Mouse- esercizio in java fatto in classe

Al click del mouse si memorizzino le cordinate per tracciare una retta fino ad un altro punto fatto con un altrettanto click del mouse


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Mouse extends JPanel implements MouseListener {
private int x1;
private int y1;
private int x2;
private int y2;
private int conta =0;
public Mouse(){
addMouseListener(this);
}
public void mouseClicked(MouseEvent e){
int x= e.getX();
int y=e.getY();
conta++;
if(conta==1){
x1=x;
y1=y;
}
if(conta==2){
x2=x;
y2=y;
conta=0;
repaint();
}
}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
public void paintComponent(Graphics g){
g.drawLine(x1, y1, x2, y2);
}
}


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TestaMouse {
public static void main(String[]args){
JFrame f1 = new JFrame("traccia retta");
f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f1.setSize(400,400);
Mouse m1 = new Mouse();
f1.add(m1,BorderLayout.CENTER);
f1.setVisible(true);
}
}