自定义抛出throw 对象练习

package ltb6w;
import java.util.*;

public class Bank {
    
    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
        
        inputbalance=sc.nextInt();
        
        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 static void main(String[] args) {
        
        
        Bank b=new Bank();
        
        while (true) {  
            
            try {
                b.deposite();
            } catch (Exception e) {
                
                e.printStackTrace();
            }
            
            System.out.println("是否继续存款：是or否");
            
            
            try {
                b.select=b.sc.next(); // 容易出异常的地方
                
            }catch (InputMismatchException e) {
                
                System.out.println("不要输入(是or否)之外无关的存款数据，从来，再来。");
                
                continue;
                
            }
            
            
            
          
            if("否".equals(b.select)) {    
                
                
            while (true) {
                
                System.out.println("看仔细了！！！是否还继续取款：是or否");
                
                try {
                    b.select2=b.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。");
                    
                    continue;
                    
                }
                
                if("是".equals(b.select2)) {

                    try {
                        b.withdrawa();
                        
                        break;
                    } catch (Exception e) {
                         
                        e.printStackTrace();
                    }
                    
                }else if ("否".equals(b.select2)){
                    
                    System.out.println("不管你选不选否都当做退出。["+b.select2+"]");
                    
                    break;
                }
                
            }    
                
            
            System.out.println("已经成功退出");
            
              break;
        
            }else if("是".equals(b.select)) {
                System.out.println("继续输入金额，come on baby!");
            }
            
        }
    

    }

}