【优化】自定义抛出throw 对象练习

  1 package ltb6w;
  2 import java.util.*;
  3 
  4 public class Bank {
  5     
  6     
  7     private boolean bool=true;
  8     private String select;
  9     private String select2;
 10     private double balance=0.0; //余额
 11     private double inputbalance=0.0;
 12     
 13     private Scanner sc=new Scanner(System.in);
 14     
 15 
 16     public Bank() {
 17         
 18         System.out.println("请输入存款额度:");
 19         
 20         
 21     }
 22     
 23     
 24     
 25     @SuppressWarnings("serial")
 26     class  NotSufficientFunds extends Exception { //自定义异常类
 27         
 28             
 29         private String insufficient;
 30 
 31         NotSufficientFunds(String s ) {
 32             
 33             insufficient=s;
 34         }
 35         
 36         public String getMessage() {
 37             
 38             return insufficient;
 39             
 40         }
 41         
 42     }                                              
 43     
 44     
 45     public void deposite() throws Exception{//存款操作
 46         
 47         
 48         try {
 49             
 50             inputbalance=sc.nextInt();// 容易出异常的地方
 51             
 52         }catch (InputMismatchException e) {
 53             
 54             System.out.println("请输入数字:");
 55             
 56             this.bool=false;
 57         }
 58         
 59         
 60         if(inputbalance<0) {
 61             
 62             throw new NotSufficientFunds("存款不能是负数");  //抛出自定义异常
 63         }
 64             
 65         
 66                                
 67         this.balance=inputbalance+balance; 
 68         
 69         System.out.println("存款总额:"+balance);
 70     }             
 71     
 72     public void withdrawa() throws Exception{//取款操作                                                 
 73          
 74         
 75         System.out.println("请输入取款数:");
 76         
 77         
 78         this.balance=balance-sc.nextInt();
 79         
 80                            if (balance<0) { //激发异常类
 81     
 82                 throw new NotSufficientFunds("余额已经是负数了"); 
 83             
 84         }    
 85         
 86         
 87         System.out.println("余额:"+this.getbalawal());
 88     }            
 89     
 90     public double getbalawal() { //获取余额操作
 91         
 92         return balance;
 93     }
 94  
 95     
 96     public void getBank() {
 97         
 98         System.out.println("是否继续存款：是or否");
 99         
100             select=sc.next(); // 容易出异常的地方    
101         
102       
103         if("否".equals(select)) {    
104             
105             
106         while (true) {
107             
108             System.out.println("看仔细了！！！是否还继续取款：是or否");
109             
110             try {
111                 select2=sc.next(); // 容易出异常的地方
112                 
113             }catch (InputMismatchException e) {
114                 
115                 System.out.println("不要输入(是or否)之外无关的数据，从来，再来。"+e.getMessage());
116                 
117                 
118             }
119             
120             if("是".equals(select2)) {
121 
122                 try {
123                     withdrawa();
124                     
125                     break;
126                 } catch (Exception e) {
127                      
128                     e.printStackTrace();
129                 }
130                 
131             }else if ("否".equals(select2)){
132                 
133                 System.out.println("不管你选不选否都当做退出。["+select2+"]");
134                 
135                 break;
136             }
137             
138         }    
139             
140          bool=false;
141         
142         System.out.println("已经成功退出");
143         
144     
145         }else if("是".equals(select)) {
146             System.out.println("继续输入金额，come on baby!");
147         }
148     }
149     
150     
151     public static void main(String[] args) throws Exception {
152         
153         
154         Bank b=new Bank();
155         
156         while (b.bool) {  
157             
158             
159                 b.deposite();  
160                 b.getBank();
161             
162         }
163     
164     }
165 
166 }
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