异常—银行

 1 package Exception;
 2 import java.util.*;
 3 public class Bank {
 4     /*建立exception包，建立Bank类，类中有变量double balance表示存款,
 5      * Bank类的构造方法能增加存款，Bank类中有取款的发方法withDrawal(double dAmount),
 6      * 当取款的数额大于存款时,抛出InsufficientFundsException,取款数额为负数，
 7      * 抛出NagativeFundsException,如new Bank(100),表示存入银行100元，
 8      * 当用方法withdrawal(150)，withdrawal(-15)时会抛出自定义异常。*/
 9     private double balance;
10     public double getBalance() {
11         return balance;
12     }
13 
14     public void setBalance(double balance) {
15         this.balance = balance;
16     }
17 
18     Bank(double balance)
19     {
20         this.balance=balance;
21     }
22     
23     double withDrawal(double dAmount) throws Exception
24     {
25         if(balance<dAmount)
26         {
27             throw new Exception("InsufficientFundsException");
28         }
29         else if(dAmount<0)
30         {
31             throw new Exception("NagativeFundsException");
32         }
33         return balance-dAmount;
34     }
35     public static void main(String[] args) {
36         // TODO 自动生成的方法存根
37 
38         Bank b=new Bank(100);
39         try 
40         {
41             b.withDrawal(150);
42         }
43         catch(Exception ex)
44         {
45             ex.printStackTrace();
46         }
47         try
48         {
49             b.withDrawal(-15);
50         }
51         catch(Exception ex)
52         {
53             ex.printStackTrace();
54         }
55         
56     }
57 
58 }