help importing pictures into paint component of another class.

[Grid_iso]

so I have this jpanel and it works fine- compiles and runs (unfinished) and I want to split things up so I can deal with the actions etc here but have objects in other classes to keep things clean. Here is my jpanel right now.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.Color;

public class A3JPanel extends JPanel { //implements KeyListener, ActionListener
	private Timer t;

 	public A3JPanel() {
		setBackground(Color.white);
		//t= new Timer(30,this);
		//addKeyListener(this);
	}
	Color lightBrown = new Color(150,60,40);
	Color darkBrown = new Color(100,10,40);

   	public void paintComponent(Graphics g){
 	    super.paintComponent(g);
		g.setColor(Color.GREEN);
		g.fillRect(0, 0, 600, 500);
		g.setColor(Color.BLUE);
		g.fillRect(0, 400, 600, 100);
		g.setColor(darkBrown);
		g.fillRect(20, 430, 15, 100);
		g.fillRect(100, 430, 15, 100);
		g.fillRect(180, 430, 15, 100);
		g.fillRect(260, 430, 15, 100);
		g.fillRect(340, 430, 15, 100);
		g.fillRect(420, 430, 15, 100);
		g.fillRect(500, 430, 15, 100);
		g.fillRect(580, 430, 15, 100);
		g.setColor(Color.BLUE);
		g.fillRect(0, 480, 600, 30);
		g.setColor(lightBrown);
		g.fillRect(0, 425, 600, 15);
		g.setColor(Color.YELLOW);
		g.fillRect(0, 0, 600, 20);
		g.setColor(Color.GREEN);
		g.fillRect(7,3, 30, 14);
		g.fillRect(44,3, 30, 14);
		g.fillRect(81,3, 30, 14);
		g.fillRect(118,3, 30, 14);
		g.fillRect(155,3, 30, 14);
		g.fillRect(192,3, 30, 14);
		g.fillRect(229,3, 30, 14);
		g.fillRect(266,3, 30, 14);
		g.fillRect(303,3, 30, 14);
		g.fillRect(340,3, 30, 14);
		g.fillRect(377,3, 30, 14);
		g.fillRect(414,3, 30, 14);
		g.fillRect(451,3, 30, 14);
		g.fillRect(488,3, 30, 14);
		g.fillRect(525,3, 30, 14);
		g.fillRect(562,3, 30, 14);
		
	}

}

I want all of what is printed out to be put in another class, but last time I tried doing this I had some issues and it wouldn't print out, how would I go about inserting g.setColor(Color.GREEN); to g.fillRect(562,3, 30, 14); all in to its own class called something like background

[Norm]

To execute code in a method in another class, create an instance of the other class, save the reference to that class object and then use that reference to call the method.