swing - java.lang.numberformatexception empty string java awt -
public class customcalculator extends frame implements actionlistener{ panel jp1 = new panel(); panel jp2 = new panel(); panel jp3 = new panel(); panel jp4 = new panel(); panel jp5 = new panel(); panel center_merge = new panel(); label l2 = new label("quantity : "); textfield l2a = new textfield(20); label l3 = new label("invoice value : "); textfield l3a = new textfield(20); label l4 = new label("exchange rate : "); textfield l4a = new textfield(20); label l5 = new label("costing(a) : "); textfield l5a = new textfield(); label l6 = new label("(a + 1%)(b) : "); label l6a = new label(); label l7 = new label("bcd (c) : "); label l7a = new label(""); label l8 = new label("cvd (d) : "); label l8a = new label(""); label l9 = new label("custom education cess (e) : "); label l9a = new label(""); label l10 = new label("custom sec & higher edu.cess (f) : "); label l10a = new label(""); label l11 = new label("additional duty imports (g) : "); label l11a = new label(""); label l12 = new label("total (h) : "); label l12a = new label(""); label l13 = new label("costing+total (i) : "); label l13a = new label(""); label l14 = new label("(h/quantity) (j) : "); label l14a = new label(""); label l15 = new label("4% sad (g/quantity) (k) : "); label l15a = new label(""); label l16 = new label("net costing (l) : "); label l16a = new label(""); label l17 = new label("transportation (m) : "); textfield l17a = new textfield(5); label l18 = new label("godown rate (n) : "); textfield l18a = new textfield(5); label l19 = new label("brokerage (o) : "); textfield l19a = new textfield(5); label l20 = new label("actual costing (p) : "); label l20a = new label(""); label l21 = new label("small gatepass (q) : "); label l21a = new label(""); label l22 = new label("big gatepass (r) : "); label l22a = new label(""); button l2b = new button("reset"); button l3b = new button("reset"); button l4b = new button("reset"); button master_reset = new button("reset all"); button calc = new button("calculate"); public customcalculator() { super("custom calculator"); this.setsize(800,700); jp1.setlayout(new flowlayout()); //jp1.setborder(borderfactory.createlineborder(color.gray)); jp1.add(l2); jp1.add(l2a); jp1.add(l2b); jp1.add(l3); jp1.add(l3a); jp1.add(l3b); jp1.add(l4); jp1.add(l4a); jp1.add(l4b); jp2.setlayout(new gridlayout(6,2)); //jp2.setborder(borderfactory.createlineborder(color.gray)); jp2.add(l5); jp2.add(l5a); jp2.add(l6); jp2.add(l6a); jp2.add(l7); jp2.add(l7a); jp2.add(l8); jp2.add(l8a); jp2.add(l9); jp2.add(l9a); jp2.add(l10); jp2.add(l10a); jp3.setlayout(new gridlayout(6,2)); //jp3.setborder(borderfactory.createlineborder(color.gray)); jp3.add(l11); jp3.add(l11a); jp3.add(l12); jp3.add(l12a); jp3.add(l13); jp3.add(l13a); jp3.add(l14); jp3.add(l14a); jp3.add(l15); jp3.add(l15a); jp3.add(l16); jp3.add(l16a); jp4.setlayout(new gridlayout(6,2)); //jp4.setborder(borderfactory.createlineborder(color.gray)); jp4.add(l17); jp4.add(l17a); jp4.add(l18); jp4.add(l18a); jp4.add(l19); jp4.add(l19a); jp4.add(l20); jp4.add(l20a); jp4.add(l21); jp4.add(l21a); jp4.add(l22); jp4.add(l22a); center_merge.setlayout(new gridlayout(1,3)); //center_merge.setborder(borderfactory.createlineborder(color.gray)); center_merge.add(jp2); center_merge.add(jp3); center_merge.add(jp4); jp5.setlayout(new flowlayout()); //jp5.setborder(borderfactory.createlineborder(color.gray)); jp5.add(calc); jp5.add(master_reset); this.setlayout(new borderlayout()); this.add(jp1,borderlayout.north); this.add(center_merge,borderlayout.center); this.add(jp5,borderlayout.south); this.addwindowlistener(new windowadapter(){ public void windowclosing(windowevent we) { system.exit(0); } }); l2b.addactionlistener(this); l3b.addactionlistener(this); l4b.addactionlistener(this); calc.addactionlistener(this); master_reset.addactionlistener(this); this.setvisible(true); } public static void main(string[] args) { new customcalculator(); } @override public void actionperformed(actionevent ae) { double quantity = 0; double invoice_value = 0; double exchange_rate = 0; double a=0; double b=0; double c=0; double d=0; double e=0; double f=0; double g=0; double h=0; double i=0; double j=0; double k=0; double l=0; double m = 0; double n = 0; double o=0; double p=0; double q=0; double r=0; try { quantity = double.parsedouble(l2a.gettext()); invoice_value = double.parsedouble(l3a.gettext()); exchange_rate = double.parsedouble(l4a.gettext()); m = double.parsedouble(l17a.gettext()); n = double.parsedouble(l18a.gettext()); o = double.parsedouble(l19a.gettext()); = invoice_value*exchange_rate; b = a+(0.01*a); c = 0.075*b; d = 0.12*(b+c); e = 0.02*(c+d); f = 0.01*(c+d); g = 0.04*(b+c+d+e+f); h = c+d+e+f+g; = a+h; j = h/quantity; k = g/quantity; l = j-k; p = l+m+n+o; q = (0.12*b)/quantity; r = q+k; if(ae.getactioncommand().equals("calc")) { l5a.settext(string.valueof(a)); l6a.settext(string.valueof(b)); l7a.settext(string.valueof(c)); l8a.settext(string.valueof(d)); l9a.settext(string.valueof(e)); l10a.settext(string.valueof(f)); l11a.settext(string.valueof(g)); l12a.settext(string.valueof(h)); l13a.settext(string.valueof(i)); l14a.settext(string.valueof(j)); l15a.settext(string.valueof(k)); l16a.settext(string.valueof(l)); l20a.settext(string.valueof(p)); l21a.settext(string.valueof(q)); l22a.settext(string.valueof(r)); } else if(ae.getactioncommand().equals("master_reset")) { l5a.settext(""); l2a.settext(""); l3a.settext(""); l4a.settext(""); } } catch (exception ex) { l5a.settext(ex.tostring()); // l3a.settext(ex.tostring()); } } } after click calculate button (button calc) calculated values not appear in respective labels , exception shown saying java.lang.numberformatexception: empty string. not able figure out solution. please help.
the line exchange_rate = double.parsedouble(l4a.gettext()); gives exception, because there no value in l4a , trying parse double value, try printing exception in catch clause.
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