Java™ Application Development on Linux - Dator

292Chapter 12Analysis and Design: Seeking the Objectspublic AccountcreateSub(String name, String amt)throws NumberFormatException{Account acct = new Account(name, owner, amt);// Reduce the parent's unallocated funds.balance = balance.subtract(acct.getTotal());// Connect the accounts to each other.acct.parent = this;children.put(name, acct);return acct;} // createSub/*** Looks up and returns the account with the given name.*/public AccountgetSub(String name){return (Account) children.get(name);} // getSub} // class AccounThe Umbrello UML modeller is an Open Source tool for creating the variousUML diagrams. You can find it at http://uml.sourceforge.net/index.php. We also recommend their online documentation as a good briefintroduction to UML and to Umbrello. It can be found from the main Umbrellopage, or directly at http://docs.kde.org/en/HEAD/kdesdk/umbrello/.12.13EXERCISES1. Imagine a public library. Carry out the CRC nomination process for asystem to track library members and the collection. What list of objectsdo you come up with? What abstract classes do you find? Which did youdiscard and why?2. Extend the purpose of the library program to include generating mailingsto members with overdue materials. Did you add classes? Did you addmethods and/or members? To which classes did you add them?