package test1;

import java.io.*;
public class CheckingAccount
{
private double balance;
private int number;
public CheckingAccount(int number)
{
this.number = number;
}
public void deposit(double amount)
{
balance += amount;
}
public void withdraw(double amount) throws InsufficientFundsException
{
if(amount <= balance)
{
balance -= amount;
    System.out.println("Withdraw Done......");
}
else
{
double needs = amount - balance;
throw new InsufficientFundsException(needs);
} }
public double getBalance()
{ return balance;
}
public int getNumber()
{return number;
} }
=================================================================================================================
package test1;

public class InsufficientFundsException extends java.lang.Exception
{
private double amount;
public InsufficientFundsException(double amount)
{
this.amount = amount;
}
public double getAmount()
{
return amount;
}
}
==================================================================================================================
package test1;

public class BankDemo
{
public static void main(String [] args)
{CheckingAccount c = new CheckingAccount(101);
System.out.println("Depositing $500...");
c.deposit(500.00);
try
{
System.out.println("\nWithdrawing $100...");
c.withdraw(100.00);
System.out.println("\nWithdrawing $600...");
c.withdraw(600.00);
}catch(InsufficientFundsException e)
{
System.out.println("Sorry, but you Balance is insufficent $"
+ e.getAmount());
e.printStackTrace();
}
}
}