异常—银行

package Exception;
import java.util.*;
public class Bank {
    /*建立exception包，建立Bank类，类中有变量double balance表示存款,
     * Bank类的构造方法能增加存款，Bank类中有取款的发方法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,如new Bank(100),表示存入银行100元，
     * 当用方法withdrawal(150)，withdrawal(-15)时会抛出自定义异常。*/
    private double balance;
    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }

    Bank(double balance)
    {
        this.balance=balance;
    }
    
    double withDrawal(double dAmount) throws Exception
    {
        if(balance<dAmount)
        {
            throw new Exception("InsufficientFundsException");
        }
        else if(dAmount<0)
        {
            throw new Exception("NagativeFundsException");
        }
        return balance-dAmount;
    }
    public static void main(String[] args) {
        // TODO 自动生成的方法存根

        Bank b=new Bank(100);
        try 
        {
            b.withDrawal(150);
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        try
        {
            b.withDrawal(-15);
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        
    }

}