Painting from outside main class

Question

Im writing some generic code and im having trouble trying to get the called class to paint correctly. I have this code so far, and it works, but I dont like it. I pass in graphics as a parameter and it doesnt use the natural repaint method, so I was hoping someone could show me how to do this the "right way". I also want to avoid using threads, im pretty sure theyre not absolutely necessary.
Theres 2 classes, essentially its
class 1: paint a green splashscreen, user presses button> call class 2
class 2: paint a white screen and moving ball
(the while loop has been commented out so i can check the state of repaint. My normal programs automatically repaint if i minimise them, this one wont repaint properly).
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
public class Multi extends Applet implements ActionListener{
Mgame game=new Mgame();
private Button host;
    public void init() {
    setLayout(null) ;
    setButtons();
    public void paint(Graphics g) {
    g.setColor(Color.green);   
    g.fillRect(0,0,700,500); 
     public void setButtons() {
    host= new Button ("Host Game");
    host.setBounds(470,395,100,30);
    add(host);
    host.addActionListener(this);
     public void actionPerformed(ActionEvent event)
              Graphics g = getGraphics();
              game.gamerun(g);
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
class Mgame{
int ballx = 0;
Graphics g;
public void xpaint(){
    g.setColor(Color.white);   
    g.fillRect(0,0,700,500);         
    g.setColor(Color.red);   
    g.fillOval(ballx, 40, 90, 90);
public void gamerun(Graphics graphics){
    g=graphics;
    //while(true){
    ballx=ballx+1;
    if (ballx==500) {ballx=10;}
    try { Thread.sleep(100); } catch (Exception e) {}
    xpaint();
}Thanks for any help.

Answer 1

How would I fix that then?
I tried using
class Mgame extends Multi{
<etc>
}Which means that the program now compiles, but now the program seems to skip the Mgame.gamerun repaint() line, so the program looks like its freezed up.
New code listing is:
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
public class Multi extends Applet implements ActionListener{
Mgame game;
private Button host;
    public void init() {
    game=new Mgame();
    setLayout(null) ;
    setButtons();
    public void paint(Graphics g) {
    g.setColor(Color.green);   
    g.fillRect(0,0,700,500); 
     public void setButtons() {
    host= new Button ("Host Game");
    host.setBounds(470,395,100,30);
    add(host);
    host.addActionListener(this);
     public void actionPerformed(ActionEvent event)
              game.gamerun();
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
class Mgame extends Multi{
int ballx = 0;
public void paint(Graphics g){
    g.setColor(Color.white);   
    g.fillRect(0,0,700,500);         
    g.setColor(Color.red);   
    g.fillOval(ballx, 40, 90, 90);
public void gamerun(){
    while(true){
    ballx=ballx+1;
    if (ballx==500) {ballx=10;}
    try { Thread.sleep(100); } catch (Exception e) {}
    repaint();
}