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());
    }
}
```