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This item is a grab bag of API design hints that don't quite deserve items of their own Taken together, they'll help make your API easier to learn and use and less prone to errors Choose method names carefully Names should always obey the standard naming conventions (Item 38) Your primary goal should be to choose names that are understandable and consistent with other names in the same package Your secondary goal should be to choose names consistent with the broader consensus, where it exists When in doubt, look to the Java library APIs for guidance While there are plenty of inconsistencies inevitable, given the size and scope of the libraries there is also consensus An invaluable resource is Patrick Chan's The Java Developers Almanac [Chan00], which contains the method declarations for every single method in the Java platform libraries, indexed alphabetically If, for example, you were wondering whether to name a method remove or delete, a quick look at the index of this book would tell you that remove was the obvious choice There are hundreds of methods whose names begin with remove and a small handful whose names begin with delete Don't go overboard in providing convenience methods Every method should pull its weight Too many methods make a class difficult to learn, use, document, test, and maintain This is doubly true for interfaces, where too many methods complicate life for implementors as well as for users For each action supported by your type, provide a fully functional method Consider providing a shorthand for an operation only when it will be used frequently When in doubt, leave it out Avoid long parameter lists As a rule, three parameters should be viewed as a practical maximum, and fewer is better Most programmers can't remember longer parameter lists If many of your methods exceed this limit, your API won't be usable without constant reference to its documentation Long sequences of identically typed parameters are especially harmful Not only won't the users of your API be able to remember the order of the parameters, but when they transpose parameters by mistake, their programs will still compile and run They just won't do what their authors intended There are two techniques for shortening overly long parameter lists One is to break the method up into multiple methods, each of which requires only a subset of the parameters If done carelessly, this can lead to too many methods, but it can also help reduce the method count by increasing orthogonality For example, consider the javautilList interface It does ot provide methods to find the first or last index of an element in a sublist, both of which would require three parameters Instead it provides the subList method, which takes two parameters and returns a view of a sublist This method can be combined with the indexOf or lastIndexOf methods, each of which has a single parameter, to yield the desired functionality Moreover, the subList method can be combined with any other method that.

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There have been some spectacular routing failures in the Internet due to midlevel ISPs inappropriately deaggregating routes they receive and suddenly adding thousands of routes to the Internet routing table The routing architect of an AS can form reasonable expectations of the number of prefixes that an AS expects to receive from another AS These expectations can come from a routing registry or from administrative agreements between the peers For a typical customer of an ISP, the maximum number of expected refixes is probably. Bar Code Encoder In .NET Using Barcode encoder for Visual .Related: .NET Winforms Barcode Generation , Java Barcode Generator , Barcode Generating Crystal .NET Winforms

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To test the new custom tag, modify index.cfm so hat the call to <cf_TodaysDate> looks as follows:. barcode for visual c# using barcode writer for . <p><cf_TodaysDate Format= American ></p>. Make qr bidimensional .Related: Generate Intelligent Mail .NET

will be silently ignored by subclasses This is one more case where an implementation detail becomes part of a class's API to permit inheritance By now, it should be apparent that designing a class for inheritance places substantial limitations on the class This is not a decision to be undertaken lightly There are some situations where it is clearly the right thing to do, such as abstract classes, including skeletal implementations of interfaces (Item 16) There are other situations where it is clearly the wrong thing to do, such as immutable classes (Item 13) But what about ordinary concrete classes Traditionally, they are neither final nor designed and documented for subclassing, but this state of affairs is dangerous Each time a change is made in such a class, there is a chance that client classes that extend the class will break This is not just a theoretical problem It is not uncommon to receive subclassing-related bug reports after modifying the internals of a nonfinal concrete class that was not designed and documented for inheritance The best solution to this problem is to prohibit subclassing in classes that are not designed and documented to be safely subclassed There are two ways to prohibit subclassing The easier of the two is to declare the class final The alternative is to make all the onstructors private or package-private and to add public static factories in place of the constructors This alternative, which provides the flexibility to use subclasses internally, is discussed in Item 13 Either approach is acceptable This advice may be somewhat controversial, as many programmers have grown accustomed to subclassing ordinary concrete classes to add facilities such as instrumentation, notification, and synchronization or to limit functionality If a class implements some interface that captures its essence, such as Set, List, or Map, then you should feel no compunction about prohibiting subclassing The wrapper class pattern, described in Item 14, provides a superior alternative to inheritance for altering the functionality If a concrete class does not implement a standard interface, then you may inconvenience some programmers by prohibiting inheritance If you feel that you must allow inheritance from such a class, one reasonable approach is to ensure that the class never invokes any of its overridable methods and to document this fact In other words, eliminate the class's self-use of overridable methods entirely In doing so, you'll create a class that is reasonably safe to subclass Overriding a method will never affect the behavior of any other method You can eliminate a class's self-use of overridable methods mechanically, without changing its behavior Move the body of each overridable method to a private helper method and have each overridable method invoke its private helper method Then replace each self-use of an overridable method with a direct invocation of the overridable method's private helper method.

Table 911 Per-Interface BGP Configuration, Design and Dig Office 1, Router 2 AS NUMBER 64001 ROUTER AME DD-ARL-2 BGP ROUTER ID 19216812. FOR THIS INTERFACE ACCEPTANCE POLICY FOR THIS INTERFACE. . Generation In Visual C# Using Barcode encoder for .NET .Related: Barcode Generating VB.NET , Barcode Generation SSRS how to, Generate Barcode C#

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This idiom is harmless and may result in slightly improved performance if the compile-time type of the parameter matches the parameter of the more specific overloading That said, it probably isn't worth doing as a matter of course (Item 37) While the Java platform libraries largely adhere to the advice in this item, there are a number of places where it is violated For example, the String class exports two overloaded static factory methods, valueOf(char[]) and valueOf(Object), that do completely different things when passed the same object reference There is no real justification for this, and it should be regarded as an anomaly with the potential for real confusion To summarize, just because you can overload methods doesn't mean you should You should generally refrain from overloading methods with multiple signatures that have the same number of parameters In some cases, especially where constructors are involved, it may be impossible to follow this advice In that case, you should at least avoid situations where the same set of parameters can be passed to different overloadings by the addition of casts If such a situation cannot be avoided, for example because you are retrofitting an existing class to imple ment a new interface, you should nsure that all overloadings behave identically when passed the same parameters If you fail to do this, programmers will not be able to make effective use of the overloaded method or constructor, and they won't understand why it doesn't work. Drawing Bar Code In Java Using Barcode printer for .Related: 

A very good example is the conditional tag is_home(), which hecks if the page you re on is the homepage. Use it to output a greeting, since that is the polite thing to do: 29. the polite thing to do: 29. Make USS Code . Using Barcode maker for Java Control to generate, create ode 128C image in Java applications.Related: 

IP\Datagrams Sent/sec IP\Datagrams Received Delivered/sec IP\Datagrams/sec LogicalDisk(C:)\Avg Disk Bytes/Write LogicalDisk(C:)\Avg Disk Queue Length LogicalDisk(C:)\Avg Disk Transfer/sec LogicalDisk( Total)\Disk Reads/sec Memory\Committed Bytes Memory\Demand Zero Faults/sec Memory\Pages Input/sec Memory\Page Faults/sec Memory\Pool Paged Allocs Memory\Pool Paged Bytes Memory\Write Copies/sec Network Interface\Packets/sec Network Interface\Bytes Received/sec Network Interface\Packets Received/sec hysicalDisk(0 C:)\Disk Read Bytes/sec Process( Total)\% User Time Process( Total)\IO Read Operations/sec Process( Total)\IO Data Operations/sec Process( Total)\IO Write Bytes/sec Process( Total)\Page Faults/sec.

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