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assertions rather than normal checks If you are using a release of the platform that supports assertions (14 or later), you should use the assert construct; otherwise you should use a makeshift assertion mechanism It is particularly important to check the validity of parameters that are not used by a method but are stored away for later use For example, consider the static factory method on page 86, which takes an int array and returns a List view of the array If a client of this method were to pass in null, the method would throw a NullPointerException because the method contains an explicit check If the check had been omitted, the method would return a reference to a newly created List instance that would throw a NullPointerException as soon as a client attempted to use it By that time, unfortunately, the origin of the List instance might be very difficult to determine, which could greatly complicate the task of debugging Constructors represent a special case of the principle that you should check the validity of parameters that are to be stored away for later use It is very important to check the validity of parameters to constructors to prevent the construction of an object that violates class invariants There are exceptions to the rule that you should check a method's parameters before performing its computation An important exception is the case in which the validity check would be expensive or impractical and the validity check is performed implicitly in the process of doing the computation For example, consider a method that sorts a list of objects, such as Collectionssort(List) All of the objects in the list must be mutually comparable In the process of sorting the list, every object in the list will be compared to some other object in the list If the objects aren't mutually comparable, one of these comparisons will throw a ClassCastException, which is exactly what the sort method should do Therefore there would be little point in checking ahead of time that the elements in the list were mutually comparable Note, however, that indiscriminate application of this technique can result in a loss of failure atomicity (Item 46) Occasionally, a computation implicitly performs the required validity check on some parameter but throws the wrong exception if the check fails That is to say, the exception that the computation would naturally throw as the result of an invalid parameter value does not match the exception that you have documented the method to throw Under these circumstances, you should use the exception translation idiom described in Item 43 to translate the natural exception into the correct one Do not infer from this item that arbitrary restrictions on parameters are a good thing On the contrary, you should design methods to be as general as it is practical to make them The ewer restrictions that you place on parameters, the better, assuming the method can do something reasonable with all of the parameter values that it accepts Often, however, some restrictions are intrinsic to the abstraction being implemented To summarize, each time you write a method or constructor, you should think about what restrictions exist on its parameters You should document these restrictions and enforce them with explicit checks at the beginning of the method body It is important to get into the habit of doing this; the modest work that it entails will be paid back with interest the first time a validity check fails. vb.net barcode reader source code How to read input from a barcode scanner in vb . net without using a ...
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It enables developers to quickly and easily add barcode generation and recognition functionality to their Microsoft . NET applications (ASP. NET , WinForms and Web Service) and it supports in C#, VB . NET . Spire. Barcode for . NET is 100% FREE barcode component. Drives. Data Matrix Generator In .NET Using Barcode encoder for ASP . Control to generate, create Data Matrix 2d barcode image in a href="http://ASP.NET">ASP. Again, we must remember that a page will contain several rows; we may be interested in all of these rows, just a few of them, or even only a single row the cost will be the same, roughly 10 ms. f the disk drives are heavily used, this gure might be considerably increased as a result of having to wait for the disk to become available. In computing terms, 10 ms is an eternity, which is why we will be so interested in this activity throughout this book. It isn t really necessary to understand how this 10 ms is derived, but for those readers who like to understand where numbers such as this come from, Figure 2.3 breaks it down into its constituent components. From this we can see that we are assuming the disk would actually be busy for about 6 out of the 10 ms. The transfer time of roughly 1 ms refers to the movement of the page from the disk server cache into the database buffer pool. The other 3 ms is an estimate of the queuing time that might arise, based on disk activity of, say, 50 reads per second. These sort of gures would equally apply to directly attached drives; all the gures will, of course, vary somewhat, but we simply need to keep in mind a rough, but not unreasonable, gure of 10 ms.Related: EAN-13 Generator .NET , EAN 128 Generation .NET , .NET UPC-A Generation Note that the defensive copy is performed prior to the validity check and that we did not use Date's clone method to perform the defensive copy Both of these details are required to protect Period against attack (Item 24) Note also that defensive copying is not possible for final fields To use the readObject method, we must make the start nd end fields nonfinal This is unfortunate, but it is clearly the lesser of two evils With the new readObject method in place and the final modifier removed from the start and end fields, the MutablePeriod class is rendered ineffective The above attack program now generates this output:. Effective Java: Programming Language Guide. QR-Code Maker In . 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Make Code39 In .NET Using Barcode creator for .Related: Modern x86 CPUs such as the Pentium can address much more memory than this and have a lot of machinery that I won't be discussing in this book With the 8086 and 8088 CPUs, the 20 address lines and 1 megabyte of memory was literally all they had They didn't speak of the real mode segmented model back in the 8088 era because that one model was all there was More powerful memory models didn't really come about until the appearance of the 80386 in 1986 The 386 was Intel's first true 32-bit CPU, and the first to fully implement a 32-bit protected mode The 80286 was a transitional CPU that tried but did not completely succeed in implementing a protected mode People simply used it as a faster 8088 (Later on, I talk more about what the "protected" in "protected mode" means) The 386 and later Intel CPUs could address 4 gigabytes of memory without carving it up into smaller segments In the 32-bit CPUs, a segment is 4 gigabytes so one segment is, for the most part, plenty However, a huge pile of DOS software written to make use of segments was everywhere around and had to be dealt with So, to maintain backward compatibility with the ncient 8086 and 8088, newer CPUs were given the power to limit themselves to what the older chips could address and execute When a Pentium CPU places itself into real mode segmented model, it very nearly becomes an 8086 This may seem a waste, but it allows the Pentium to run old DOS software originally written for the 8086 Think of it as training wheels to get you up to speed in assembly language Whenever a newer CPU such as the 386 or Pentium is set up to look like an 8086, we say that it is in real mode The term real mode was coined as a contrast to protected mode, which is the much more powerful mode used in newer operating systems (such as Windows 9x and NT, as well as Linux) that allows the operating system much more control over what programs running on the machine can do. vb.net barcode scanner source code Barcode Generator & Scanner in VB 2015 - YouTube
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