java - Class Cast Exception when casting double -

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I tried to run the following code, it compiles, but class class throws the extension. I'm really glad if someone can help me. Why 

  double costprice = 0; Object [] possibilities = null; CostPrice = (Double) Joppenpen. Shoinputdialog (Alpha POS, "Cost Price:", "Enter Value", Joppenpen. PLAIN_MESSAGE, Blank, Prospects, "");

answerpace.shoinputdomog () a The object is attributed to the (@SeleenVirtuose) which can not be inserted in double , using double.parseDouble () to parse the string as double To do it. 

  costprice = double. PRSDB (Joppenpen. ShowInputDialog (alpha POS, "cost price:", "enter value", joppenpane.plin_msassage, empty, possibilities, ""));

In addition, you can do all this on one line

As you are declaring the double variable and then directly setting You are probably declaring it as well and assign a new value to a line 

  double costprice = double. PRSD Double (JoptionPan.ShownputDialog (Alpha POS, "Cost Price:", "Enter Value", Joppenpen. PLIN_MASSEge, Zero, Prospects, ""));

In addition to this, as probes variable is zero, simply pass null as the parameter (unless you go anywhere else Do not change) 

  Double CostPrice = Double. PRSDB (Joppenpen Shine InputDialog (Alpha POS, "Cost Price:", "Enter Value", Joppenpen. PLAIN_MESSAGE, Blank, Faucet, ""););

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