﻿ Java: Count the number of elements in a priority queue

# Java Collection, PriorityQueue Exercises: Count the number of elements in a priority queue

## Java Collection, PriorityQueue Exercises: Exercise-6 with Solution

Write a Java program to count the number of elements in a priority queue.

Sample Solution:-

Java Code:

``````import java.util.PriorityQueue;
public class Exercise6 {
public static void main(String[] args) {
// create an empty Priority Queue
PriorityQueue<String> pq = new PriorityQueue<String>();
// use add() method to add values in the Priority Queue
pq.add("Red");
pq.add("Green");
pq.add("Black");
pq.add("Pink");
pq.add("orange");
System.out.println("Priority Queue: " + pq);
System.out.println("Size of the Priority Queue: " + pq.size());
}
}
``````

Sample Output:

```Priority Queue: [Black, Pink, Green, Red, orange]
Size of the Priority Queue: 5```

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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