21. JColorChooser - ShowDialogue - Pick a color

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Peach extends JFrame{

    // Variables
    private JButton b;
    private Color color = Color.WHITE;
    private JPanel panel;

    // Constructor
    public Peach(){
        super("JFrame's title");
        panel = new JPanel();
        panel.setBackground(color);
        b = new JButton("Choose a color");
        b.addActionListener(
                new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        color = JColorChooser.showDialog(null, "Pick your color", color);
                        if(color == null)
                            color = Color.WHITE;
                        panel.setBackground(color);
                    }
                }
        );

        add(panel, BorderLayout.CENTER);
        add(b, BorderLayout.SOUTH);
        setSize(425, 150);
        setVisible(true);
    }

    // Main Function
    public static void main(String[] args){
        Peach p = new Peach();
        p.setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
}