Consumer/Producer with random numbers

[devo22]

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:

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 ...

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:

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!

[devo22]

nevermind, I was able to figure it out myself