pixelGetColor in Java to print a color

Question

//package mci;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.GeneralPath;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
 import javax.swing.*;
 import java.awt.Color;
   import java.awt.Robot;


 public class Cross extends JFrame{

private static final long serialVersionUID = 4952421515715804191L;

static private int positionPointerX = 0;    //Position X des Mauszeigers
static private int positionPointerY = 0;    //Position Y des Mauszeigers

//Initialisierung
public Cross()
{
    super("Kreuz");

    Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();

    setBounds(0, 0, 800, 600);
    setLocation((int)dim.getWidth()/2 - getWidth()/2, (int)dim.getHeight()/2 - getHeight()/2);
    setBackground(Color.white);
    setForeground(Color.black);

    addWindowListener(new WindowAdapter()
    {   
        public void windowClosing(WindowEvent e) 
        {
            System.exit(0);
        }
    });

    setVisible(true);
}

//Zeichnen
public void paint(Graphics g1D) 
{
    //try { //aufgabe d
    Graphics2D g = (Graphics2D) g1D;
    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g.clearRect(0, 0, getWidth(), getHeight());

    //Position der Maus im Bildschirm
    g.setFont(new Font("Tahoma", Font.BOLD,64));
    g.drawString(positionPointerX+" "+positionPointerY, 250, 550); 
    Graphics2D g2d = (Graphics2D) g;//start a
    GeneralPath path = new GeneralPath(GeneralPath.WIND_NON_ZERO);
    path.moveTo(100, 50);
    path.lineTo(150, 50);
    path.lineTo(150, 100);
    path.lineTo(200, 100);
    path.lineTo(200, 150);
    path.lineTo(150, 150);
    path.lineTo(150, 200);
    path.lineTo(100, 200);
    path.lineTo(100, 150);
    path.lineTo(50, 150);
    path.lineTo(50, 100);
    path.lineTo(100, 100);
    path.closePath();//end a
    GradientPaint redtowhite = new GradientPaint(100, 50, Color.red, 150, 200,
    Color.blue);  
    g2d.setPaint(redtowhite);   //B
    g2d.fill(path);
    g2d.setPaint(Color.green); // C
    g2d.setStroke(new BasicStroke(4.0f));//C
    g2d.draw(path);
   /* Robot robot = new Robot(); //Aufgabe D
    Color color = (robot.getPixelColor(positionPointerX, positionPointerY));    
    int red = color.getRed();
    int green = color.getGreen();
    int blue = color.getBlue();
    Color farbe = new Color(red,green,blue);
    g2d.setPaint(farbe); // D
    g2d.setStroke(new BasicStroke(4.0f));//D
    g2d.draw(path);
    */





}
 /* catch (AWTException e) { ((aufgabe D
        e.printStackTrace();
        }

}*/
//Hauptschleife (Update alle 1/60 Sekunden)
public static void main(String[] args)
{
    Cross window = new Cross();
    while(true)
    {
        try
        {
            Thread.sleep(1000/60);
        } 
        catch(InterruptedException ex)
        {
            Thread.currentThread().interrupt();
        }

        PointerInfo pointerInfo = MouseInfo.getPointerInfo();
        Point pointerPos = pointerInfo.getLocation();
        positionPointerX = pointerPos.x;
        positionPointerY = pointerPos.y;
        window.repaint();
    }
}

}

Hey Guys, so for some study excercises, i wanted to draw a cross, with a border that paints according to the color the mouse points to, but it keeps being green. to have my code remove the comment blocks. Somehow i cant draw the color the robot gets, or i cant get it updated, i dont know. if i close the window its actually turning red from hitting x button, but as i said... i dunno. i'd really appreciate some commentated help. kind regards