How to run java application with built-in command line arguments?

I am making a Java application that is stored in a .jar file and can be launched by opening the jar file either from the command line or from clicking the icon.

For the Mac version of the app, I would like the menu bars to appear at the top of screen in the Mac style instead of in the window (the Windows style). I know this can be done with the command li开发者_如何学运维ne:

java -jar App.jar -Dcom.apple.macos.useScreenMenuBar=true

But this won't work if the user doesn't know how to do this. Is there a way to make this command line argument "built in" to the jar file?

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You can do this by setting the system property in your code in the main method or some other method which is called at the very beginning of the application:

System.setProperty("com.apple.macos.useScreenMenuBar", "true")

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Is is necessary to do it with the command line? You could check it in code with System.getProperty("os.name").

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Inside my main method, I would make use of the built in os.name parameter and default your command line argument as appropriate if it was not otherwise set.

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I would suggest that you bundle the .jar into a standard mac .app file. Then, in Info.plist, you can specify all sorts of runtime items, including "Arguments" and "Properties". Take a look at http://developer.apple.com/library/mac/#documentation/Java/Reference/Java_InfoplistRef/Articles/JavaDictionaryInfo.plistKeys.html