Question

I have two classes, one AnalogClock class and one MainInterface class.

I’ve created a timeChanged method in the AnalogClock class and it gets called whenever the time has changed. My AnalogClock is basically a JPanel with a drawing. In MainInterface I setup a JFrame and add an Object of my AnalogClock.

Is it possible to change the Title of my Window whenever ‘timeChanged’ is called? I tried to use getParent() or getRootParent() but they don’t recognise setTitle().

Answer 1

Use getWindowAncestor method from SwingUtilities.

//This gives you the first Window Object that contains the panel component
Window window = SwingUtilities.getWindowAncestor(panel);

//Cast it to JFrame
JFrame frame = (JFrame) window;

 //Now, change the title
frame.setTitle("New Title");