10. JList - Change background color

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

public class Gui extends JFrame{

    // Variables
    private JList list;
    private static String[] colornames = {"black", "blue", "red", "white"};
    private static Color[] colors = {Color.BLACK, Color.BLUE, Color.RED, Color.WHITE};

    // Constructor
    public Gui(){

        super("JFrame's title");
        setLayout(new FlowLayout());
        list = new JList(colornames);
        list.setVisibleRowCount(4);
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);    // Select only 1 at a time
        add(new JScrollPane(list));

        list.addListSelectionListener(
                new ListSelectionListener() {
                    @Override
                    public void valueChanged(ListSelectionEvent event) {
                        // Access content pane ---> Set background
                        getContentPane().setBackground(colors[list.getSelectedIndex()]);
                    }
                }
        );

    }

    // Main Function
    public static void main(String[] args){
        Gui gui = new Gui();
        gui.setDefaultCloseOperation(EXIT_ON_CLOSE);
        gui.setSize(600, 600);
        gui.setVisible(true);
    }

}