java - Cant pinpoint issue of when user inputs number less than 0 for my custom exception -


cant seem figure this. if user inputs invalid balance, how can reprompt them enter balance again , still continue program? 

  //edited still wont work  boolean again;     while(again = true)      {         try {              // pass object printwriter , pw write file             pw = new printwriter(fw);              system.out.print("input beginnning balance: ");             balance = input.nextdouble();             again = false;             // pass user input object             accountwithexception acctexception = new accountwithexception(fullname, balance, id, rate);             again = false;              system.out.println(acctexception.tostring());              // copy object created file             pw.println(acctexception.tostring());             again = false;           // custom exception         } catch (invalidbalanceexception e) {             system.out.println(e.getmessage());         } catch(filenotfoundexception e) {             system.out.println(e.getmessage());         } {             pw.close();

you can throw invalidbalanceexception , catch in catch block this

try {          // pass object printwriter , pw write file         pw = new printwriter(fw);          // pass user input object         accountwithexception acctexception = new accountwithexception(fullname, balance, id, rate);          system.out.println(acctexception.tostring());          // copy object created file         pw.println(acctexception.tostring()); throw new invalidbalanceexception ();          // custom exception if balance < 0     } catch (invalidbalanceexception e) {         system.out.println(e.getmessage());         system.out.println("re-enter balance: ");         balance = input.nextdouble();     } catch(filenotfoundexception e) {         system.out.println(e.getmessage());     } {         system.out.println("text file closed, program complete...");         pw.close();     }

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