MinMaxAccount.java

public class MinMaxAccount extends BankAccount {
	private double minBalance;
	private double maxBalance;
	
	public MinMaxAccount(Startup s) {
		super(s);

		this.minBalance = getBalance();
		this.maxBalance = getBalance();
	}
	
	public void debit(Debit d) {
		super.debit(d);
		double balance = getBalance();
		if(balance < this.minBalance) {
			this.minBalance = balance;
		}
	}
	
	public void credit(Credit c) {
		super.credit(c);
		if(getBalance() > this.maxBalance) {
			this.maxBalance = getBalance();
		}
	}
}