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At its core, the term generics means parameterized types Parameterized types are important because they enable you to create classes, interfaces, and methods in which the type of data upon which they operate is specified as a parameter Using generics, it is possible to create a single class, for example, that automatically works with different types of data A class, interface, or method that operates on a parameterized type is called generic, as in generic class or generic method It is important to understand that Java has always given you the ability to create generalized classes, interfaces, and methods by operating through references of type Object Because Object is the superclass of all other classes, an Object reference can refer to any type object Thus, in pre-generics code, generalized classes, interfaces, and methods used Object references to operate on various types of objects The problem was that they could not do so with type safety Generics add the type safety that was lacking They also streamline the process, because it is no longer necessary to explicitly employ casts to translate between Object and the type of data that is actually being operated upon With generics, all casts are automatic and implicit Thus, generics expand your ability to reuse code and let you do so safely and easily

Most of the popular automated system-monitoring solutions specialize in monitoring network-based services and daemons However, most of the popular ones also have extensive local resource-monitoring capabilities The automated tools can monitor things like disk usage, CPU usage, process counts, changes in file system objects, etc A couple of these tools include Nagios and Tripwire

are not the same There are some fundamental differences between the two approaches to generic types If you have a background in C++, it is important not to jump to conclusions about how generics work in Java

Let s begin with a simple example of a generic class The following program defines two classes The first is the generic class Gen, and the second is GenDemo, which uses Gen

As part of managing your system s security, you should be subscribed to key security mailing lists, like BugTraq (wwwsecurityfocuscom/archive/1) BugTraq is a moderated mailing list that generates only a small handful of e-mails a day, most of which may not pertain to the software you are running However, this is where critical issues are likely to show up first The last several significant worms that attacked Internet hosts were dealt with in real time on these mailing lists In addition to BugTraq, any security lists for software that you are responsible for are musts Also look for announcement lists for the software you use All of the major Linux distributions also maintain announcement lists for security issues that pertain to their specific distributions Major software vendors also maintain their own lists Oracle, for example, keeps their information online via their MetaLink web portal and corresponding e-mail lists While this may seem like a lot of e-mail, consider that most of the lists that are announcement-based are extremely low-volume In general, you should not find yourself needing to deal with significantly more e-mail than you already do

// A simple generic class // Here, T is a type parameter that // will be replaced by a real type // when an object of type Gen is created class Gen<T> { T ob; // declare an object of type T // Pass the constructor a reference to // an object of type T Gen(T o) { ob = o; } // Return ob T getob() { return ob; } // Show type of T void showType() { Systemoutprintln("Type of T is " + obgetClass()getName()); } }

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