java - GUI calculation issue -

i have been trying ever trying figure out why code jframe wont show correct calculations! when add numbers in windows calculator correct when use program different , incorrect. in program answer 520420 instead of 52420,5 in windows calculator. please tell me going wrong program , correct answer windows calculator? bellow calculate button adds numbers total price if check box selected!

private void calculatorbactionperformed(java.awt.event.actionevent evt) {                                                double price = 0;      if(shoestk.isselected())     {      price = price + 120;     }     if(cricketbatck.isselected())     {        price = price + 300;     }     if(bikeck.isselected())     {         price = price + 20000;     }     if(watchck.isselected())     {         price = price + 500000;     }     if(plasticbagck.isselected())     {         price = price + 0.50;     }      system.out.println(price);     string total = double.tostring(price);     totaltxt.settext(total); }                                            

output of program total being incorrect.

output of windows calcultor , result want.

if(bikeck.isselected()) {     price = price + 20000; } if(watchck.isselected()) {     price = price + 500000; } 

you've got trailing 0 in both of these cases. should 2000 , 50000 respectively.

also, in text 520420 screen shot shows 520420.5 looks plastic bag handled correctly.