priorityqueue class code example
Example 1: priority queue in java
import java.util.PriorityQueue;
import java.util.Iterator;
class Main {
public static void main(String[] args) {
PriorityQueue<Integer> numbers = new PriorityQueue<>();
numbers.add(4);
numbers.add(2);
numbers.add(1);
System.out.print("PriorityQueue using iterator(): ");
Iterator<Integer> iterate = numbers.iterator();
while(iterate.hasNext()) {
System.out.print(iterate.next());
System.out.print(", ");
}
}
}
Example 2: priority queue max heap in java
PriorityQueue<Integer> queue = new PriorityQueue<>(10, Collections.reverseOrder());
PriorityQueue<Integer> pq =new PriorityQueue<>((x, y) -> Integer.compare(y, x));
PriorityQueue<Integer> pq = new PriorityQueue<Integer>(defaultSize, new Comparator<Integer>() {
public int compare(Integer lhs, Integer rhs) {
if (lhs < rhs) return +1;
if (lhs.equals(rhs)) return 0;
return -1;
}
});