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When deciding what parameters to pass to a method, you should avoid using flags or control parameters that tell the method how to perform its function. For example, assume you re responsible for a Roster class that maintains a list of students. In addition, let s assume a limit exists to the number of students that can normally be included on the roster. However, in some cases, you want to be able to override that maximum, so you might create a class like the one shown in Listing 2-11. Listing 2-11. Initial Roster Implementation import java.util.Vector; public class Roster { protected int capacity; protected Vector students; public Roster(int max) { capacity = max; students = new Vector(); } /**

Adams Arthur That query performed as expected. However, we ll intentionally introduce an error. The following code will attempt to index into the fifth character of each president s name. When the enumeration reaches an element whose length is less than five characters, an exception will occur. Remember, though, that the exception will not happen until the output sequence is enumerated. Listing 3-3 shows the sample code.

Figure 7 27. The Breakpoints group on the Filters tab A few automatic breakpoint configurations are built into the Automatic Breakpoint submenu under Rules. Only one may be used at a time. Fiddler can be set to break before requests or after responses, or to never automatically break. This menu, shown in Figure 7 28, also provides a way to ignore images when automatically breaking.

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* Attempts to add the student name to the Vector that is used to * maintain the list There is a capacity value that normally will * limit the number of students that can be on the list, but the * caller can override that constraint if the student has been * given permission from their advisor to add the class even though * it's already full * * @param name Student to add to the list * @param allowExcess Override capacity check when adding student * @return <code>true</code> if the student was added * to the list, <code>false</code> otherwise */ public boolean addStringToVector(String name, boolean allowExcess) { if (!allowExcess) { if (studentssize() >= capacity) { return false; } } studentsaddElement(name); return true; } } At first glance, this method may appear to be reasonably well-designed, but in fact, it possesses a number of undesirable characteristics.

string[] presidents = { "Adams", "Arthur", "Buchanan", "Bush", "Carter", "Cleveland", "Clinton", "Coolidge", "Eisenhower", "Fillmore", "Ford", "Garfield", "Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson", "Jefferson", "Johnson", "Kennedy", "Lincoln", "Madison", "McKinley", "Monroe", "Nixon", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"}; IEnumerable<string> items = presidents.Where(s => Char.IsLower(s[4])); Console.WriteLine("After the query."); foreach (string item in items) Console.WriteLine(item); This code compiles just fine, but when run, here are the results: After the query. Adams Arthur Buchanan Unhandled Exception: System.IndexOutOfRangeException: Index was outside the bounds of the array. Notice the output of After the query. It isn t until the fourth element, Bush, was enumerated that the exception occurred. The lesson to be learned is that just because a query compiles and seems to have no problem executing, don t assume the query is bug-free. Additionally, because these types of queries, those returning IEnumerable<T>, are deferred, you can call the code to define the query once but use it multiple times by enumerating it multiple times. If you do this, each time you enumerate the results, you will get different results if the data changes. Listing 3-4 shows an example of a deferred query where the query results are not cached and can change from one enumeration to the next.

For one thing, it requires callers to pass a parameter that indicates whether the student should be added when the capacity value has already been reached This makes the method less cohesive, because it not only has responsibility for adding the student s name to the Vector but it also must determine whether it s acceptable to add the student Given that the method isn t cohesive, how can you improve it Well, 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 2-12.

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