lab 17.1

public class CheckingAccount
{
    private double myBalance;
    private String myAccountNumber;

    public CheckingAccount()
    {
        myBalance = 0;
        myAccountNumber= "NEW";
    }

    public CheckingAccount(double initialBalance, String acctNum)
    {
        if(initialBalance < 0)
            throw new IllegalArgumentException("negative initial balance");
        myBalance = initialBalance;
        myAccountNumber = acctNum;
    }

    public double getBalance()
    {
        return myBalance;
    }

    public void deposit(double amount)
    {
        if(amount < 0)
            throw new IllegalArgumentException("negative amount");
        myBalance = myBalance + amount;
    }

    public void withdraw(double amount)
    {
        if(amount < 0 || amount > myBalance)
            throw new IllegalArgumentException("illegal amount");
        myBalance = myBalance - amount;
    }
}


import chn.util.*;
public class CheckingTester
{
    public static void main(String[] args)
    {
        CheckingAccount checking;
        ConsoleIO console = new ConsoleIO();
        double startBal=0;
        double dep = 0;
        double withdraw = 0;

        /*final double INTEREST_RATE = 2.5;
        double interest;

        interest = checking.getBalance() * INTEREST_RATE / 100;
        checking.deposit(interest);

        System.out.println("balance after year 1 is $" + checking.getBalance());

        interest = checking.getBalance() * INTEREST_RATE / 100;
        checking.deposit(interest);

        System.out.println("Balance after year 2 is $" + checking.getBalance());
         */

        System.out.println("");
        System.out.println("ErrorFreeChecking Test");
        System.out.print("Please enter the starting balance----> ");
        startBal = console.readDouble();
        try
        {
            checking = new CheckingAccount(startBal, "A123");
        }
        catch(IllegalArgumentException e)
        {
            System.out.println("Negative balance amount");
            System.out.println("");
        }
        System.out.println("");
        System.out.print("Please enter amount to deposit---->");
        dep = console.readDouble();
        try
        {
            checking.deposit(dep);
        }
        catch(IllegalArgumentException e)
        {
            System.out.println("negative amount");
            System.out.println("");
        }
        System.out.println("");
        System.out.print("Please enter amount to withdraw----->");
        withdraw = console.readDouble();
        checking.withdraw(withdraw);


    }
}