// to represent a checking account in a bank
public class Checking extends Account{

	int minimum;  // The minimum amount a customer is allowed to have
	              // in their account at any particular point in time.

	Checking(int accountNum, int balance, String name, int minimum){
		super(accountNum, balance, name);
		this.minimum = minimum;
	}

	// EFFECT:
	// withdraw the given amount from this account
	public int withdraw(int amount){
		if (balance - amount < minimum) {
			throw new RuntimeException("Insufficient Funds for " + this.name + " Account.");
		} else {
			return this.balance = this.balance - amount;
		}
	}	

}