public class Account { // CLASS VARIABLES GO HERE, all instances of class Account share a variable // called accountNumber, which will contain the next available account // number when an account is opened. private static int nextAccount = 1; // INSTANCE VARIABLES GO HERE. Each instance of class account will have // its own copy of the following variables private int account; // instance account # private String holder; // holder name private double balance; // current account balance private boolean overdrawnflag; // indicates if the account is overdrawn // CONSTRUCTORS GO HERE. Each class can have one or more constructors public Account(){account = nextAccount++;balance = 0.0;holder = new String("unknown");overdrawnflag = false; }// end default constructor public Account(double newBalance, String newholder) {account = nextAccount ++;holder = new String(newholder);balance = newBalance;overdrawnflag = false; }// A copy constructor creates a duplicate of an existing object. public Account(Account oldAccount) {account = nextAccount++;balance = oldAccount.balance;overdrawnflag = oldAccount.overdrawnflag;holder = new String(oldAccount.holder); }// end copy constructor // STATIC METHODS GO HERE, static methods are invoked to a class not for // a single object. This method simply prints the next available account # public static void showNextAccountNumber() {System.out.println("the next available account number is: "+ nextAccount);return; }// INSTANCE METHODS GO HERE. All of the following methods are applied // to a specific instance of our class. Credit and Debit are mutators // because they change the balance stored in the instance. // print_Information and check_balance are accessors, because they display // information displayed inside the object, but do not change it.// Accessorspublic double checkBalance() {return balance; }public void printAccount() {System.out.println(" The account number is : " + account);System.out.println(" The account holder is : " + holder);System.out.println(" The account balance is : " + balance);System.out.println(" The account is overdrawn : " + overdrawnflag);return; } public boolean compareTo(Account otherAccount) {if ((this.balance == otherAccount.balance) && (this.overdrawnflag == otherAccount.overdrawnflag) && (this.holder.compareTo(otherAccount.holder) ==0) ) return true;return false; }// end compareTo// Mutatorspublic void credit (double amount) {if (amount >0) this.balance = this.balance + amount;else System.out.println("The amount given must be > 0 for credit to work");return; }public void debit (double amount) {this.balance = this.balance - amount;if (this.balance < 0){ overdrawnflag = true; System.out.println("ERROR: THE CURRENT BALANCE IN THE ACCOUNT IS $" + balance + " THE CURRENT TRANSACTION TO " + " WITHDRAW $" + amount + " WILL CAUSE THE ACCOUNT TO BE OVERDRAWN!"); }return; } } // end of class
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