定义银行类_银行发展定义

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在定义银行类时,若取钱数大于余额则作为异常处理(InsufficientFundsException).思路:产生异常的条件是余额少于取额, 因此是否抛出异常要判断条件

取钱是withdrawal（[wið'drɔ:əl, wiθ-]n.撤退，收回；提款；取消；退股）方法中定义的动作,因此在该方法中产生异常.处理异常安排在调用withdrawal的时候,因此withdrawal方法要声明异常,由上级方法调用 要定义好自己的异常类cla Bank

{double balance;

public void deposite(double dAmount)

{if(dAmount>0.0){balance+=dAmount;}}

public void withdrawal(double dAmount)

throws InsufficientFundsException{if(balance

throw new InsufficientFundsException(this,dAmount);}

balance=balance-dAmount;

}

public void show_balance()

{ System.out.println(“The balance is ”+(int)balance);}

}

public cla ExceptionDemo

{ public static void main(String args[])

{ try

{ Bank ba=new Bank(50);

ba.withdrawal(100);

System.out.println(“Withdrawal succeful!”);

}catch(Exception e)

{System.out.println(e.toString());}

}public cla InsufficientFundsException extends Exception{private Bankexcepbank;

private double excepAmount;

InsufficientFundsException(Bank ba, doubledAmount){ excepbank=ba;

excepAmount=dAmount;

}

public StringexcepMesagge()

{String str=“The balance”+ excepbank.showBalance()+“The withdrawal was”+excepAmount;return str;}