How to hide the data in between the two tags(<hidden> .. </hidden>) in Word document

[kummethab]

I am able to Read the input document using Apache POI and also able to find the data between the tags(What to be hidden) but the problem is i'm unable to write the data in the output file. How can i do the same to write the data and hide it in the output generated file..

For more check the following attachments where the input file has the data with the tags(<hidden>..... </hidden>) and whereas the output file has the data hidden (to check it use Hide/Show toggle box in the toolbar)

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.hwpf.HWPFDocument;
import  org.apache.poi.hwpf.extractor.WordExtractor;
import org.apache.poi.hwpf.usermodel.CharacterRun;
import org.apache.poi.hwpf.usermodel.Range;
 
 
public class Hidden {
    public static void main(String args[]) throws Exception
    {
        File file = new File("D://me1.doc");
        FileInputStream fin = new FileInputStream(file);
        FileOutputStream fout = new FileOutputStream("D://Test.doc");
        HWPFDocument doc = new HWPFDocument(fin);
        Range range = doc.getRange();    
        WordExtractor extractor = new WordExtractor(doc);
        String para[] = extractor.getParagraphText();    
        String output="";
        String hidden="";
        for (String p : para) {
            String[] w = p.split("[<\\>]");             
            for(int k=0 ;k<w.length;k++){
                if(w[k]!=null && !"".equalsIgnoreCase(w[k])){
                    if("hidden".equalsIgnoreCase(w[k])){                            
                        k++;
                        CharacterRun  run = range.getCharacterRun(k);
                        hidden= w[k];
                        k++;                       
                        System.out.println(hidden);
                        run.setVanished(true);
                        doc.write(fout); 
                    }else{
 
                    }
                }
            } 
        }
        fout.close();
        fin.close();
    }