PriorityBlockingQueue method in Java
``` import java.util.concurrent.PriorityBlockingQueue; import java.util.*; class Main { public static void main(String args[]) { Queue<Integer> pbq = new PriorityBlockingQueue<Integer>(); pbq.add(10); pbq.add(20); System.out.println(pbq.peek()); System.out.println(pbq.poll()); System.out.println(pbq.peek()); } } ```