Mega Code Archive
Use a Comparator to create a PriorityQueue for messages
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import java.util.Comparator;
import java.util.PriorityQueue;
enum ProductQuality {
High, Medium, Low
}
class Product implements Comparable<Product> {
String name;
ProductQuality priority;
Product(String str, ProductQuality pri) {
name = str;
priority = pri;
}
public int compareTo(Product msg2) {
return priority.compareTo(msg2.priority);
}
}
class MessageComparator implements Comparator<Product> {
public int compare(Product msg1, Product msg2) {
return msg2.priority.compareTo(msg1.priority);
}
}
public class Main {
public static void main(String args[]) {
PriorityQueue<Product> pq = new PriorityQueue<Product>(3);
pq.add(new Product("A", ProductQuality.Low));
pq.add(new Product("B", ProductQuality.High));
pq.add(new Product("C", ProductQuality.Medium));
Product m;
while ((m = pq.poll()) != null)
System.out.println(m.name + " Priority: " + m.priority);
PriorityQueue<Product> pqRev = new PriorityQueue<Product>(3, new MessageComparator());
pqRev.add(new Product("D", ProductQuality.Low));
pqRev.add(new Product("E", ProductQuality.High));
pqRev.add(new Product("F", ProductQuality.Medium));
while ((m = pqRev.poll()) != null)
System.out.println(m.name + " Priority: " + m.priority);
}
}
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