Focus, boton y contador

package ejercicios;

import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;

public class Ejerciciofocus {
Frame f=new Frame();
Button contar;
private int cont=0;
public Ejerciciofocus()
{
f.setTitle("hola Mund90");
f.setSize(300,200);
f.setBackground(Color.white);
f.setLayout(new FlowLayout());
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
f.addWindowFocusListener(new WindowFocusListener(){

@Override
public void windowGainedFocus(WindowEvent arg0) {
f.setBackground(Color.black);

}

@Override
public void windowLostFocus(WindowEvent arg0) {
f.setBackground(Color.red);

}
});

contar=new Button("contar");
contar.setSize(50,25);
contar.addMouseListener(new MouseListener(){

@Override
public void mouseClicked(MouseEvent e) {

System.out.println("Ha pulsado el boton "+cont+" veces");
cont++;

}

@Override
public void mouseEntered(MouseEvent e) {
// cont++;
// System.out.println("HA entrado al boton "+cont+"veces");

}

@Override
public void mouseExited(MouseEvent e) {
// cont++;
//System.out.println("Ha salido del boton "+cont+"veces");

}

@Override
public void mousePressed(MouseEvent e) {
cont++;
System.out.println("Ha presionado en el boton "+cont+"veces");

}

@Override
public void mouseReleased(MouseEvent e) {
cont++;
//System.out.println("Ha releaseado "+cont+" veces");

}

});
contar.addMouseMotionListener(new MouseMotionListener(){

@Override
public void mouseDragged(MouseEvent arg0) {


}

@Override
public void mouseMoved(MouseEvent arg0) {
System.out.println("se esta moviendo el mouse");
cont++;
System.out.println("Se ha movido "+cont+" veces dentro del boton ");
}
});
f.add(contar);
f.setVisible(true);
}
public static void main(String[] args) {
Ejerciciofocus ef=new Ejerciciofocus();

}

}