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The fundamental reason for using design patterns is to keep classes separated and prevent them from having to know too much about one another Equally important, these patterns help you to avoid reinventing the wheel and allow you to describe your programming approach succinctly in terms that other programmers can easily understand Recently, we obtained from a colleague some code that had been written by a very capable summer student However, in order to use it in our project, we had to reorganize the objects to use the Java Foundation Classes (JFCs) We offered the revised code back to our colleague and were able to summarize our changes simply by noting that we had converted the toolbuttons to Command patterns and had implemented a Mediator pattern to process their actions This is exactly the sort of concise communication that using design patterns promotes OO programmers use a number of strategies to achieve the separation of classes, among them encapsulation and inheritance Nearly all languages that have OO capabilities support inheritance A class that inherits from a parent class has access to all of the methods of that parent class It also has access to all of its nonprivate variables However, by starting your inheritance hierarchy with a complete, working class, you might be unduly restricting yourself, as well as carrying along specific method implementation baggage Instead, Design Patterns suggest that you always Program to an interface and not to an implementation Putting this more succinctly, you should define the top of any class hierarchy with an abstract class or an interface, which implements no methods but simply defines the methods that the class will support Then, in all of your derived classes you will have more freedom to implement these methods to best suit your urposes The other major concept that you should recognize is object composition This is simply the construction of objects that contain other objects, that is, encapsulation of several objects inside another one While many beginning OO programmers use inheritance to solve every problem, as you begin to write more elaborate programs, the merits of object composition become apparent Your new object can have the interface that is best for what you want to accomplish without. 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Make EAN-13 In Java Using Barcode generation for .Figure 1110 shows a flowchart for the print events during a printing process The BeginPrint event is raised after the Print method is called Then the printing process checks if there are any pages If there are, the PrintPage event occurs, which is responsible for the actual printing, and the control goes back to check if there are more pages to print When all pages are done printing, the EndPage event is fired The PrintEventArgs class provides data forBeginPrint and EndPrint events This class is inherited from CancelEventArgs, which implements a single property called Cancel, that indicates if an event should be canceled (in the current NET Framework release, PrintEventArgs is reserved for future use) The BeginPrint event occurs when thePrint method is called and before the first page prints BeginPrint takes a PrintEventArgs object as an argument This event is the best place to nitialize resources The PrintEventHandler method, which is used to handle the event code, is called whenever the BeginPrint event occurs The PrintPage event occurs when thePrint method is called and before a page prints When we create aPrintPageEventHandler delegate, we identify a method that handles the PrintPage event The event handler is called whenever the PrintPage event occurs The code snippet that follows creates a PrintPageEventHandler delegate, where pd_PrintPage is an event handler:.Related: Print PDF417 C# , Excel Intelligent Mail Generation , Code 39 Generator VB.NET If true, display the start and stop char (*) in the begining and end of barcode value. td> . processTilde, process-tilde, false, Set the processTilde property to . ~ NNN: is used to represent the ASCII character with he value of NNN. 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