How TreeSet checks for Duplicates

Question

I am checking how TreeSet checks for duplicate elements and have the following code

  import java.util.*;

  public class TreeDemo{

    public static void main(         


        

Answer 1

a comparator return < 0, 0 or > 0... So equals is implemented by compareTo returning 0. Thus

if (node1.compareTo(node2) == 0) 

then the node is already in the set