﻿ Java: Compare two priority queues

# Java Collection, PriorityQueue Exercises: Compare two priority queues

## Java Collection, PriorityQueue Exercises: Exercise-7 with Solution

Write a Java program to compare two priority queues.

Sample Solution:-

Java Code:

``````import java.util.PriorityQueue;
public class Exercise7 {
public static void main(String[] args) {
// Create a empty 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("First Priority Queue: "+pq1);
PriorityQueue<String> pq2 = new PriorityQueue<String>();
pq2.add("Red");
pq2.add("Pink");
pq2.add("Black");
pq2.add("Orange");
System.out.println("Second Priority Queue: "+pq2);
//comparison output in Priority Queue
for (String element : pq1){
System.out.println(pq2.contains(element) ? "Yes" : "No");
}
}
}
``````

Sample Output:

```First Priority Queue: [Black, Red, Green, White]
Second Priority Queue: [Black, Orange, Pink, Red]
Yes
Yes
No
No```

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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