My java code is stuck in loop when it should end, i put a while that cant exit is condition

I was asked to write a java method executeInParallel that executes without active waiting and without race conditions(so i thought that i needed an ArrayBlockingQueue).I was also asked to not use other classes than the ones already in my code

import java.util.concurrent.ArrayBlockingQueue;

public class ParallelExecutor {
    public static void executeInParallel(Runnable[] runnables, int K) {
        if (K <= 0)
            throw new IllegalArgumentException("Can't execute zero or less concurrent runnables");
        if (runnables == null || runnables.length == 0)
            throw new IllegalArgumentException("Must provide something to run");

        ArrayBlockingQueue<Runnable> taskQueue = new ArrayBlockingQueue<>(K); // Extra space for end markers

        // Start the producer
        Thread producer = new Thread(() -> {
            try {
                for (Runnable r : runnables) {
                    taskQueue.put(r); // Put a runnable in the queue
                }

            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        });
        producer.start();

        // Start the consumer threads
        K=Math.min(runnables.length,K);
        Thread[] consumers = new Thread[K];
        for (int i = 0; i < K; i++) {
            consumers[i] = new Thread(() -> {
                try {
                    Runnable r;
                    while((r= taskQueue.take())!=null){
                        r.run();
                    }
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                } catch (Exception e) {
                    e.printStackTrace(); // Handle exceptions as needed
                }
            });
            consumers[i].start();
        }

        // Wait for the producer to finish
        try {
            producer.join();
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }

        // Wait for all consumers to finish
        for (Thread consumer : consumers) {
            try {
                consumer.join();
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }
    }

    public static void main(String[] args) {
        // Example usage
        Runnable[] tasks = new Runnable[20];
        for (int i = 0; i < tasks.length; i++) {
            final int index = i;
            tasks[i] = () -> {
                System.out.println("Task " + index + " is running.");
                try {
                    Thread.sleep(1000); // Simulate work that takes 1 second
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
                System.out.println("Task " + index + " is finished.");
            };
        }
        executeInParallel(tasks, 3); // Execute tasks in parallel, 3 at a time
    }
}

and the code loops in this part after all the r.run are executed:

 while((r= taskQueue.take())!=null){
       r.run();
    }

How i can remove the loop without adding active wait(i need passive waiting and i was asked to not add other classes like ExecutorService etc.)?

I tried removing the while with something else but i was asked to have k run in parallel so i cant do it without more threads i think

The taskQueue.take() may wait forever until the new task put in the taskQueue ,here is the source code:

public E take() throws InterruptedException {
        final ReentrantLock lock = this.lock;
        lock.lockInterruptibly();
        try {
            while (count == 0)
                // continue waiting
                notEmpty.await();
            return dequeue();
        } finally {
            lock.unlock();
        }
    }

so consider using taskQueue.poll(0,TimeUnit.SECONDS), so it could immediately return task or null.