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 }

运行:

posted @ 2016-05-28 13:26  唐枫  阅读(237)  评论(0编辑  收藏  举报