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} 21. Press F5 to run the application. The result is shown here:
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Using the Derived Classes Polymorphically In the preceding sections, you demonstrated that inheritance allows you to reuse code from a base class. You defined a Deposit method in the base class, BankAccount. You used that method from an instance of SavingsAccount, even though you wrote no code for the Deposit method in the SavingsAccount class. Not only does inheritance let you reuse code, but it also allows you to use classes polymorphically. This means that you can refer to an instance of the derived class as though it were an instance of the base class, as shown here: Visual Basic Dim account as BankAccount account = New CheckingAccount("Your Name") account.Deposit(25D)
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account.Withdraw(5D) Balance is 20. // Visual C# BankAccount account; account = new CheckingAccount("Your Name"); account.Deposit(25M); account.Withdraw(5M); // Balance is 19.75. Polymorphism also provides that when this code is executed, the runtime determines the actual type of the instance, BankAccount, SavingsAccount, or CheckingAccount. It then calls the Withdraw method defined for the actual type. There are ways to override this behavior, but in the code you ve written the Withdraw method of the CheckingAccount object would be called in the preceding example. In the next section, you ll see how you can use classes polymorphically. Create the user interface 1. Open Form1 in the designer. 2. Set the Text property of Form1 to The Bank . 3. Drag a Label onto Form1 and set its Text property to Account. 4. Drag a ComboBox control onto Form1 next to the Label and set its Name property to account. Delete the Text property, so that it s blank. 5. Drag another Label onto Form1 and set its Text property to Transaction. 6. Drag a ComboBox control onto Form1 and set its Name property to action. Delete the text in the Text property s box so that it s blank. 7. In the Properties window, click the ellipsis button ( ) next to the Items property of the action ComboBox. Use the String Collection Editor dialog box to enter two strings, Deposit and Withdraw. 8. Drag another Label onto Form1 and set its Text property to Amount. 9. Drag a TextBox onto Form1 and set its Name property to amount. Delete the Text property, so that it is blank. 10. Drag a Button onto Form1. Set its Name property to submit and its Text property to Submit. Here s the complete user interface:
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Create the accounts 1. Double-click Form1 to display the Form1_Load method in the code editor. 2. Delete the test code for the CheckingAccount class. 3. Add these fields to Form1: 4. 5. 6. 7. 8. // Visual C# Visual Basic Private checking As New CheckingAccount("Your Name") Private savings As New SavingsAccount("Your Name")
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private CheckingAccount checking = new CheckingAccount("Your Name");
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10. private SavingsAccount savings = new SavingsAccount("Your Name"); 11. Add this code to the Form1_Load method to initialize the accounts: Visual Basic Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Me.account.Items.Add(checking) Me.account.Items.Add(savings) Me.account.SelectedIndex = 0 Me.action.SelectedIndex = 0 Me.amount.Text = "100" End Sub // Visual C# private void Form1_Load(object sender, System.EventArgs e) { this.account.Items.Add(checking); this.account.Items.Add(savings); this.account.SelectedIndex = 0; this.action.SelectedIndex = 0; this.amount.Text = "100"; } In the designer, you used the String Collection Editor dialog box to add strings to the ComboBox control. You can add any item to the ComboBox using the Items.Add method. At run time, the name of the class will be displayed in the ComboBox control, as shown in the following screen. If you have defined a ToString method for the class, the ToString method would be called and displayed in the ComboBox. For example, if you had defined a ToString method in the SavingsAccount object that returned the ID property, the ComboBox would display Your Name-S instead of TheBank.SavingsAccount.
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Submit the transaction 1. In the designer, double-click the Submit button to create the Click event method in the code editor. 2. Add this code to the code editor to submit the transaction and report the new account balance: 3. 4. 5. 6. 7. Visual Basic Private Sub submit_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles submit.Click Dim selectedAccount As BankAccount Dim item As Object = Me.account.SelectedItem
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8. 9. 10. 11. 12. 13. 14. 15. 16. 18.
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selectedAccount = CType(item, BankAccount) Select Case action.Text Case "Deposit" selectedAccount.Deposit(Decimal.Parse(amount.Text)) Case "Withdraw" selectedAccount.Withdraw(Decimal.Parse(amount.Text)) End Select MessageBox.Show(String.Format("{0}: {1:C}", _ selectedAccount.ID, selectedAccount.Balance))
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17. End Sub 19. // Visual C# 20. private void submit_Click(object sender, System.EventArgs e) { 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. } MessageBox.Show(String.Format("{0}: {1:C}", selectedAccount.ID, selectedAccount.Balance)); BankAccount selectedAccount; object item = this.account.SelectedItem; selectedAccount = (BankAccount)item; switch (action.Text) { case "Deposit" : selectedAccount.Deposit(decimal.Parse(amount.Text)); break; case "Withdraw" : selectedAccount.Withdraw(decimal.Parse(amount.Text)); break;
} As with the SortedList and ArrayList classes, you can add any type of object to the ComboBox, but the ComboBox treats them all as being of type System.Object. (Remember that all classes implicitly derive from System.Object.) That means that what is returned from ComboBox.SelectedItem can be directly assigned only to a System.Object reference. Because your code has control over the Account combo box, you have restricted the items of the combo box to be of type CheckingAccount or SavingsAccount. Therefore you can cast the System.Object item in the submit_Click method to a BankAccount object. Once you have a BankAccount object, you can call any of its properties and methods. When you cast an object from one type to another, no changes occur in the instance itself. The only thing that changes is the view of the object. The preceding code doesn t convert account.SelectedItem from a System.Object into a SavingsAccount object. The cast only directs the compiler to treat the instance as a SavingsAccount instead of a System.Object. There is, after all, only one instance of SavingsAccount. It s just that the account combo box is storing a System.Object reference to it, and the Form is storing a SavingsAccount reference to it. When you have a base class reference to an instance, you can access only the properties and methods defined on the base class. In this example, you
couldn t call the AddInterest method using the selectedAccount variable. You ll see how to do that in the next section. 34. Press F5 to run the application. Make some deposits and withdrawals with the accounts, and you ll see the common and specialized behaviors of the CheckingAccount and SavingsAccount classes. Find the type of the object 1. Open Form1 in the designer. 2. Add another button to Form1. Set its Name property to addInterest, its Text property to Add interest, and its Visible property to False. 3. Double-click the button to create the Click event method in the code editor. 4. In the form designer, double-click the account ComboBox control to create the account_SelectedIndexChanged method in the code editor. 5. Add the following code to the account_SelectedIndexChanged method to display the Add Interest button if the selected account is the savings account. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. } } else { addInterest.Visible = false; // Visual C# private void account_SelectedIndexChanged(object sender, System.EventArgs e) { if (account.SelectedItem is SavingsAccount) { addInterest.Visible = true; Visual Basic Private Sub account_SelectedIndexChanged(ByVal sender As _ System.Object, ByVal e As System.EventArgs) _ Handles account.SelectedIndexChanged If TypeOf (account.SelectedItem) Is SavingsAccount Then addInterest.Visible = True Else addInterest.Visible = False End If End Sub
26. } 27. Add the following code to the Click event method of the Add Interest button to call the AddInterest method of SavingsAccount. 28. Visual Basic 29. Private Sub addInterest_Click(ByVal sender As System.Object, _ 30. ByVal e As System.EventArgs) Handles addInterest.Click 31. 32. 33. 34. 35. If TypeOf (account.SelectedItem) Is SavingsAccount Then Dim theSavings As SavingsAccount = _ CType(account.SelectedItem, SavingsAccount) theSavings.AddInterest() MessageBox.Show(String.Format("{0}: {1:C}", _
36. 37. 39.
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