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Using Inheritance

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For this Programming activity, you will create the SavingAccount class, which inherits directly from the BankAccount class.;The SavingsAccountclass inherits from the version ofthe BankAccountclass;in which the balanceis declared to be private.The SavingsAccountsubclass;adds an annual interestRateinstance variable,as well as supporting meth-;ods to access,change,and apply the interest rate to the account balance.;Instructions;Copy the source files in the Programming Activity 1 directory for this chap-;When you have completed the six tasks,load,compile,and run the Teller;application (Teller.java),which you will use to test your SavingsAccount;class.When the Teller application begins,you will be prompted with a dia-;log box for a starting balance.Ifyou press ?Enter?or the ?OK?button with-;out entering a balance, the Teller application will use the default;constructor to instantiate a SavingsAccountobject.Ifyou enter a starting;balance,the Teller application will prompt you for an interest rate and will;instantiate a SavingsAccountobject using the overloaded constructor.Once;the SavingsAccountobject has been instantiated,the Teller application will;open the window shown in Figure10.10,which provides buttons you can;use to call the SavingsAccountmethods to test your code.;Below the buttons is a ledger that displays the current state ofthe savings;account.As you click on the various buttons,the ledger will display the;operation performed and the values ofthe balance and the interest rate;when that operation is complete. The operations performed by each button are already coded for you and;are the following;IChange Interest Rate?prompts for a new interest rate and calls;your set Interest Rate method;IApply Interest?calls your apply Interest method I Deposit?prompts for the deposit amount and calls the deposit;method inherited from BankAccount I Withdraw?prompts for the withdrawal amount and calls the withdraw method inherited from BankAccount;answer the following questions.;1. Explain why the Teller application can call the withdraw and deposit methods using a SavingsAccount object reference, even though we did not define these methods.;2. Explain why your applyInterest method in the SavingAccount class needs to call the deposit method of the BankAccount class.

 

Paper#67372 | Written in 18-Jul-2015

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