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I am creating an desktop application that runs at background and while clicking the control button it should be visible i have made the setVisible(false) to the JFrame any idea how to do it . The application should triggered if you click the control button twice in desktop or in any application this should work.
This can’t be done in your application.
If it runs in the background, it doesn’t have the focus, so it can’t react on that event. Any other application might have the focus and being interested in consuming the Ctrl button.
Think of multiple such programs, all in concurrence for that button. Which should get informed? Think of 3 Editors, all getting the next character typed.
Your OS or DE might have a way to define a hotkey, look whether your program is running (once?), and send a message to your application. The application might then react.