FileDialog saveasFile=new FileDialog(this, "Save File", FileDialog.SAVE);    
      saveasFile.setVisible(true);

      fsname="";
      fsname=saveasFile.getFile()+".txt";
      directory="";
      directory=saveasFile.getDirectory();
File file=new File(directory,fsname);
          FileWriter writer=new FileWriter(file);
          String text=writing.getText();//write textarer to the text
          writer.write(text);//write write into file actually
          writer.close();