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# Write a test program that creates an Account object with an account ID of 1122

INSTRUCTIONS TO CANDIDATES

a) (The Account class) Design a class named Account that contains:

■ A private int data field named id for the account (default 0).

■ A private double data field named balance for the account (default 0).

■ A private double data field named annualInterestRate that stores the current interest rate (default 0). Assume all accounts have the same interest rate.

■ A private Date data field named dateCreated that stores the date when the account was created.

■ A no-arg constructor that creates a default account.

■ A constructor that creates an account with the specified id and initial balance.

■ The accessor and mutator methods for id, balance, and annualInterestRate.

■ The accessor method for dateCreated.

■ A method named getMonthlyInterestRate() that returns the monthly interest rate.

■ A method named getMonthlyInterest() that returns the monthly interest.

■ A method named withdraw that withdraws a specified amount from the account.

■ A method named deposit that deposits a specified amount to the account.

Draw the UML diagram for the class and then implement the class. (Hint: The method getMonthlyInterest() is to return monthly interest, not the interest rate.

Monthly interest is balance * monthlyInterestRate. monthlyInterestRate is annualInterestRate / 12. Note that annualInterestRate is a percentage, e.g., like 4.5%. You need to divide it by 100.)

Write a test program that creates an Account object with an account ID of 1122, a balance of \$20,000, and an annual interest rate of 4.5%. Use the withdraw method to withdraw \$2,500, use the deposit method to deposit \$3,000, and print the balance, the monthly interest, and the date when this account was created.

b) (Subclasses of Account) In Programming Exercise (a), the Account class was

defined to model a bank account. An account has the properties account number, balance, annual interest rate, and date created, and methods to deposit and  withdraw funds. Create two subclasses for checking and saving accounts. A checking account has an overdraft limit, but a savings account cannot be overdrawn.

Draw the UML diagram for the classes and then implement them. Write

a test program that creates objects of Account, SavingsAccount, and

CheckingAccount and invokes their toString() methods.

(5/5)

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