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I think I see what you mean, and I believe it has to do with specifying an alpha value for the background color of the JButton. Every time you mouse over it, the alpha value gets a little darker....

Can you provide an SSCCE that demonstrates this problem? JButtons don't do that for me by default.

I recommend you check out the API and the basic tutorials, which incidentally are the first and second respective results for googling "java file".

Or you could just create a new File instance and use the getName() function. Probably better as it's more platform independent than using a hard-coded character that might change for different...

Escape the escape character.

System.out.println("\\");

What's your end goal with this?