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DictionaryBase This data structure provides for pairs of speci c types of object (typically, a
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the capacity is reached, the next Add() operation will extend the capacity by doubling it Typically, we would use an ArrayList in a situation where we did not know how many data items were to be accommodated For example, the earlier shopping list sample program can be made much simpler using an ArrayList (Listing 621)
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Sub Main() Dim l As ArrayList = New ArrayList() Dim item As String Do ConsoleWrite("Enter shopping list item: ") item = ConsoleReadLine() If item = Nothing Then Exit Do
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End If lAdd(item) Loop For Each item In l ConsoleWriteLine(item) Next lSort() ConsoleWriteLine("Number of items: {0}", lCount()) ConsoleWriteLine("Current capacity: {0}", _ lCapacity()) ConsoleWriteLine("Sorted:") For Each item In l ConsoleWriteLine(item) Next End Sub Listing 621: Using an ArrayList for a shopping list
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Note that we use the Sort() operation very differently with an ArrayList Recall that when sorting a simple array, we used the syntax:
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ArraySort(names)
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where names is the array identi er This indicates that we were actually passing our array to a method of the array class (a shared method) for sorting With an ArrayList, the Sort() operation is much more straightforward simply execute the ArrayList s own Sort() method If we wanted to use an ArrayList to manage items of a user-de ned class, we could not assume that it would know what rules to apply to sort them into order (as with an array of class objects) In this case, the Sort() method would have to use the class s own CompareTo() method as with the array sorting example; we would signal this to the ArrayList by passing a parameter the value Nothing to the Sort() method The ArrayList class is a good, general purpose data structure class I ve found it useful in situations where the additional coding required to implement resizable arrays is too onerous
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Exercise 66
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a) b) c)
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Amend the Employee class used in Exercise 65, so that the class also stores room number and oor; modify the constructor appropriately Create an ArrayList of employees, and provide functions for looking up phone number, room number and oor number, given the employee s name Write an AddEmployee function that will accept employee data and create and store a new employee Make the function reject new employees where the supplied phone number, or combination of room number and oor number clashes with those of an existing employee the function should return True if the Add operation was successful, False otherwise
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632 HashTables
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A HashTable is a form of Dictionary, derived from the DictionaryBase class Dictionary collections store pairs of objects, usually referred to as Key and Value pairs In the same way that a real-world dictionary provides us with a way to associate pairs of items (a word and its de nition or translation), so a Dictionary collection allows us to associate pairs of objects Normally, the Key object is a value that would be looked up (like looking up a word in the Oxford English Dictionary) and the Value object is the object that is returned from the look-up In this way, we can build complex structures that allow us to collect pairs of objects, where one is used as a way of accessing the other Typically, the Key of an entry in a Dictionary collection is a string that uniquely identi es the Value object; for example we could use a person s social security number as the key to an object containing other data referring to the person, or a licence number as the key to an object containing a lot of data about a speci c car A HashTable gets its name from the way data is stored and retrieved in it A hashing function, or hash function, is a function that takes some data, jumbles it up and converts it into a number that is seemingly random This type of function, fairly useless on its own, is ideal for distributing a lot of key values evenly across a numeric range To see why this is useful, consider the job done by a local post of ce sorting of ce Mail is arranged into bins, where each bin contains mail for a particular area Since the actual areas (normally a postman s walk ) can be selected by the post of ce, they are organized so that each area (and bin) will be approximately the same size, and will therefore receive a similar amount of mail This is organizationally sensible Now consider a situation where we cannot predetermine how items would be distributed Organizing items into bins by the initial letter of someone s surname, for example, would be more haphazard We call the property or piece of data that we use to identify an item its key and although the aim is to have an even distribution of keys, this is unlikely for real-world data We would not divide the population of a country into 26 groups, where each group is of people with the same initial letter to their surname, and expect each group to be the same size If we used the initial letter of a surname, for example, we would have 26 bins, one for each letter A to Z (see Figure 64) However, each bin would not be likely to have to accommodate a similar amount of mail In the UK, names beginning with certain letters are quite unlikely (X and Z for example) These two bins would be nearly
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