Account a1 = new Account("Bob Smith"); a1.printInfo(); a1.increaseSpace(256); EmailAccount ea1 = new EmailAccount("Jane Forester", "jane@abc.com", 32); ea1.printInfo(); ea1.increaseSpace(256); Account a2 = ea1; a2.printInfo(); a2.increaseSpace(256); EmailAccount ea2 = (EmailAccount)a2; ea2.printInfo(); ea2.increaseSpace(256); public abstract class Account { protected String holder; public Account(String holder) { this.holder = holder; } public void printInfo() { System.out.println("Account Holder: " + holder); } } public class EmailAccount extends Account { private String address; private int storagespace; public EmailAccount(String holder, String address, int storagespace) { super(holder); this.address = address; this.storagespace = storagespace; } public void printInfo() { super.printInfo(); System.out.println("Address: " + address); } public void increaseSpace(int amount) { storagespace += amount; } }
Date: 2007-09-26