Java find what JFrame belongs to a JPanel

Question

I have a multiple JPanels which are put in a dialogue and after many hours, I am still unable to find the frame in which the JPanels are stored in. I was wondering if there is a method which would return the JFrame (end goal is to call setDefaultCloseOperation() on the JFrame). I was thinking getParent() would do this however I am still unable to call setDefaultCloseOperation no matter how many layers of parents I go through.

Answer 1

There is a utility method for it: SwingUtilities.getWindowAncestor()

If you add your JPanel to a JFrame, it will be obviously a JFrame instance:

JFrame f = (JFrame) SwingUtilities.getWindowAncestor(panel);

Note: getWindowAncestor() and windowForComponent() provide the same functionality.

Answer 2

Window window = SwingUtilities.windowForComponent(...);