What Does The Exclamation Mark Before Class Path Do In Proguard?

I studying the Proguard now but im confused with the exclamation mark ! before the classpath in the settings, such as: -keep class !android.support.v7.view.menu.{*;}** what does th

Solution 1:

It means the same thing that ! means in many other programming languages. It negates the selection that follows. So in your example, the keep directive will apply to everything that is not in the following package/class selection.