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The keywords public and private are known as access modifiers, which are used to specify what methods of which classes can access particular members. For instance, public members can be called from methods in any class, whereas private members are visible only to the methods of the class defining the member. Thus, objects of any class can call Bark on an instance of Dog, but only methods of the Dog class have access to the weight and name of a Dog. We discuss access modifiers in 7.

The FeedbackToFile method works like the FeedbackToConsole and FeedbackToMsgBox methods except that it opens a file and appends the processing item string to the end of the file. Again, the purpose of this example is to demonstrate that delegates can wrap calls to instance methods as well as static methods. For instance methods, the delegate needs to know the instance of the object that the method is going to operate on.

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up calling the overload that takes an Object . Passing a value type instance as an Object will cause boxing to occur, which will adversely affect performance . If you are defining your own class, you can define the methods in the class to be generic (possibly constraining the type parameters to be value types) . Generics give you a way to define a method that can take any kind of value type without having to box it . Generics are discussed in 12 . One last point about boxing: if you know that the code that you re writing is going to cause the compiler to box a single value type repeatedly, your code will be smaller and faster if you manually box the value type . Here s an example:

The Timer class also offers a Dispose method which allows you to cancel the timer altogether and optionally signal the kernel object identified by the notifyObject parameter when all pending callbacks for the time have completed . Here is what the Dispose method overloads look like:

IF YOU VE E VE R MADE a phone call or used a bank ATM, you ve already experienced us-

discriminator-column Used to define the discriminator column used for defining entity inheritance strategies. It is equivalent to the @DiscriminatorColumn annotation.

price) price) price) price) price) price) price) price) price) price)

public class EnterpriseClient extends MIDlet implements CommandListener { private Form outputForm = new Form("Server Messages"); private Form inputForm = new Form("Input Message"); Set up the private TextField msgFld = application new TextField("Msg", "Test", 15, TextField.ANY); private Command okCmd = new Command("OK", Command.OK, 1); private Command exitCmd = new Command("Exit", Command.EXIT, 1); private Command sendCmd = new Command("Send", Command.SCREEN, 1); private Display display; private String sessionId;

The CLR needed to provide this concept of foreground and background threads to better support AppDomains . You see, each AppDomain could be running a separate application and each of these applications would have its own foreground thread . If one application exits, causing its foreground thread to terminate, then the CLR still needs to stay up and running so that other applications continue to run . After all the applications exit and all their foreground threads terminate, the whole process can be destroyed . The following code demonstrates the difference between foreground and background threads:

a private virtual circuit (PVC) It hooks directly to the far network destination OSPF will consider several factors to determine which link to use If OSPF were to use the shortest path, Path Y with the 56 Kbps FR link would appear to be the choice because it has fewer hops On the other hand, even though Path X has more hops on it, it is definitely the fastest route to take, making it the more desirable link, because it has a lower weight assessed to it When the routing protocol is evaluating choices on the network, the protocol will apply a weight to every path The path with the lowest weight is the one chosen for the traffic.

From the listing above, you can see that Room doesn t need the discriminator value. Instead, each joined subclass has to specify a key column, which joins back to the superclass table, in this case, room_id. And while it s currently not stated in the XDoclet documentation, a table attribute is available that lets you specify which table the subclasses map to.

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