NepoMain.java

public static void main(String[] args) throws InterruptedException {
    SampleLinkedQueue<Integer> q = new SampleLinkedQueue<>();
    q.offer(1);
    System.gc(); // N0, N1 are promoted
    Thread.sleep(100);
    q.poll(); // queue is empty, N0 is dead, N1 is alive

    while(true) {
        for (int i = 0; i < 4096; i++) {
          // queue size is kept at 0, but new nodes are created
          q.offer(1);
          q.poll();
        }
        // slow the test down so we can observe with tools of our choice
        Thread.sleep(100);
    }
}