java - Get Value out of Try/Catch exception? -

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i'm try create simple android application currency exchange , got stuck when got try , catch. wanna value of rate inside try , catch , use it, im unable figure out how possible or if possible. appreciated.

        string exchange = "http://rate-exchange.appspot.com/currency?from=" + + "&to=" + + "&q=1";          double rate = 0;              jsonobject json;             try {                 json = readjsonfromurl(exchange);                 for(int = 0; < json.length(); ++)                     rate = json.getdouble("v");             } catch (ioexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             } catch (jsonexception e) {                 // todo auto-generated catch block                  e.printstacktrace();             }              total.settext(string.valueof(rate*amount)); 

double rate = 0; // initialize rate  jsonobject json; try {     //      rate = json.getdouble("v"); // calculate values rate, if try fail                                   //before assign value rate 0  } catch (ioexception e) {   } catch (jsonexception e) {   }   total.settext(string.valueof(rate*amount)); // still rate 0 ,                                               //wrong calculation

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