java - RichtextString notworking in hssfworkbook cell -

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I want to partially color my Excel sheet cell text so that rich text string can be used for this But it is not working ... there is no error. I am unable to figure out what is wrong. This is my code.

This answer contains the string .. I want to paint the last (,), and the remaining color in red in the red color 

  if (Answer contains ( ",")) {String s = ","; Int second = answer.lastIndexOf (s); HSSFCell cell7 = thisRow.createCell (short) i); Cell7.setCellStyle (style2); HSSFRichTextString richTextString = New HSSFRichTextString (Answer); RichTextString.applyFont (0, second, style 5.getFontIndex ()); Cell7.setCellValue ("+ RichTextString); When I try to use cell7.setCellValue (richTextString); It says: The method is not applicable for the value of the set value (string) HSSFCell (HSSFRichTextString)    
 
 
 You accidentally get a  rich text string  with a  string < / Code> with the empty string  "" . This effectively removes all formatting.  
  ""  Do not include, Yonki an overloaded directly.  
  cell7.setValue (richtextstring);

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