import com.spire.doc.*;
import com.spire.doc.documents.*;

public class ReplaceBookmark {
    public static void main(String[] args){
        //load the Word document
        Document doc = new Document("Bookmark.docx");

        //locate the bookmark."SimpleBookmark"
        BookmarksNavigator bookmarkNavigator = new BookmarksNavigator(doc);
        bookmarkNavigator.moveToBookmark("SimpleBookmark");

        //replace the content of the bookmark with text
        bookmarkNavigator.replaceBookmarkContent("This is new content", false);

        //save the resultant document
        doc.saveToFile("ReplaceWithText.docx", FileFormat.Docx);
    }
}

import com.spire.doc.*;
import com.spire.doc.documents.*;
import com.spire.doc.fields.ParagraphBase;

public class ReplaceBookmark {
    public static void main(String[] args){
        //load the Word document
        Document doc = new Document("Bookmark.docx");

        //add a temp section
        Section tempSection = doc.addSection();
        //add a paragraph and append Html string
        String html = "
This Bookmark has been edited
";
        tempSection.addParagraph().appendHTML(html);

        //Get the first item and the last item of the paragraph
        ParagraphBase firstItem = (ParagraphBase)tempSection.getParagraphs().get(0).getItems().getFirstItem();
        ParagraphBase lastItem = (ParagraphBase)tempSection.getParagraphs().get(0).getItems().getLastItem();
        //create a TextBodySelection object
        TextBodySelection selection = new TextBodySelection(firstItem, lastItem);
        //create a TextBodyPart object
        TextBodyPart bodyPart = new TextBodyPart(selection);

        //locate the bookmark "SimpleBookmark"
        BookmarksNavigator bookmarkNavigator = new BookmarksNavigator(doc);
        bookmarkNavigator.moveToBookmark("SimpleBookmark");

        //replace the content of the bookmark with Html string
        bookmarkNavigator.replaceBookmarkContent(bodyPart);

        //remove the temp section
        doc.getSections().remove(tempSection);

        //save the resultant document
        doc.saveToFile("ReplaceWithHTMLString.docx", FileFormat.Docx);
    }
}

import com.spire.doc.*;
import com.spire.doc.documents.*;

public class ReplaceBookmark {
    public static void main(String[] args){
        //load the Word document
        Document doc = new Document("Bookmark.docx");

        String[][] data =
                {
                        new String[]{"Name", "Capital", "Continent", "Area"},
                        new String[]{"Bolivia", "La Paz", "South America", "1098575"},
                        new String[]{"Brazil", "Brasilia", "South America", "8511196"},
                        new String[]{"Canada", "Ottawa", "North America", "9976147"},
                        new String[]{"Chile", "Santiago", "South America", "756943"},
                };

        //create a table
        Table table = new Table(doc,true);
        table.resetCells(5, 4);
        for (int i = 0; i < data.length; i++) {
            TableRow dataRow = table.getRows().get(i);
            for (int j = 0; j < data[i].length; j++) {
                dataRow.getCells().get(j).addParagraph().appendText(data[i][j]);
            }
        }

        //create a TextBodyPart object
        TextBodyPart bodyPart= new TextBodyPart(doc);
        bodyPart.getBodyItems().add(table);

        //locate the bookmark "SimpleBookmark"
        BookmarksNavigator bookmarkNavigator = new BookmarksNavigator(doc);
        bookmarkNavigator.moveToBookmark("SimpleBookmark");

        //replace the content of the bookmark with table
        bookmarkNavigator.replaceBookmarkContent(bodyPart);

        //save the resultant document
        doc.saveToFile("ReplaceWithTable.docx", FileFormat.Docx);
    }
}