What is the result(PriorityQueue)? : Questions « Utility Classes « SCJP

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import java.util.PriorityQueue;

public class MainClass {
  public static void main(String[] argv) {
    PriorityQueue<String> pq = new PriorityQueue<String>();
    pq.add("2");
    pq.add("4");
    System.out.print(pq.peek() + " ");
    pq.offer("1");
    pq.add("3");
    pq.remove("1");
    System.out.print(pq.poll() + " ");
    if (pq.remove("2"))
      System.out.print(pq.poll() + " ");
    System.out.println(pq.poll() + " " + pq.peek());

  }
}