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By Anthony J. Field

Ebook through box, Anthony J., Harrison, Peter

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For starters, you should eliminate the allowExcess flag, since it’s used as a way for the caller to communicate with the method concerning how the method should operate. You should avoid using parameters for that purpose, since they tend to make the function of your method less clear and cohesive. In this example, a better solution is to create a separate method that always ignores the capacity value and remove the allowExcess flag, as shown in Listing 2-15. Listing 2-15. *; public class Roster { protected int capacity; protected List students; public Roster(int max) { capacity = max; students = new List<>(); } /** * Adds the student name to the List that is used to maintain the * list.

Size() >= capacity) { return false; } addStringToList(name); return true; } } 54 Chapter 2 ■ Designing Libraries, Classes, and Methods This is an improvement over the original design, as there’s more cohesion in these two methods than in the original one. Instead of passing a flag to the method as in the previous implementation, the caller can now call the method that provides the desired behavior. Notice that conditionalAddStringToList() doesn’t actually add the student but instead calls addStringToList().

You’ve already removed one dependency by preventing SampleTextFrame from building a new Font instance based on the properties in the panel, but dependencies still exist. For example, in the createComponents() method, an instance of FontPropertiesPanel is created. In addition, the SampleTextFrame constructor makes calls to the panel’s getSelectedFont() and getFontListener() methods. Let’s assume that SampleTextFrame will always contain a JPanel subclass called propertiesPanel but that you don’t want to couple it specifically to FontPropertiesPanel.

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