How to put an integer number on a label

Question

I’m trying to put a kind of score counter on a Jlabel ex: you hit a question the score goes to 1 , you miss and nothing happens to the score.

I tried to do it that way :

   private void confirmarActionPerformed(java.awt.event.ActionEvent evt) {                                          
    while (true){
    String pont = " ";
    int pontuacao = Integer.parseInt(pont);
    if (confirmar == a){
        a.setBackground(Color.green);

    }else{
         a.setBackground(Color.red);
    }

   }

}

Error:

Exception in thread "AWT-Eventqueue-0" java.lang.Numberformatexception: For input string: " "

Answer 1

It’s wrong because you’re declaring pont as String and you’re trying to convert " " for Int and as is obvious will give conversion error. It is impossible convert nothing for all, whole must always have some numerical value.