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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原标题:异常3
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