visual basic barcode program Main class name, suncertify.db.ExamProject You have a class in Java

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Main class name, suncertify.db.ExamProject You have a class
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named ExamProject, in the suncertify.db package, and it holds the main() method for your application.
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Working directory, /project
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This is the directory one level above your
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package structure.
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Manifest file name, Manifest.MF This is not the real manifest file but
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rather your text file that holds the text you want to merge into the real manifest file that the jar tool will create.
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Manifest file contents
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The manifest file you ll write (as an ASCII text file) contains just a single line: Main-Class: suncertify.db.ExamProject
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Be certain to insert a carriage return at the end of that single line! If there is not a newline below the main line, the manifest file will not work correctly. And be certain to include the fully-qualified name of the main class (suncertify.db.ExamProject as opposed to just ExamProject).
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Preparing the Final Submission
Creating the JAR We ve got our application classes in their appropriate directory structure (matching the package structure). We ve got our manifest file, Manifest.MF. We re in a working directory that is one level above the package, so if you listed the contents of the current directory it would include a directory named suncertify (the first directory in the package hierarchy). So let s run the jar tool:
jar -cvmf Manifest.MF runme.jar suncertify/db
This creates a JAR file, named runme.jar, in your current directory. It includes all files that are in the suncertify/db directory (the package) and it also includes the directories themselves (suncertify and db). Plus, it takes the manifest file (Manifest.MF), reads its contents, and puts them into the real manifest file named MANIFEST.MF, that it puts in a directory named META-INF. At the command-line, you ll see the following when you run the jar command as follows:
jar -cvmf Manifest.MF runme.jar suncertify/db added manifest adding: suncertify/db/(in = 0) (out= 0)(stored 0%) adding: suncertify/db/ExamProject.class(in = 617) (out= 379)(deflated 38%)
Of course in your real project, you ll have more than one class. Using the preceding jar command, you ll see the manifest being added, the directory structure being added (in this case, suncertify/db), and all files in the db directory (in this case, just the ExamProject.class). More Fun with jar Tool What does that -cvmf mean What else can you do with jar tool The main purpose of the jar tool is to create archive files based on the ZIP format. It s a handy way to deliver an application, especially when it contains, for example, 4,234 classes. You could deliver all 4,243 to your end-users, but just one file is a little simpler. JAR files are also handy when you re shipping something over a network, where one fat file will ship faster than a ton of individual ones. You can do all the things you d expect to do with an archive format: make one, extract files from one, and look inside one (to display, but not extract, the contents). Table 17-1 lists examples of the basic jar tool commands. Assume that the JAR file name will be MyJar.jar and the class file we ll put in the JAR is MyClass.class.
17: Final Submission and Essay
TABLE 17-1
Basic jar Tool Commands
To create a JAR To extract the contents of a JAR To view the contents of a JAR To create a JAR with your own manifest To create a JAR that contains all files within a directory
jar -cf
MyJar.jar MyClass.class
jar -xf MyJar.jar jar -tf MyJar.jar jar -cmf myManifest.mf MyJar.jar MyClass.class jar -cf MyJar.jar suncertify/db
The key jar tool switches are described here:
c v t f m Create a new JAR file Verbose print out messages while JARring List the contents of a file (in other words, display a table) Stands for archive file name Manifest you are specifying your own text file whose contents should be put into the real manifest file.
Running the Executable JAR
Now that you ve made your JAR file and it s got your complete package structure with your main class in its appropriate directory (matching the package hierarchy) and you ve got a manifest inside that says which of your classes in the JAR has the main() method, it s a snap to run it from the command-line:
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