", "88600000"}
                };

        //Add data to table
        for (int i = 0; i < 13; i++) {
        for (int j = 0; j < 5; j++) {
        //Fill the table with data
        table.get(j, i).getTextFrame().setText(dataStr[i][j]);

        //Set the text font
        table.get(j, i).getTextFrame().getParagraphs().get(0).getTextRanges().get(0).setLatinFont(new TextFont("Calibri"));

        //Set the text alignment of the table
        table.get(j, i).getTextFrame().getParagraphs().get(0).setAlignment(TextAlignmentType.CENTER);
            }
        }

        //Set the table style
        table.setStylePreset(TableStylePreset.LIGHT_STYLE_3_ACCENT_1);

        //Save the result document
        presentation.saveToFile("AddTable.pptx", FileFormat.PPTX_2013);
    }
}