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package MyPackageMyDaughterMyGranddaughter
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A directory structure is created to replicate the package hierarchy Each package in the hierarchy gets its own directory/subdirectory For example, the MyPackage hierarchy is stored in the following directory structure:
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C:\MyPackage\MyDaugher\MyGraddaughter
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The names of these directories must exactly match the names of these packages
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You access classes stored in a package by using an import statement at the top of your source code The import statement must contain the name of the package and the class(es) you want to use in your source code Let s say that you want to use the Student class that is contained in the MyPackage package You d write the following import statement at the top of your source code:
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import MyPackageStudent
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The import statement tells Java where to reference the class Once a class is imported into your source code, you can use the name of the class to reference it You don t need to reference the package name In real-world applications, you ll probably want to import all the classes of a package rather than a few classes You do this by using an asterisk rather than a class name in the import statement Using the asterisk may increase compile time, but it will have no effect on run-time performance Here s how you import all the classes in the MyPackage package:
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import MyPackage*
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You can reference a class within a package without having to import the package by using the fully qualified class name in a statement within your source code A fully qualified class name consists of the package name, a dot, and the class name Let s say that the Student class in MyPackage has a method member called display(), and we want to call that method within our source code Here s how this is done:
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MyPackageStudentdisplay();
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Notice that the fully qualified class name is used rather than an import statement Using the import statement or using the fully qualified class name produces the same results You reference a package hierarchy in the import statement the same way you reference a single package, except you use all the package names in the hierarchy, separating each one with a dot
CLASSPATH
Packages can cause you problems when compiling and running a program because of the way Java locates packages Java uses the CLASSPATH environment variable to locate packages If the directory containing a package is not referenced in the CLASSPATH, the package won t be found by Java An environment variable is a memory location allocated by an operating system whose contents are available to programs running within the operating system Some environment variables are defined automatically by the operating system Other environment variables are defined by a program when the program is installed And still other environment variables are defined by a programmer The CLASSPATH environment variable is defined when you install Java on your computer Previously in this chapter, you learned that the default package is used whenever you don t specify a package in your source code The default package is stored in the default current working directory, and the default current working directory is on the CLASSPATH This is why you can compile and run programs without explicitly specifying a package As you ll recall, each package is stored in its own directory That directory must be included on the CLASSPATH in order for your source code to use the package; otherwise, you won t be able to compile your source code because the compiler won t know where to look for the package The CLASSPATH sets the top of the class hierarchy, so you must include the top directory of your package hierarchy in the CLASSPATH You do so by editing the CLASSPATH In Windows, you create or edit an environment variable by following these steps: 1 Select the Control Panel 2 Select Systems 3 Select the Advanced tab 4 Select Environment Variables 5 Select New to insert the CLASSPATH environment variable, if it doesn t exist You do this by entering a variable name (CLASSPATH) and a value, which is the path to the package
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