Changing colors in LAF

Question

I'd like to know, there is any possibility to change for example JPanel background color in actually used LookAndFeel. I imagin this methode like that:
actualLookAndFell.setSomething("JPanel.background", new Color(0,0,0))

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.ColorUIResource;
public class UIDefaultsTest
    public static void main(String[] args)
        JTextArea textArea = new JTextArea();
        textArea.setMargin(new Insets(5,5,5,5));
        UIDefaults defaults = UIManager.getLookAndFeelDefaults();
        Iterator it = defaults.keySet().iterator();
        while(it.hasNext())
            String key = (String)it.next();
            if(key.toLowerCase().indexOf("panel") != -1)
                textArea.append(key + "  :  " + defaults.get(key) + "\n");
        ColorUIResource resource = new ColorUIResource(Color.pink);
        UIManager.put("Panel.background", resource);
        JPanel panel = new JPanel();
        panel.setPreferredSize(new Dimension(panel.getPreferredSize().width, 30));
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setJMenuBar(getMenuBar(f));
        f.getContentPane().add(new JScrollPane(textArea));
        f.getContentPane().add(panel, "South");
        f.setSize(300,300);
        f.setLocation(200,200);
        f.setVisible(true);
    private static void changeLAF(String className, Component c)
        try
            UIManager.setLookAndFeel(className);
            SwingUtilities.updateComponentTreeUI(c);
        catch(ClassNotFoundException cnfe)
            System.out.println("class not found: " + cnfe.getMessage());
        catch(InstantiationException ie)
            System.out.println("instantiation: " + ie.getMessage());
        catch(IllegalAccessException iae)
            System.out.println("illegal access: " + iae.getMessage());
        catch(UnsupportedLookAndFeelException ulafe)
            System.out.println("unsupported laf: " + ulafe.getMessage());
    private static JMenuBar getMenuBar(final Component c)
        JMenu view = new JMenu("view");
        ActionListener l = new ActionListener()
            public void actionPerformed(ActionEvent e)
                JMenuItem item = (JMenuItem)e.getSource();
                changeLAF(item.getActionCommand(), c);
        UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels();
        for(int j = 0; j < info.length; j++)
            JMenuItem item = new JMenuItem(info[j].getName());
            item.setActionCommand(info[j].getClassName());
            item.addActionListener(l);
            view.add(item);
        JMenuBar menuBar = new JMenuBar();
        menuBar.add(view);
        return menuBar;
}