public class lienzo extends JPanel implements MouseListener,MouseMotionListener{


private pelota circulo;
private int x1=0,y1=0;

public lienzo(){
this.setLayout(null);
this.setBackground(Color.black);
repaint();

circulo=new pelota();
circulo.setBounds(120,100,60,60);
add(circulo);
addMouseListener(this);
addMouseMotionListener(this);

}

public void paint(Graphics g){
super.paint(g);
g.setColor(Color.white);
g.fillOval(10,10,270,270);

}
public void mouseEntered(MouseEvent e){
}

public void mouseExited(MouseEvent e){
}

public void mousePressed(MouseEvent e){
}

public void mouseMoved(MouseEvent e){
}

public void mouseDragged(MouseEvent e){
x1=e.getX();
y1=e.getY();

if(x1>20 && x1 <200 && y1>20 && y1<200){
circulo.setLocation(x1,y1);

}
}
public void mouseReleased(MouseEvent e){
}

public void mouseClicked(MouseEvent e){
}

}



public class pelota extends Canvas{

pelota(){

repaint();

this.setBackground(Color.white);
setVisible(true);
}

public void paint(Graphics g){
super.paint(g);
g.setColor(Color.ORANGE);
g.fillOval(0,0,60,60);
g.setColor(Color.black);
g.fillOval(25,0,12,60);
}



}