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Notice that Example 7-10 uses the new keyword to initialize each object. This highlights an important point about arrays: individual array elements are similar to variables of the same type. Recall from 3 that a custom type defined with the class keyword, such as the CalendarEvent type in Example 7-9, is a reference type. This means that when you declare a variable of that type, the variable does not represent a particular object it s a storage location that can refer to an object. And the same is true of each element in an array if the element type is a reference type. Figure 7-1 shows the objects that Example 7-10 creates: five CalendarEvent objects (shown on the right), and an array

object of type CalendarEvent[] (shown on the left) where each element in the array refers to one of the event objects.

As you saw in 3, with reference types multiple different variables can all refer to the same object. Since elements in an array behave in a similar way to local variables of the element type, we could create an array where all the elements refer to the same object, as shown in Example 7-11.

CalendarEvent theOnlyEvent = new CalendarEvent { Title = "Swing Dancing at the South Bank", StartTime = new DateTimeOffset (2009, 7, 11, 15, 00, 00, TimeSpan.Zero), Duration = TimeSpan.FromHours(4) }; CalendarEvent[] events = { theOnlyEvent, theOnlyEvent, theOnlyEvent, theOnlyEvent, theOnlyEvent };

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System.err.println ("Warning: Could not load password file."); } return userMap; } } /** This class supports a password file that stores hashed (but not salted) passwords. */ class HashedPasswordFile { /* the delimiter used to separate fields in the password file */ public static final char DELIMITER = ':'; public static final String DELIMITER_STR = "" + DELIMITER; /* We assume that DELIMITER does not appear in username and other fields. */ public static Hashtable load(String pwdFile) { Hashtable userMap = new Hashtable(); try { FileReader fr = new FileReader(pwdFile); BufferedReader br = new BufferedReader(fr); String line; while ((line = br.readLine()) != null) { int delim = line.indexOf(DELIMITER_STR); String username = line.substring(0,delim); String hpwd = line.substring(delim+1); userMap.put(username, hpwd); } } catch (Exception e) { System.err.println ("Warning: Could not load password file."); } return userMap; } public static void store(String pwdFile, Hashtable userMap) throws Exception { try { FileWriter fw = new FileWriter(pwdFile); Enumeration e = userMap.keys(); while (e.hasMoreElements()) { String uname = (String)e.nextElement(); fw.write(uname + DELIMITER_STR + userMap.get(uname).toString() + ""); } fw.close(); } catch (Exception e) { e.printStackTrace(); } } }

Figure 7-2 illustrates the result. While this particular example is not brilliantly useful, in some situations it s helpful for multiple elements to refer to one object. For example, imagine a feature for booking meeting rooms or other shared facilities this could be a useful addition to a calendar program. An array might describe how the room will be used today, where each element represents a one-hour slot for a particular room. If

the same individual had booked the same room for two different slots, the two corresponding array elements would both refer to the same person.

Another feature that reference type array elements have in common with reference type variables and arguments is support for polymorphism. As you saw in 4, a variable declared as some particular reference type can refer to any object of that type, or of any type derived from the variable s declared type. This works for arrays too using the examples from 4, if an array s type is FirefighterBase[], each element could refer to a Firefighter, or TraineeFirefighter, or anything else that derives from FirefighterBase. (And each element is allowed to refer to an object of a different type, as long as the objects are all compatible with the element type.) Likewise, you can declare an array of any interface type for example, INamedPerson[], in which case each element can refer to any object of any type that implements that interface. Taking this to extremes, an array of type object[] has elements that can refer to any object of any reference type, or any boxed value. As you will remember from 3, the alternative to a reference type is a value type. With value types, each variable holds its own copy of the value, rather than a reference to some potentially shared object. As you would expect, this behavior carries over to arrays when the element type is a value type. Consider the array shown in Example 7-12.

int[] numbers = { 2, 3, 5, 7, 11 };

Abelson, Harold, Ross Anderson, Steven Bellovin, Josh Benaloh, Matt Blaze, Whitfield Die, John Gilmore, Peter G Neumann, Ronald L Rivest, Jeffrey I Schiller, and Bruce Schneier 1998 The risks of key recovery, key escrow, and trusted third party encryption Center for Democracy and Technology wwwcdtorg/crypto/risks98 Anderson, Kevin 2001 White House website attacked BBC News Online, May 5 http://newsbbccouk/1/hi/world/americas/1313753stm Anley, Chris 2002 Advanced SQL injection in SQL Server applications Next Generation Security Software, wwwngssoftwarecom/papers/advanced_sql_injectionpdf Balenson, David M, Carl M Ellison, Steven B Lipner, and Steven T Walker 1994 A new approach to software key escrow encryption In Building in big brother: The cryptographic policy debate, 180 207 New York: Springer-Verlag Bellare, Mihir, and Shafi Goldwasser Verifiable partial key escrow 1997 In Proceedings of the 4th ACM Conference on Computer and Communications Security, 78 91 New York: ACM Press Bellovin, Steven M.

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