import java.awt.*;
public class WindowsCenter {
    /** Définir la position d'affichage d'une fenêtre de type Frame, JFrame, Dialog, etc. */
    public static void centre(Window w) {
        Dimension windowsSize = w.getSize( ), 
        screenSize = Toolkit.getDefaultToolkit( ).getScreenSize( );
        int x = (screenSize.width - windowsSize.width) / 2;
        int y = (screenSize.height- windowsSize.height)/ 2;
        w.setLocation(x, y);
    }
    public static void center(Window w) {
        WindowsCenter.centre(w);
    }
}
    