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How to start a specific main class from a jar

I have a jar file with two Java classes that have basic methods. Is there a way that I can indicate when running the jar file which class to call? I know that the manifest file can be modified to indicate the main class, but since only one class is mentioned, this does not help. I checked the links below, but these problems solve the problem:

stack overflow

manifest file execute main class from jar

It gives a NoClassDefFoundError.

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java -cp target/your_file.jar your.package.name.YourClass
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, . main() .

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Write a main class in which the main method calls the actual method depending on the passed command line argument. Add this main class to the manifest.

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