Delving Further into Object-Oriented Concepts - Beginning Java Programming: The Object-Oriented Approach - page 248

5.

Create a constructor in the CheckingAccount class that also uses the superclass constructor and
adds this instance variable initialization.

6.

Make the Account class abstract, ensuring that all accounts are either SavingsAccounts or
CheckingAccounts .

7. Override the withdraw() method in the CheckingAccount class to ensure a minimum balance is

maintained in the account. Store the minimum balance required as a static variable. If the with-
drawal is too large, throw an exception, otherwise use the super.withdraw() method.

8.

Override the toString() method from the Object class to print information about Account
instances in the Account class. Override the Account class toString() method to specialize it for
the subclasses in SavingsAccount and CheckingAccount .

9.

Adapt the AccountManager class to try out your new classes and methods. It should look some-
thing like this:

public class AccountManager {
public static void main(String[] args) {
Account mySavings = new SavingsAccount("Save001", "10.00");
try {
mySavings.withdraw("5.00");
} catch (IllegalArgumentException e) {
System.err.println("Invalid Withdrawal");
}
Account myChecking = new CheckingAccount("Check002", "10.00", 1);
try {
myChecking.withdraw("5.00");
} catch (IllegalArgumentException e) {
System.err.println("Invalid Withdrawal");
}
myChecking.deposit("500.00");
try {
myChecking.withdraw("5.00");
} catch (IllegalArgumentException e) {
System.err.println("Invalid Withdrawal");
}
}
}

Your Account , SavingsAccount , and CheckingAccount classes should resemble these:

import java.math.BigDecimal;
public abstract class Account {
private String name;
private BigDecimal amount;
public Account(String acctName, String startAmount) {