Correct Thread organization.

Hi,
I am having some problems in my program, I'd say it is simliar to the producer consumer idea. It involved 4 classes but I will just paste the parts relevant to the threads and explain. Basically I am making a program that performs a line graph every second. One class parses a file for the data to be graphed and when it collects for one second, the other class stores it in a Hash table and allows the class to get() it. And then it continues..
Class Matrix handles starting the threads..

This is the class that goes through a file and gets the data to be graphed,, in this case port numbers. It also checks to see what the next second is and whether we reached that or not. This can be compared to the producer class in java examples. I have done a lot of editing to make it easier to read, if someone would like the full code I can paste that here too.

class fileParser extends Thread{
private int number;
private String filename;
public fileParser(String name, int number) {
filename=name;
this.number=number;
}
public void run() {
try{
variables...etc.
byte[] fileLine=new byte[100];
int nextSecond;
int[] port=new int[3700];
boolean hash=false;
FileInputStream inputfile = new FileInputStream(filename);
        BufferedInputStream is = new BufferedInputStream(inputfile);
for loop (i)
is.read(fileLine, 0, 100);
//extract the packet recieved time and get the port number.
//packetTime and dest_port;
//figure out where to move file pointer to get to next packet.
 
//here is I where I figure out what my next second is.. that is the next delta T. beccause my 
goal is when I get to that, I need to set a boolean to true (hash).. which allows in the other 
class to let the graph class take the array and use it to graph for that time step. if my first 
packet has a timestamp of 0, I manually set nextSecond to 1. I make sure array is zeroed out 
also.
if(i==0) {
nextSecond=(int)Math.ceil(packetTime);

if(packetTime==0) nextSecond=1;

for(y =0; y<3700; y++) {
port[y]=0;
}

}//end if
Packet p = new Packet(packet parameters...,dest_pt, i, nSec, port (the array), 
hash(the boolean));

if(hash==true) {
emptyArray(port);
hash=false;
}
      //if hash was true then we sent off the array for graphing and can empty the array etc.

//ok so this handles cases after the first iteration, and i set the NEXTSECOND when hash is 
true because that is when its time to get the next one.
else if(i>1){ 
nextSecond=(int)Math.ceil(packetTime);
}

//ok sO I am keeping track of packets on each port so I increment it.
port[dest_pt]++;
try {
  
                sleep((int)( 500));
            } catch (InterruptedException e) { }
 
}ok the end

This class can be compared to Cubbyhole in the java examples. It adds the number of ports to the hash when each second passes and its supposed to allow the get command to happen which is used by the class that graphs (coming next called example2A)

class Packet{
private Hashtable packets = new Hashtable();
private boolean available = false;
public Packet () { You will get this when you see class Matrix}

public Packet( int ip, int sp, int dp, int i, PrintWriter pw, int oldhour, int nextSec, int[] 
ports, boolean send)
  {
//this means a delta T has been reached.. therefore do the hash thing and get it ready to send.
if(send==true){
 for(x=0; x<3700; x++){
  if(ports[x]!=0) { //if we have some packets on that port..
  packets.put(new Integer(x),new Integer(ports[x]));
  }
  else {

continue;
  }
  }//end for
  //ready for the get method to happen

try {
wait();
}catch (InterruptedException e) { 
        available = true;
        notifyAll();
  }
}//end public packet
//a method that allows the graph class to get the hashtable
public synchronized Hashtable get() {
 
while (available == false) {
            try {
                wait();
            } catch (InterruptedException e) { }
        }//end while
available = false;
        notifyAll();
        return packets;
    }
}

This class was an applet but I converted it.. for graphing. so it implements runnable.

public class example2A extends Applet implements Runnable {
public void init() {

stuff in here.. to make window etc. 
}
      public void start() {
if(runner == null) {
          runner = new Thread(this);
          runner.start();
        }
      }

public void stop() {
          runner = null;
        
      }

public void run() {
  
Thread thisThread = Thread.currentThread();
              int i =0;
              double data[] = new double[2];  
              Graphics g;
      Hashtable pk = new Hashtable();

count++;
        if(count >= maximum) {data1.delete(0,0); data2.delete(0,0);}
  
// CRASHES at this line pk=packet.get(); so this is commented

//  System.out.println("ex2A #" + this.number
                   //            + " got: " + pk.elements()); this gave EXCEPTION
   
RIGHT NOW JUST PUTTING IN RANDOM NUMBERS TO GRAPH> WORKED BEFORE BUT NOT NOW I GUESS DUE TO THE THREADING STUFF
                   data[1] = (random.nextDouble())*100.0;
                   data[0] = count;   
                   data_2[1]= (random.nextDouble())*100.0;
   data_2[0] = count;   
                   
// DATE GETS APPENEDED I DELETED THIS PART

// IGNORE THIS TOO.   
                   g = graph.getGraphics();
   if( osi == null || iwidth != graph.getSize().width
                                   || iheight != graph.getSize().height  ) {
                       iwidth = graph.getSize().width;
                       iheight = graph.getSize().height;
                       osi = graph.createImage(iwidth,iheight); //here
                       osg = osi.getGraphics();
                   }
                   osg.setColor(this.getBackground());
                   osg.fillRect(0,0,iwidth,iheight);
                   osg.setColor(g.getColor());
                   osg.clipRect(0,0,iwidth,iheight);
 
                   graph.update(osg);
                   g.drawImage(osi,0,0,graph);
// OK SO I HAVE IT WAIT AND NOTIFY IS SUPPOSED TO TELL IT TO DO THE GET??
try {
wait();
}catch (InterruptedException e) { }
  
}
}

thanks for any help. I know so far it freezes in class Packet when I have just reached a second and I am adding data to the hash table.. it gets to my print statement of we are at wait then it does not continue.