Write a version of the Account class from Chapter 4 so that it is Lockable as defined by PP 7.8 (USING JAVA LANGUAGE)

This is the Account class.

//******************************************************************** // Account.java Author: Lewis/Loftus // // Represents a bank account with basic services such as deposit // and withdraw. //********************************************************************

import java.text.NumberFormat;

public class Account { private final double RATE = 0.035; // interest rate of 3.5%

private long acctNumber; private double balance; private String name;

//----------------------------------------------------------------- // Sets up the account by defining its owner, account number, // and initial balance. //----------------------------------------------------------------- public Account (String owner, long account, double initial) { name = owner; acctNumber = account; balance = initial; }

//----------------------------------------------------------------- // Deposits the specified amount into the account. Returns the // new balance. //----------------------------------------------------------------- public double deposit (double amount) { balance = balance + amount; return balance; }

//----------------------------------------------------------------- // Withdraws the specified amount from the account and applies // the fee. Returns the new balance. //----------------------------------------------------------------- public double withdraw (double amount, double fee) { balance = balance - amount - fee; return balance; }

//----------------------------------------------------------------- // Adds interest to the account and returns the new balance. //----------------------------------------------------------------- public double addInterest () { balance += (balance * RATE); return balance; }

//----------------------------------------------------------------- // Returns the current balance of the account. //----------------------------------------------------------------- public double getBalance () { return balance; }

//----------------------------------------------------------------- // Returns a one-line description of the account as a string. //----------------------------------------------------------------- public String toString () { NumberFormat fmt = NumberFormat.getCurrencyInstance(); return (acctNumber + "\t" + name + "\t" + fmt.format(balance)); } }

Thank you in advance! I've been having a tough time with this one