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copied!<p>@Steffen Kuehn please check out the below code which presents the 'possible' problem you are experiencing. i.e. you are not revalidating and repainting the panel which was changed.</p> <p>Please notice when you click the panel using left mouse button there is no repainting/revalidation, and at first it seems nothing is happening. Try to resize the frame. It calls the operations and you will see that the elements 5 & 6 are in fact visible. Thus if you want the changes to be instant use the right click which does visibility change and validation.</p> <pre><code> import java.awt.Color; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingUtilities; public class FlowComponentsTest { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { final JPanel p = new JPanel(); for(int i = 1; i <= 20; i++) { JComponent c = new JTextField("I am element no. " + i); //so any textfield will not steal the focus from the panel p c.setFocusable(false); p.add(c); if(i == 5 || i == 6) { c.setForeground(Color.GREEN); c.setVisible(false); } } JFrame f = new JFrame(); f.addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { JComponent c5 = (JComponent) p.getComponent(4); JComponent c6 = (JComponent) p.getComponent(5); c5.setVisible(!c5.isVisible()); c6.setVisible(!c6.isVisible()); if(e.getButton() == MouseEvent.BUTTON3) { System.out.println("Right click"); p.revalidate(); p.repaint(); } } }); f.setContentPane(p); f.setSize(300, 330); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); } }); } } </code></pre>

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