Java - Change background color with button?

I wish to change the color of my background with two buttons. Its not working for some reason :\

import java.awt.*;

import java.applet.*;

import javax.swing.*;

import java.awt.event.*;

public class RandomLoopGraphics extends JApplet

{

private JButton b1 = new JButton("Green"), b2 = new JButton("Blue");

private JTextField txt = new JTextField(10);

private ButtonListener bl = new ButtonListener();

public void init()

{

b1.addActionListener(bl);

b2.addActionListener(bl);

Container cp = getContentPane();

cp.setLayout(new FlowLayout());

cp.add(b1);

cp.add(b2);

cp.add(txt);

/*

//Background

//Declares RGB colors

int red, green, blue;

red = 155;

green = 70;

blue = 174;

//Now it initializes the color for the background

Color background = new Color(red, green, blue);

setBackground(background);

*/

}

public void paint(Graphics g)

{

//FONT

Font NEWFONT = new Font("Comic Sans MS", Font.BOLD, 25);//Declaring Font type and specifics

g.setFont(NEWFONT);//SETS FONT

//CIRCLE

int start = 37;//INITIALIZING START POSITION

for (int i=1; i<=10; i++)

{

g.setColor(Color.orange);//SET ORANGE COLOR

g.drawString("CIRLCE", 70, 90);//Draws the text and places it

g.drawOval(start + 25*i, 10, 50, 50);//DRAWS A CIRCLE

}

//LINE

g.setColor(Color.green);//SET GREEN COLOR

g.drawLine(0, 105, 400, 105); //DRAWS A LINE

//RECTANGLE

int rectstart = 55;//INITIALIZING START POSITION

for (int r=1; r<=23; r++)

{

g.setColor(Color.red); //SETS RED COLOR

g.drawString("RECTANGLE", 65, 200);//Draws the text and places it

g.drawRect (rectstart + 10*r, 125, 50, 50);//DRAWS A RECTANGLE

}

}

class ButtonListener implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

Object source = e.getSource();

Color color = getBackground();

if(source == b1){

setBackground(Color.green);

}

else if(e.getSource() == b2){

color = Color.blue;

}

//repaint();

String name = ((JButton) e.getSource()).getText();

txt.setText("asd" + name);

}

}

public static void main(String[] args)

{

run(new RandomLoopGraphics(), 200, 75);

}

public static void run(JApplet applet, int width, int height)

{

JFrame frame = new JFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().add(applet);

frame.setSize(width, height);

applet.init();

applet.start();

frame.setVisible(true);

}

}