How to remove all components from a JFrame in Java?

java swing jframe repaint removeall
scaevity picture scaevity · Feb 19, 2012 · Viewed 68.4k times · Source

I'm writing a program where I have a JFrame and I want to remove all components from it, then add just one component to it and repaint the frame. What I have so far is something like the code below (called in an object that implements JFrame, where StartPanel implements JPanel):

removeAll();    
startPanel = new StartPanel();
startPanel.setVisible(true);
add(startPanel);
revalidate();
repaint();

However, when I run the code it shows an empty window (not the startPanel) and when I minimize/resize the window, the window turns black. If I leave out the removeAll() and there are not elements already on the JFrame it displays the startPanel just fine. Any ideas on how to actually remove everything, and then get the new panel to still show up?

Answer

Kavka picture Kavka · Feb 19, 2012

You must call

 private JFrame frame = new JFrame();
 ...
 ...
 frame.getContentPane().removeAll();
 frame.repaint();

removeAll() has not been overridden as add() or remove() to forward to the contentPane as necessary.

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