Question

1) add toString method to BankAccount and SavingsAccount classes
2) Override the withdraw() in SavingsAccount so that it will not withdraw more money than is
currently in the account.
3) Provide constructors for SavingsAccount
4) Add this feature to SavingsAccount: If you withdraw more than 3 times you are charged $10 fee
and the fee is immediately withdrawn from your account.once a fee is deducted you get another 3 free withdrawals.
5) Implement the Comparable Interface for SavingsAccount based on balance.
Once you finish adding/modifying the code make sure it compiles and run.
Submit your modified InheritanceTester.java file to the assignment folder

Warning: Notice that there are 3 classes in one file, and only one of them is public,
and this public class name should be the filename. Be careful about the { } braces.

public class InheritanceTester{
public static void main(String[] args){
SavingsAccount tom = new SavingsAccount(5000);
SavingsAccount kim = new SavingsAccount();
tom.withdraw(100);tom.withdraw(1000);tom.withdraw(200);
kim.withdraw(100);//should print error message: Insufficient balance
System.out.println(tom);//should print $3700 as balance
tom.withdraw(1000);
System.out.println(tom);//should print $2690 as balance, and fee charged
tom.withdraw(1000);
System.out.println(tom);//should print $1690 as balance
}
}

class BankAccount
{
private double balance;
public BankAccount()
{ balance = 0; }

public BankAccount(double initialBalance)
{ balance = initialBalance; }

public void deposit(double amount)
{ balance = balance + amount; }

public void withdraw(double amount)
{ balance = balance - amount; }

public double getBalance()
{ return balance; }
}
class SavingsAccount extends BankAccount{
//add code here.

}

Answer 1

Solution :-

Program: In this program, we create the class SavingsAccount which extends BankAccount class. It has two constructors, one default and one arguments constructor, and 4 other methods. Both classes have a toString() method to display information.

Code:

public class InheritanceTester{
    public static void main(String[] args){

        //Creating objects and testing
        SavingsAccount tom = new SavingsAccount(5000);
        SavingsAccount kim = new SavingsAccount();
        tom.withdraw(100);
        tom.withdraw(1000);
        tom.withdraw(200);
        kim.withdraw(100);//should print error message: Insufficient balance
        System.out.println(tom);//should print $3700 as balance
        tom.withdraw(1000);
        System.out.println(tom);//should print $2690 as balance, and fee charged
        tom.withdraw(1000);
        System.out.println(tom);//should print $1690 as balance

    }
}

//Class BankAccount
class BankAccount
{
    private double balance;
    public BankAccount()
    { balance = 0; }

    public BankAccount(double initialBalance)
    { balance = initialBalance; }

    public void deposit(double amount)
    { balance = balance + amount; }

    public void withdraw(double amount)
    { balance = balance - amount; }

    public double getBalance()
    { return balance; }

    @Override
    public String toString() {
        return "BankAccount: " +
                "Balance = $" + balance;
    }
}
//SavingsAccount class
class SavingsAccount extends BankAccount{
//add code here.

    //Member variables for balance and withdraw count checker
    private double balance;
    int countCheck;

    //Constructor
    public SavingsAccount()
    {
        balance = 0;
    }

    //Args Constructor
    public SavingsAccount(double initialBalance)
    {
        this.balance = initialBalance;
    }

    //Function to deduct $10 after 3 withdraws
    public void withdrawDeduction()
    {
        balance = balance - 10;
        countCheck = 0;
    }

    //Withdraw function of Bank Account class modified
    @Override
    public void withdraw(double amount)
    {
        if ((balance - amount < 0) || (amount < 0))
        {
            System.out.println("Insufficient Balance");
        }
        else
            {
            balance = balance - amount;
            countCheck++;
            if (countCheck > 3)
            {
                withdrawDeduction();
            }
        }
    }

    //ToString() method
    @Override
    public String toString()
    {
        return "SavingsAccount: " +
                "Balance = $" + balance;
    }

    //Compares to method
    public int compareTo(SavingsAccount other)
    {
        if(balance < other.balance) return -1;
        if(balance == other.balance) return 0;
        return 1;
    }
}

Output: