Sorting in PriorityQueue regaring second item which is long or double data type in Java

Question

In Java if we want to sort based on second item in PriorityQueue using Comparable interface The Code will be like this:

import java.util.*;
public class Main{

    public static class Pair implements Comparable{
        int node;
        int weight;
        public Pair(int node,int weight){
            this.node = node;
            this.weight = weight;
        }

        @Override
        public int compareTo(Object o) {
            return this.weight - ((Pair)o).weight;
        }
    }


    public static void main(String [] args){
        PriorityQueue<Pair> pq = new PriorityQueue<Pair>();
        pq.add(new Pair(2,3));
        pq.add(new Pair(2,3));
    }
}

But, if the weight data type will be long or double how to handle for sorting priorityQueue regarding this case?

Need Help! Thanks in advance.

Answer 1

public static class Pair implements Comparable<Pair>{
    int node;
    Double weight;
    public Pair(int node,double weight){
        this.node = node;
        this.weight = weight;
    }


    @Override
    public int compareTo(Pair o) {
        return this.weight.compareTo(o.weight);
    }
}