Comparator

comparator.java

import java.util.Comparator;
import java.util.PriorityQueue;

public class Comp {
	public static void main(String[] args) {
		PriorityQueue<Integer> q = new PriorityQueue<>(new Comparator<Integer>() {
			@Override
			public int compare(Integer o1, Integer o2) {
				return sig(o1 - o2);
			}
			private int sig(int a) {
				return a == 0 ? 0 : a > 0 ? 1 : -1;
			}
		});
		
		// Lambda version
		PriorityQueue<Integer> q2 = new PriorityQueue<>((a, b) -> a - b == 0 ? 0 : a - b > 0 ? 1 : -1);
		
		for (int i = 0; i < 100; i++) {
			q.add((int)(Math.random() * 1000));
		}
		
		System.out.println(q);
		
		System.out.println(q.comparator().compare(0, 1));
		System.out.println(q.comparator().compare(1, 0));
		System.out.println(q.comparator().compare(0, 0));
		
	}
}