异常类的处理

import java.util.Scanner;
public abstract class Bank {
	private double  savedMoney;     
	private int  year ;
	private double  income;
	private static double  inRate=0.02 ;
	public abstract double computerIncomes();
	public Bank(){
		
	}
	public Bank(double s,int y){
		savedMoney=s;
		year=y;
	}
    public void saveMoney(double num){
    	savedMoney=savedMoney+num;
    	System.out.println(this.savedMoney);
    }
    public void drawmoney(double money) throws  InsufficientFundsException{  
        if (money > savedMoney) {  
         throw new InsufficientFundsException();
        } else  
           savedMoney -= money;  
    }  
   public double getSavedMoney() {
		return savedMoney;
	}
	public void setSavedMoney(double savedMoney) {
		this.savedMoney = savedMoney;
	}
	public int getYear() {
		return year;
	}
	public void setYear(int year) {
		this.year = year;
	}
	public double getIncome() {
		return income;
	}
	public double getInRate() {
		return inRate;
	}
}
interface Commision {
   double computerComm() ;
}
 class ChinaBank extends Bank implements  Commision {
	private double year;
	private static double HINrate=0.01;
	public ChinaBank(){
		
	}
	public ChinaBank(int s,double y1){
		super(s,(int)y1);
		year=y1;
	}
	
	public void setYear(double years) {
		this.year = years;
		super.setYear((int)years);
	}
	public double computerIncomes(){

		double s;
		s=this.getSavedMoney()*this.getYear()*this.getInRate()+this.getSavedMoney()*(this.year-((int)this.year))*HINrate;
	    return s;
	}

	public double computerComm() {
		if(this.getSavedMoney()>10000)
		{
			return this.getSavedMoney()*0.001*this.getYear();
		}
		else
		{
			return this.getSavedMoney();
		}
	}
}

class InsufficientFundsException extends Exception  {
 	
 		String s;
 		public InsufficientFundsException(){
 			this.s="您的余额不足！";
 		}

 }
class test
{
	public static void main(String[] args) {
		ChinaBank zhangshan=new ChinaBank(20000,1.5);
		System.out.println("请您输入存款金额：");
		Scanner reader=new Scanner(System.in);
	    double money=reader.nextDouble();
	    zhangshan.saveMoney(money);
	    System.out.println("利息是："+zhangshan.computerIncomes());
	    System.out.println("提成是："+zhangshan.computerComm());
	    System.out.println("请您输入取款金额：");
	    Scanner reader1=new Scanner(System.in);
	    double money1=reader1.nextDouble();
	    try{  
	           zhangshan.drawmoney(money1);  
		    	        }  
		    	        catch( InsufficientFundsException e){  
		    	            System.out.println(e.s); 
		    	           
		    	          }
		  System.out.println("您的余额为："+zhangshan.getSavedMoney());
	}
}