I REALLY NEED to update my graphics - please

Question

Please, someone help me.
The blue shape does not update when you scroll
the panel.
It happens because i am using variable to set the shape
coordinates.
i need to make it possible (update the shapes using variables).
understood ???
thanks.
here's the simplified code to execute:
import java.awt.*;
import java.awt.event.*;
public class SamS extends Frame
public SamS()
addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent ev)
dispose();
System.exit(0);
ScrollPane sp = new ScrollPane();
Board pan = new Board();
sp.add(pan);
add(sp);
setSize(700,500);
setVisible(true);
public class Board extends Panel
int x=20;
int y=20;
public Board()
super();
setLayout(null);
setSize(2400,2400);
setBackground(Color.white);
public void paint(Graphics g)
g.setColor(Color.black);
g.fillRect(10,10,100,100);
g.setColor(Color.red);
g.fillRect(410,410,100,200);
g.setColor(Color.orange);
g.fillRect(490,210,300,100);
g.setColor(Color.blue);
g.fillRect(x+100,y+100,150,150);
x=x+100;
y=y+100;
public void update(Graphics g)
paint(g);
public static void main(String args[])
new SamS();

Answer 1

Try this:
sp.setViewportView(pan);
<tg>