...
import java.applet.*;
import java.io.*;
import java.sql.*;
import java.util.*;

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

class GraphPanel extends Panel implements Runnable {
  ...
  Thread relaxer = new Thread(this);
  Graph graph;
  ...
  GraphPanel(Graph graph){
    ..
    relaxer.start();
    this.graph = graph;
    ...
  }
    
  public void run() {
    Thread me = Thread.currentThread();
    while (relaxer == me) {
      try{  
        ..
        graph.proc_pbar();
        .. 
      }
      catch(Exception ex){   }
      try {
        Thread.sleep(ThreadSleep);
      }catch(InterruptedException e) { break;  }
    }
   }
    
   public synchronized void update(Graphics g) {
     ...
   }

   public void start() {
     ...
   }

   public void stop() {
     ..
   }
}

public class Graph extends Applet {
  ...  
  JProgressBar pBar;
  GraphPanel panel;
  ..
  
  public void init() {
    ..
    pBar = new JProgressBar(JProgressBar.HORIZONTAL);
    ... 
    pBar.setStringPainted(true);
    ..
  }

  void proc_pbar{
    ..
    pBar.setValue(Gr.pBar.getValue() +  1 );
    ..
  }
  ..
}