Tiny File Manager

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package lineProject;
 
 
   
public class ExperimentalClass { 
     
    private static int click = 0;
    static ArrayList<Point> pointStore = new ArrayList<Point>();
    // as much as possible, don't use the water in the tank when they're off 
    // because it can cause air locks. You'll get no water anyway if the tank is 
    // empty 
    public static void main(String[] args) throws Exception { 
        JFrame f = new JFrame("Draw a red line"); 
        f.setSize(300, 300); 
        f.setLocation(300, 300); 
        f.setResizable(false); 
   
        JPanel p = new JPanel() { 
            Point pointStart = null; 
            Point pointEnd = null; 
            { 
                addMouseListener(new MouseAdapter() { 
                    public void mousePressed(MouseEvent e) { 
                        pointStart = e.getPoint();
   
                    } 
   
                    public void mouseReleased(MouseEvent e) { 
                       if(click==0){
                           click++;
                           pointStore.add(e.getPoint());
                            
                       }
                       else{
                          pointEnd = e.getPoint();
                          pointStart=pointStore.get(0);
                          pointStore.remove(0);
                          click=0;
                           
                       }
   
                    } 
                }); 
                addMouseMotionListener(new MouseMotionAdapter() { 
                    public void mouseMoved(MouseEvent e) { 
                        pointEnd = e.getPoint(); 
                    } 
   
                    public void mouseDragged(MouseEvent e) { 
                        pointEnd = e.getPoint(); 
                        repaint(); 
                    } 
                }); 
            } 
   
            public void paint(Graphics g) { 
                super.paint(g); 
                if (pointStart != null) { 
                    g.setColor(Color.red); 
                    g.drawLine(pointStart.x, pointStart.y, pointEnd.x, 
                            pointEnd.y); 
   
                } 
            } 
        }; 
        f.add(p); 
        f.setVisible(true); 
   
    } 
}