java泛型方面的，用到了集合框架的知识，List，Set

package SixthPackage; public class TestBanking { public static void main(String[] args) { Bank bank = new Bank(); bank.addCustomer(new Customer("麻*文")); bank.addCustomer(new Customer("邵*")); Customer cust1 = bank.getCustomer(1); Customer cust2 = bank.getCustomer(2); cust1.addAccount(new SavingAccount(10000.0, 2.1)); cust1.addAccount(new CheckingAccount(10000.0, 10000.0)); cust2.addAccount(new CheckingAccount(10000.0, 5000.0)); Account acc1 = cust1.getAccount(1); System.out.println(cust1.getName() + "的1号账户余额是\t " + acc1.getBalance()); acc1.deposit(1000.0); System.out.println(cust1.getName() + "的1号账户余额是\t" + acc1.getBalance()); acc1.withdraw(20000.0); System.out.println(cust1.getName() + "的1号账户余额是\t" + acc1.getBalance()); acc1.withdraw(10000.0); System.out.println(cust1.getName() + "的1号账户余额是\t" + acc1.getBalance()); CheckingAccount acc2 = (CheckingAccount)cust1.getAccount(2); System.out.println(cust1.getName() + "的2号账户余额是\t" + acc2.getBalance() + " \t透支金额是:\t" + acc2.getOverdraft()); acc2.deposit(1000.0); System.out.println(cust1.getName() + "的2号账户余额是\t" + acc2.getBalance() + " \t透支金额是:\t" + acc2.getOverdraft()); acc2.withdraw(20000.0); System.out.println(cust1.getName() + "的2号账户余额是\t" + acc2.getBalance() + "\t透支金额是:\t" + acc2.getOverdraft()); acc2.withdraw(3000.0); System.out.println(cust1.getName() + "的2号账户余额是\t" + acc2.getBalance() + "\t透支金额是:\t" + acc2.getOverdraft()); acc2.withdraw(10000.0); System.out.println(cust2.getName() + "的2号账户余额是\t" + acc2.getBalance() + "\t透支金额是:\t" + acc2.getOverdraft()); CheckingAccount acc3 = (CheckingAccount)cust2.getAccount(1); System.out.println(cust2.getName() + "的账户余额是\t" + acc3.getBalance() + " \t透支金额是:\t" + acc3.getOverdraft()); acc3.deposit(1000.0); System.out.println(cust2.getName() + "的账户余额是\t " + acc3.getBalance() + "\t透支金额是:\t" + acc3.getOverdraft()); acc3.withdraw(20000.0); System.out.println(cust2.getName() + "的账户余额是\t" + acc3.getBalance() + "\t透支金额是:\t" + acc3.getOverdraft()); acc3.withdraw(3000.0); System.out.println(cust2.getName() + "的账户余额是\t" + acc3.getBalance() + "\t透支金额是:\t " + acc3.getOverdraft()); acc3.withdraw(10000.0); System.out.println(cust2.getName() + "的账户余额是\t" + acc3.getBalance() + " \t透支金额是:\t " + acc3.getOverdraft()); } }