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[Java教程]异常3


建立Bank类,类中有变量double balance表示存款,Bank类的构造方法能初始化余额,Bank类中有存款的方法cunKuan(double  balance),取款的发方法withDrawal(double dAmount),当取款的数额大于存款时,抛出InsufficientFundsException,取款数额为负数,抛出NagativeFundsException,当用方法withdrawal(150),withdrawal(-15)时会抛出自定义异常。

 1 public class Bank { 2   double yu_e; 3   double balance; 4  5   Bank(double yu_e) { 6     this.yu_e = yu_e; 7     System.out.println("账户内余额:"+this.yu_e+"元"); 8   } 9 10   void cunKuan(double balance) throws Exception {11     if(balance<0){12       throw new Exception("存款不能为负");13     }14     yu_e += balance;15   }16 17   void withDrawal(double dAmount) throws Exception {18     if(dAmount>yu_e){19       throw new Exception("InsufficientFundsException,余额不足");20     }else if (dAmount<0){21       throw new Exception("NagativeFundsException,取款值为负");22     }23     yu_e -= dAmount;24   }25 26   public static void main(String[] args) {27 28     Bank b = new Bank(10);29     try {30       b.cunKuan(-100);31     } catch (Exception e) {32       e.printStackTrace();33     } 34     35     try {36       b.withDrawal(150);37     } catch (Exception e) {38       e.printStackTrace();39     }40     41     try {42       b.withDrawal(-15);43     } catch (Exception e) {44       e.printStackTrace();45     }46 47     System.out.println("存款余额"+b.yu_e+"元");48 49   }50 51 }

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