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JColorChooser demo

import java.awt.Color; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JButton; import javax.swing.JColorChooser; import javax.swing.JFrame; public class ColorChooserDemo extends JFrame {   public ColorChooserDemo() {     super();     createUI();     setVisible(true);   }   protected void createUI() {     setSize(400, 400);     getContentPane().setLayout(new GridBagLayout());     JButton colorButton = new JButton("Choose a color...");     getContentPane().add(colorButton);     colorButton.addActionListener(new ActionListener() {       public void actionPerformed(ActionEvent ae) {         Color c = JColorChooser.showDialog(ColorChooserDemo.this,             "Choose a color...", getBackground());         if (c != null)           getContentPane().setBackground(c);       }     });     addWindowListener(new WindowAdapter() {       public void windowClosing(WindowEvent we) {         System.exit(0);       }     });   }   public static void main(String[] args) {     new ColorChooserDemo();   }    }