w3resource

Java Collection, PriorityQueue Exercises: Change priorityQueue to maximum priorityqueue

Java Collection, PriorityQueue Exercises: Exercise-12 with Solution

Write a Java program to change priorityQueue to maximum priorityqueue.

Sample Solution:-

Java Code:

import java.util.*;
  public class Example12 {
  public static void main(String[] args) {
  PriorityQueue<Integer> pq1 = new PriorityQueue<>(10, Collections.reverseOrder());
      
   // Add numbers in the Queue
   pq1.add(10);
   pq1.add(22);
   pq1.add(36);
   pq1.add(25);
   pq1.add(16);
   pq1.add(70);
   pq1.add(82);
   pq1.add(89);
   pq1.add(14);
   System.out.println("\nOriginal Priority Queue: "+pq1);

System.out.print("\nMaximum Priority Queue: ");
Integer val = null;
while( (val = pq1.poll()) != null) {
    System.out.print(val+"  ");
      }
	  System.out.print("\n");
  }
}

Sample Output:

Original Priority Queue: [89, 82, 70, 25, 16, 22, 36, 10, 14]          
                                                                       
Maximum Priority Queue: 89  82  70  36  25  22  16  14  10

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Convert a Priority Queue elements to a string representation.
Next: Associate the specified value with the specified key in a HashMap.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

Ref: https://bit.ly/3xXcFZt