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Java Collection, PriorityQueue Exercises: Convert a priority queue to an array containing all of the elements of the queue

Java Collection, PriorityQueue Exercises: Exercise-10 with Solution

Write a Java program to convert a priority queue to an array containing all of the elements of the queue.

Sample Solution:-

Java Code:

import java.util.*;

  public class Example10 {
  public static void main(String[] args) {

   // Create Priority Queue
           PriorityQueue<String> pq1 = new PriorityQueue<String>();  
   // use add() method to add values in the Priority Queue
          pq1.add("Red");
          pq1.add("Green");
          pq1.add("Black");
          pq1.add("White");
    System.out.println("Original Priority Queue: "+pq1);
   
   //Convert a linked list to array list    
   List<String> array_list = new ArrayList<String>(pq1);
   System.out.println("Array containing all of the elements in the queue: "+array_list);
    
   }    
}

Sample Output:

Original Priority Queue: [Black, Red, Green, White]                    
Array containing all of the elements in the queue: [Black, Red, Green, 
White] 

Java Code Editor:

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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