Consumer/Producer with random numbers

Hi, i am stuck with a threads problem and I would greatly appreciate any help from you guys:

I have to create two threads, one which produces random numbers and a second one which prints them. Between the threads should be a fixed-size buffer (if the buffer is empty, the consumer has to wait, if the buffer is full, the producer has to wait). This should be implemented twice:

a) system-programmer's view: use wait(), notifyAll(), synchronized{} (use an array for the buffer)
b) application-programmer's view: use suitable classes from the Java library to implement the buffer


As for a), I tried to write the producer somehow like this, but it seems there is something wrong with it:

Code:

---

public class Producer implements Runnable {
       
        public void run(){
                                               
                        int size=10;
                        int i;
                        double numbers[] = new double[size];
                               
                        for (i=0; i<size; i++) {
                                numbers[i] = Math.random()*99 + 1;
                                }
            }
                }

---

Also, I am stuck with the buffer and the consumer. How do I use the numbers from the producer? I am really lost ... :(doh):

As for b), I know that BlockingQueue would be appropriate. I tried to write the producer like this, but again, it doesn't seem right:

Code:

---

import java.util.*;
import java.util.concurrent.BlockingQueue;

class Producer2 implements Runnable {
 
  private final BlockingQueue queue;
 
  Producer2 (BlockingQueue q) { queue = q; }

  public void run() {
    try {
      while(true) { queue.put(produce()); }
    }
       
        catch (InterruptedException ex) { System.out.println("Something went wrong!"); }
  }
  Object produce() {
 
                        int size=100;
                        int i;
                        double numbers[] = new double[size];
                               
                        for (i=0; i<size; i++) {
                                numbers[i] = Math.random()*99 + 1;
                                }
          }
 }

---

I am seriously lost at this point. Any help or hint would be greatly appreciated. Thanks in advance!

nevermind, I was able to figure it out myself :8):