You are meant to just place the JAR file somewhere the Java runtime can find it, and then refer to it in the code you write as you do the exercises in this book. Having said all that, you only get the error if you try to run the JAR like an executable. Once that is done the JAR file should run from the Finder or the Terminal successfully. This command updates the MANIFEST.MF file within the JAR. Get JFLAP INFORMATION about JFLAP: Get JFLAP Software Please fill out this form and you can have the most recent version of JFLAP to use for free. First of all download the JAR file from the Princeton website, then run the following command (assuming the JAR file is in your Downloads folder): jar ufe ~/Downloads/algs4.jar TestAlgs4 You can add this parameter using the Terminal. The Main-Class parameter tells the Java runtime which class is the Entry Point, i.e. Kumar, An optimal cluster formation based energy efficient dynamic scheduling hybrid MAC protocol for heavy traffic load in wireless sensor networks, Comput. This error means that the JAR file is missing the "Main-Class" parameter in its MANIFEST.MF file. However if you try to run the JAR file from the Terminal you get this error: no main manifest attribute, in. Even though the error message says to check the Console I couldn't find anything useful there.
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