Source Code Eclipse : Listener (Event Handling)

import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;

public class listener extends JFrame implements MouseListener {
    public listener() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 500);
        setLocation(300, 150);
        setAlwaysOnTop(true);
        setResizable(false);
        setTitle("[" + getHeight() + " : " + getWidth() + "]");
        listener.this.addMouseListener(this);
    }

    public void mouseClicked(MouseEvent e) {
        this.getContentPane().setBackground(Color.YELLOW);
    }

    public void mousePressed(MouseEvent e) {
        this.getContentPane().setBackground(Color.BLUE);
    }

    public void mouseReleased(MouseEvent e) {
        this.getContentPane().setBackground(Color.RED);

    }

    public void mouseEntered(MouseEvent e) {
        this.getContentPane().setBackground(Color.DARK_GRAY);
    }

    @Override
    public void mouseExited(MouseEvent e) {
        this.getContentPane().setBackground(Color.GREEN);

    }

    public static void main(String[] args) {
        listener list = new listener();
        list.setVisible(true);

    }

}

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