【优化】自定义抛出throw 对象练习

 package ltb6w;
 import java.util.*;

 public class Bank {

     private boolean bool=true;
     private String select;
     private String select2;
     private double balance=0.0; //余额
     private double inputbalance=0.0;

     private Scanner sc=new Scanner(System.in);

     public Bank() {

         System.out.println("请输入存款额度:");

     }

     @SuppressWarnings("serial")
     class  NotSufficientFunds extends Exception { //自定义异常类

         private String insufficient;

         NotSufficientFunds(String s ) {

             insufficient=s;
         }

         public String getMessage() {

             return insufficient;

         }

     }                                              

     public void deposite() throws Exception{//存款操作

         try {

             inputbalance=sc.nextInt();// 容易出异常的地方

         }catch (InputMismatchException e) {

             System.out.println("请输入数字:");

             this.bool=false;
         }

         if(inputbalance<0) {

             throw new NotSufficientFunds("存款不能是负数");  //抛出自定义异常
         }

         this.balance=inputbalance+balance; 

         System.out.println("存款总额:"+balance);
     }             

     public void withdrawa() throws Exception{//取款操作                                                 

         System.out.println("请输入取款数:");

         this.balance=balance-sc.nextInt();

                            if (balance<0) { //激发异常类

                 throw new NotSufficientFunds("余额已经是负数了"); 

         }    

         System.out.println("余额:"+this.getbalawal());
     }            

     public double getbalawal() { //获取余额操作

         return balance;
     }

     public void getBank() {

         System.out.println("是否继续存款：是or否");

             select=sc.next(); // 容易出异常的地方    

         if("否".equals(select)) {    

         while (true) {

             System.out.println("看仔细了！！！是否还继续取款：是or否");

             try {
                 select2=sc.next(); // 容易出异常的地方

             }catch (InputMismatchException e) {

                 System.out.println("不要输入(是or否)之外无关的数据，从来，再来。"+e.getMessage());

             }

             if("是".equals(select2)) {

                 try {
                     withdrawa();

                     break;
                 } catch (Exception e) {

                     e.printStackTrace();
                 }

             }else if ("否".equals(select2)){

                 System.out.println("不管你选不选否都当做退出。["+select2+"]");

                 break;
             }

         }    

          bool=false;

         System.out.println("已经成功退出");

         }else if("是".equals(select)) {
             System.out.println("继续输入金额，come on baby!");
         }
     }

     public static void main(String[] args) throws Exception {

         Bank b=new Bank();

         while (b.bool) {  

                 b.deposite();
                 b.getBank();

         }

     }

 }