Tell whether or not the window is open.
This function returns whether or not the window exists. Note that a hidden window (setVisible(false)) is open (therefore this function would return true).
true if the window is open, false if it has been closed
See Implementation
Tell whether or not the window is open.
This function returns whether or not the window exists. Note that a hidden window (setVisible(false)) is open (therefore this function would return true).