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use it. If we amortize the cost of the new system over 3 years and add in the operating costs, the results look something like Table 11-2. Let s suppose that you have a business-to-business company with several thousand customers but that you apply the costs of the new system only to your best 1000 customers. We will charge the total cost of the system against these best customers, even though many others will probably use it. Table 11-3 gives the base lifetime value of these 1000 customers before we introduce the new system. On average, each of these 1000 best customers spends $28,000 per year with you. It costs $400 to acquire each of these customers, and you are spending $50 per year on marketing costs to maintain relationships with them. After 3 years, the LTV is over $16,000. If the new system is successful, it will create two changes in customer behavior. Those who adopt the new system will be more loyal. The retention rate will rise from 70 percent to 75 percent. In addition, Table 11-2 Yearly Costs

You will notice that some of the items I put into the SortedSet<string> at construction are missing. This happens because the SortedSet<T> class doesn t accept duplicate entries and uses the IComparer<T> to determine which items have the same value. Since my implementation of IComparer<string> works on the length of the string, any strings that have the same number of characters are assumed to be equal. You have to be a little careful when providing your own IComparer<T> that you understand how the collection class performs comparisons.

The IEqualityComparer<T> interface is used by the Dictionary<TKey, TVal> class to determine if keys are equal. The interface has two methods, which are described in Table 19-32. Table 19-32. The Methods of the IEqualityComparer<T> Interface

Equals(T, T)

The final method of SplashScreen worth mentioning is the close() method. To close the screen and release its resources before an AWT (or Swing) window is shown, you can call this method. Calling isn t necessary, though, as the method will be called automatically when the top-level window becomes visible.

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