n Data and Object Structures in Visual Basic .NET

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Else ConsoleWriteLine("Class full!") Exit Do End If Loop 'Now let's report of the group ConsoleWriteLine("Statistics:") ConsoleWriteLine("Average mark is : {0}", _ GroupAverageMark()) GroupMaxStudentReport() GroupMinStudentReport() ConsoleWriteLine("The group in order of marks:") 'Finally, let's see a sorted list Dim students As Array Dim index As Integer students = GroupSortedList For index = 0 To studentsGetUpperBound(0) If Not students(index) Is Nothing Then ConsoleWriteLine("{0}: {1}", _ students(index)name, students(index)mark) End If Next End Sub Listing 618: Working with the StudentArray class
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Visual Basic provides a somewhat more elegant way to create an encapsulated array of a speci c type of object, based on inheriting the standard array class and amending some of the methods and members to deal with the speci ed class We ll come back to this in the next chapter (on inheritance and other object-oriented structuring techniques)
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Exercise 65 (Major programming exercise)
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Create a class, Employee, that stores the name and phone number of an employee, making both accessible as properties The class should have a constructor that takes the name and number as parameters Declare an array similar in dimensions to that used in Exercise 63, but make it an array of employees Create a function to allow an employee s phone number to be looked up, given their name Create a sub that will return (in output parameters) the oor and room number of an employee given their name
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628 Changing the size of an array
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A limitation of the arrays we have seen so far is that they are declared to have a speci c number of elements If we declare an array for a group of 20 students
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62 Arrays
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in a program and then, while using the program, a 21st student comes along to join the class, we seem to have a problem Visual Basic lets us get around this by re-dimensioning an array as a program runs Consider the example of a shopping list whose size we can not predict (Listing 619)
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Sub Main() Const initialSize = 5 Const sizeIncrement = 3 Dim list(initialSize) As String Dim item As String Dim numItems As Integer Do ConsoleWrite("Enter shopping list item:") item = ConsoleReadLine() If item = Nothing Then Exit Do End If numItems += 1 If listGetLength(0) < numItems Then ReDim Preserve list(listGetUpperBound(0) + _ sizeIncrement) ConsoleWriteLine("List increased to : {0}", _ listGetLength(0)) End If list(numItems 1) = item Loop ConsoleWriteLine() For Each item In list ConsoleWriteLine(item) Next End Sub Listing 619: Re-dimensioning an array
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In Listing 619, we start with an array of six strings (Dim list(initialSize) As String, where initialSize is 5, giving us elements (0) to (5)) Let s assume that this would be the length of our normal shopping list Items are added to the list as normal (collecting the name of the next entry in the variable item, and then assigning this to the array if it is not an empty string) Provided there are six or fewer items, this is all that is needed for the data collection step, and we would go on to print out the list (in the ForEach structure) If we decide to throw a party, we ll probably need to increase the length of our shopping list The variable numItems is keeping count of the number of items in the shopping list We can test whether numItems has reached the maximum the array can cope with using the GetLength() method of the array class (we could also have used GetUpperBound(), but GetLength() returns the actual number, including element 0, so is easier to use in this situation) If the array has no more space, we resize it:
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ReDim Preserve list(listGetUpperBound(0) + sizeIncrement)
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