java - Class Cast Exception when casting double -

java - Class Cast Exception when casting double -

i tried running next code. compiles, throws classcastexception. glad if can help me figure out why.

double costprice = 0; object[] possibilities = null; costprice = (double) joptionpane.showinputdialog( alphapos, "cost price:", "enter values", joptionpane.plain_message, null, possibilities, "");

joptionpane.showinputdialog()returns object (credits @seleenvirtuose) cannot cast double, utilize double.parsedouble() parse string double.

costprice = double.parsedouble(joptionpane.showinputdialog( alphapos, "cost price:", "enter values", joptionpane.plain_message, null, possibilities, ""));

also, can of on 1 line

as declaring double variable , setting straight away, might declare , assign new value in 1 line

double costprice = double.parsedouble(joptionpane.showinputdialog( alphapos, "cost price:", "enter values", joptionpane.plain_message, null, possibilities, ""));

also, possibilities variable null, pass null parameter (unless have changed variable somewhere else)

double costprice = double.parsedouble(joptionpane.showinputdialog( alphapos, "cost price:", "enter values", joptionpane.plain_message, null, nulll, ""));

java casting double joptionpane