asp net core 2.1 barcode generator

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You begin the interface command with the @interface directive and end it with the @end directive. Note that the @interface directive includes not only the class name but also the name of its superclass, following a colon. It could also include a list of protocols, a topic we ll return to later in this section. The variable declaration B is entirely normal. NSString is a type that you ll meet when we look at the iPhone OS later in this chapter. Note that you don t have to declare all your variables in your @interface just those instance variables that you want to be accessible outside their methods. You ll declare variables that are used within only individual methods inside those methods, as you d expect. The method declaration C contains a typed description of a method with one argument, matching the syntax you ve seen for messages. It also contains one other new element: it starts with a hyphen ( ). That means this is an instance method, which is a method that can only be used by an instance object. Its opposite number, which is marked with a plus (+), is the class method, which is used by a class object. The id type used as the return of growFruit is another Objective-C innovation. Objective-C allows for dynamic typing, where type is decided at runtime. To support this, it includes the weak type of id, which can be a pointer to any object. Before we finish our discussion of method declarations, we d like to mention that, as with variables, you only have to declare those methods that can be called externally. Methods that remain internal to a class can remain hidden if you desire.

class MyException extends Exception { } class FooException extends MyException { } class BooException extends MyException { } public class TestException { public void go() throws MyException { // Usually BAD to do this boolean x = true; if(x) { throw new FooException(); } else { throw new BooException(); } } }

The year of 1878 was the year of male operators, who seem to have been an instant and memorable disaster. The lads, most of them in their late teens, were simply too impatient and high-spirited for the job, which, in view of the imperfections of the equipment and the inexperience of the subscribers, was one demanding above all patience and calm. According to the late reminiscences of some of them, they were given to lightening the tedium of their work by roughhousing, shouting constantly at each other, and swearing frequently at the customers. An early visitor to the Chicago exchange said of it,

In the preceding code, class TestException declares a method go() that declares a MyException. But in reality, it might throw a BooException or it might throw a FooException. This is perfectly legal, of course, since both exceptions are subclasses of the declared exception. But why bother throwing two different exceptions if you don t declare it Surely you don t want to force the catcher to insert logic to figure out what kind of exception they got This doesn t mean that catch code won t sometimes do this, but it should be up to the catcher, not the thrower, to make that choice.

After you ve declared a class with an @interface, you can then define it with the @implementation directive. Here s a brief example of what the implementation might look like for the AppleTree class, including a single example method:

That wraps up our look at clarity and maintenance issues, and here s a list of the key points. Cut it out and tape it to your wall next to all the other incredibly valuable pages you ve ripped from this book and taped to your wall. We re thinking of just offering wallpaper so you can leave your book intact.

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

Avoid designing a class that has no methods. Use design patterns. Reduce the visibility of things as much as possible. Use overloading rather than logic. Avoid long argument lists.

/* AppleTree.m */ #import "AppleTree.h" #import "Apple.h" @implementation AppleTree - (id)growFruit:(NSString *)appleColor { Apple *fruit = [Apple appleWithColor:appleColor]; return fruit; } @end

Don t invoke potentially overridable methods from a constructor. Code to interfaces. Use abstract classes when you need implementation functionality. Make objects you re finished with eligible for garbage collection. Don t make more objects than you need to. Avoid deeply nested and complex logic. Use getters and setters that follow the JavaBean naming convention. Don t be a procedural programmer in an OO world. Make variable and method names as self-explanatory as possible. Make your own Exception classes if you can t find one in the API to

Four factors influence the richness of the video signal. They are the frame rate, color resolution, image quality, and spatial resolution. Frame rate is a measure of the refresh rate of the actual image painted on the screen. The NTSC video standard is 30 frames per second, meaning that the image is updated 30 times every second. Each frame consists of odd and even fields. The odd field contains the odd-numbered screen lines, while the even field contains the even-numbered screen lines that make up the picture. Television sets paint the screen by first painting the odd field and then the even. They repeat this process at the rate of 60 fields, or 30 frames, per second. The number 60 is chosen to coincide with the frequency of electricity in the U.S. By the same token, PAL relies on a scan rate that is very close to 50 Hz, the standard in Europe. This odd-even alternation of fields is called interlaced video.

Hide implementation details. Use appropriate class granularity. Use appropriate method granularity. Use encapsulation.