Background Changing in JPanels

Question

Hi ! I really need fast help on this //Its my first post BTW.
Anyway, i have a window and i want to enable the user to switch its background at will.
The default background is "Black". The problem is, after choosing the new background, the window stays black and only changes after i resize the window, after that, it doesn't change anymore (even resizing). I wont paste the whole code, just the part that matters!
//previous code...
//this is programmed on my constructor
JMenu back  = new JMenu("Background         "); viewMenu.add(back);        viewMenu.addSeparator();
back1 = new JMenuItem("Background 1"); back1.addActionListener(g); back.add(back1);
back2 = new JMenuItem("Background 2"); back2.addActionListener(g); back.add(back2);
back3 = new JMenuItem("Background 3"); back3.addActionListener(g); back.add(back3);
back4 = new JMenuItem("Background 4"); back4.addActionListener(g); back.add(back4);
back5 = new JMenuItem("Background 5"); back5.addActionListener(g); back.add(back5);
//more code....
private class EventManager implements ActionListener
{ public void actionPerformed(ActionEvent e)
JLabel gish = new JLabel("");
if(e.getSource() == back1)
{ gish.setIcon(new ImageIcon("1.jpg"));
center.add(gish); center.repaint();}  //center is a JPanel, its programmed like this:
//                            center = new JPanel(); center.setBackground(Color.BLACK);
if(e.getSource() == back2)  //& then added on my frame like this:
{ gish.setIcon(new ImageIcon("2.jpg"));  //frame.add(center, BorderLayout.CENTER);
center.add(gish); center.repaint();}
if(e.getSource() == back3)
{ gish.setIcon(new ImageIcon("3.jpg"));
center.add(gish); center.repaint();}
if(e.getSource() == back4)
{ gish.setIcon(new ImageIcon("4.jpg"));
center.add(gish); center.repaint();}
if(e.getSource() == back5)
{ gish.setIcon(new ImageIcon("5.jpg"));
center.add(gish); center.repaint();}
}Tkx in advance!!!

Answer 1

mpmarrone wrote:
Where's the part where you set the background? To quote the OP "I wont paste the whole code, just the part that matters!"
1) Nobody wants your 'whole code'. Especially if it is as poorly indented and formatted as what you posted. What is generally recommended is for you to prepare and post an SSCCE *(<- link)* that demonstrates the problem.
2) If you don't know the solution, how can you possibly know what 'matters' and what does not?
You might get the effect you are after by calling repaint().
If not, I suggest you prepare an SSCCE that has only one code statement per line, and uses one of the two standard forms of bracketing and indenting. Then post that SSCCE to the forum.