Java netbeans - how assign jtextfield value to zero if jtextfield value is empty

Question

    double B=Double.parseDouble(emp_txt2.getText());
    double C=Double.parseDouble(nopay_txt3.getText());
    double E=Double.parseDouble(wop_txt4.getText());
    double F=Double.parseDouble(wop_txt5.getText());

   double f =B+C+E+F;
   String p = String.format("%.2f",f);
   lb1_total3.setText(p);

I want to assign double B,C,E,F values to zero when the jtextfield is empty.

Answer 1

You could use this method instead of Double.parseDouble.

public static double tryParsDouble(String s, double defaultValue) {
     if (s == null) return defaultValue;

     try {
         return Double.parseDouble(s);
     } catch (NumberFormatException x) {
         return defaultValue;
     }  
}

And then to:

double F = tryParsDouble(wop_txt5.getText(), 0.0);