public String readFile (String filename) {
        //System.out.println ("Lese aus Datei" +filename);
     try {    
          FileReader eingabestrom = new FileReader (filename);
          int gelesen;
          StringBuffer text = new StringBuffer();
          boolean ende =false;
          while (!ende) {
              gelesen = eingabestrom.read();
              if (gelesen == -1)  ende = true;
              else {
                    text.append((char)gelesen);
              }
          }
      eingabestrom.close();
      return text.toString();
     }     
    
      catch ( Exception e ) { System.out.println(e); return "Error"; }
        
    }  
    
 }