JSlider Project

import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;


public class Slider_project extends JFrame implements ChangeListener{

    private Container C;
    private JSlider rs,gs,bs;
    private JTextField rf,gf,bf;
    private JLabel rl,gl,bl;
    Slider_project(){
    C=this.getContentPane();
    C.setLayout(null);
    JLabel rl = new JLabel("RED");
    rl.setBounds(10, 40, 50, 20);
    C.add(rl);
    JSlider rs = new JSlider(0,100,0);
    rs.setBounds(70, 40, 200, 20);
    C.add(rs);
    JTextField rf = new JTextField();
    rf.setBounds(280, 35, 60, 40);
    rs.addChangeListener(this);
    C.add(rf);


    }
    public static void main(String[] args) {
        Slider_project frm = new Slider_project();
        frm.setVisible(true);
        frm.setBounds(300, 100, 500, 400);
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    @Override
    public void stateChanged(ChangeEvent e) {
        int value = rs.getValue();
        rf.setText(""+value);
    }

}