How to create a selectMode()

I created a method called selectMode(); and I want that method to be able to select a different mode while running. For example I have to different displays 开发者_StackOverflow中文版but only one display will show and if I want to access the other display I want to be able to select it.

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You could just add an argument to it:

selectMode( mode );

And either always require that mode be supplied, or create a second overload of selectMode with the argument.