sommare valori da JTextField

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From	Gulp® <gulp@hotmail.it>
Newsgroups	it.comp.java
Subject	sommare valori da JTextField
Date	Tue, 29 Sep 2015 09:48:45 +0200
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C'è qualcosa di sbagliato in questo codice?

  private void Somma(){
       double sum =0;
       double imp=0;
       String num;
       for (int i=0;i<13;i++){
         num=txtImportoriga[i].getText();
         if (num.length()>0){
             //imp=Double.valueOf(num);
             imp=parseDouble(num);
         }
         else{
             imp=0;
         }
        sum=sum + imp;
        txtTotale.setText(Uty.StrFormattaCur(sum,false));
     }
     }

Alcuni txtImportoriga hanno stringa: ""

-- 
Gulp®
(forse mi sono perso qualcosa :))

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sommare valori da JTextField Gulp® <gulp@hotmail.it> - 2015-09-29 09:48 +0200
  Re: sommare valori da JTextField "Dr.UgoGagliardelli" <do.not.spam@me.please> - 2015-09-29 12:22 +0200
    Re: sommare valori da JTextField Gulp® <gulp@hotmail.it> - 2015-09-29 15:12 +0200

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