How to use PriorityQueue
Apr 03, 2015 in Algorithms, Java
From http://stackoverflow.com/questions/683041/java-how-do-i-use-a-priorityqueue
// TestPQ.java import java.util.Comparator; import java.util.PriorityQueue; public class TestPQ { public static void main(String[] args) { Comparator<String> comparator = new StringLengthComparator(); PriorityQueue<String> queue = new PriorityQueue<String>(10, comparator); queue.add("short"); queue.add("very long indeed"); queue.add("medium"); while (queue.size() != 0) { System.out.println(queue.remove()); } } }
// StringLengthComparator.java import java.util.Comparator; public class StringLengthComparator implements Comparator<String> { @Override public int compare(String x, String y) { // Assume neither string is null. Real code should // probably be more robust // You could also just return x.length() - y.length(), // which would be more efficient. if (x.length() < y.length()) { return -1; } if (x.length() > y.length()) { return 1; } return 0; } }