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Notice that the code doesn t declare class SquareWidget. Instead, you use the class defined in SuperLib. When you compile the MyWidgets program, however, the compiler must be aware that your code uses assembly SuperLib so it can get the information about class SquareWidget. To do this, you need to give the compiler a reference to the assembly, by giving its name and location. In Visual Studio, you can add references to a project in the following way: Select the Solution Explorer and find the References folder underneath the project name. The References folder contains a list of the assemblies used by the project. Right-click the References folder and select Add Reference. There are five tab pages from which to choose, allowing you to find the class library in different ways. For our program, select the Browse tab, browse to the DLL file containing the SquareWidget class definition, and select it. Click the OK button, and the reference will be added to the project.

Inheritance and polymorphism are adaptations. In constructing an application, each instance of adaptation depletes adaptability. Inheritance should be used only when a function must have changes inserted or when an object must be implicitly replaced. Multiplication is much better managed by combining one new class with the old ones.

No single printed book can cover all the new features of Mustang. While I ll try to neatly break up the new features into the following nine chapters, not everything fits in so nicely. For starters, Table 1-1 identifies the new packages in Java SE 6.

After you ve added the reference, you can compile MyWidgets. The full compilation process is illustrated in Figure 10-2.

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There s a class library that I ve been using in almost every example in the book so far. It is the one that contains the Console class. The Console class is defined in an assembly called mscorlib in a file called mscorlib.dll. You won t find this assembly listed in the References folder, however. Assembly mscorlib contains the definitions of the C# types, and the basic types for most .NET languages. It must always be referenced when compiling a C# program, so Visual Studio doesn t show it in the References folder. When you take into account mscorlib, the compilation process for MyWidgets looks more like the representation shown in Figure 10-3. After this, I ll assume the use of the mscorlib assembly without representing it again.

java.text.spi java.util.spi javax.activation javax.annotation javax.jws javax.jws.soap javax.lang.model.* javax.script javax.tools javax.xml.bind.* javax.xml.crypto.* javax.xml.soap javax.xml.stream.* javax.xml.ws.*

Philosophy must be practically applicable to be of any real value. The pure philosophy behind the origin of function-oriented software was a desire to study and, therefore, model real-world system behaviors, with an unknown end result. Real-world behaviors include adaptability, which turns out to be a great benefit for everyday business software.

Figure 10-3. Referencing class libraries Now suppose that your program has been working fine with the SquareWidget class, but you want to expand its capabilities to use a class called CircleWidget, which is defined in a different assembly called UltraLib. The MyWidgets source code now looks like the following. It creates a SquareWidget object as defined in SuperLib, and a CircleWidget object as defined in UltraLib. class WidgetsProgram { static void Main( ) { SquareWidget sq = new SquareWidget(); ... CircleWidget circle = new CirclWidget(); ... } }

The source code for class library UltraLib is shown in the following example. Notice that besides class CircleWidget, like library SuperLib, it also declares a class called SquareWidget. You can compile UltraLib to a DLL and add it to the list of references in project MyWidgets. public class SquareWidget { ... } public class CircleWidget { public double Radius = 0; public double Area { get { ... } } } Since both libraries contain a class called SquareWidget, when you attempt to compile program MyWidgets, the compiler produces an error message because it doesn t know which version of class SquareWidget to use. This name clash is illustrated in Figure 10-4.

Service provider classes for java.text package Service provider classes for java.util package Activation Framework Annotation processing support Web services support classes SOAP support classes For modeling a programming language and processing its elements and types Java Scripting Engine support framework Provides access to tools, such as the compiler JAXB-related support XML cryptography related support For creating and building SOAP messages Streaming API for XML support JAX-WS support

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