写一个父类 账户（Account）（属性：id，password,name,personId,email,余额balance；方法：存款deposit，取款withdraw为一空方法）

写一个子类 储蓄账户（SavingAccount，覆盖父类的取款方法）

写一个子类 信用账户 （CreditAccount，属性：行用额度ceiling，覆盖父类的取款方法）



写一个银行类Bank作测试，属性：账户数组，账户数量，方法：开户register,登录login,存款deposit,取款withdraw,设置透支额度setCeiling,

统计所有账户余额总和getAllBalance，统计所有信用帐户透支额度的总和getAllCeiling，工具方法：按id查询账户getAccountById，写出测试主方法测试各个功能。

-Write a parent account (Account) (attributes: id, password, name, personId, email, balance balance　method: deposit deposit, withdrawal withdraw as an empty method) to write a subclass of savings account (SavingAccount, override the parent' s withdrawal method ) write a subclass of credit accounts (CreditAccount, attribute: credit line with the ceiling, covering the withdrawal method of the parent class) to write a test bank Bank for the property: an array of account, account number, method: account register, login login, savings deposit , ATM withdraw, set the overdraft limit setCeiling, statistical sum of all account balances getAllBalance, overdraft credit accounts statistics for all the sum of getAllCeiling, tool method: query by id account getAccountById, write a test main method to test various functions.