java.util.TreeSet.comparator() Method

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Description

The comparator() method returns the comparator used to order the elements in this set, or null if this set uses the natural ordering of its elements.

Declaration

Following is the declaration for java.util.TreeSet.comparator() method.

public Comparator<? super E> comparator()

Parameters

NA

Return Value

The method call returns the comparator used to order the elements in this set, or null if this set uses the natural ordering of its elements.

Exception

NA

Example

The following example shows the usage of java.util.TreeSet.comparator() method.

package com.tutorialspoint;

import java.util.Iterator;
import java.util.TreeSet;

public class TreeSetDemo {
   public static void main(String[] args) {

      // creating TreeSet 
      TreeSet <Integer>tree = new TreeSet<Integer>();
      TreeSet <Integer>treecomp = new TreeSet<Integer>();

      // adding in the tree
      tree.add(12);
      tree.add(13);
      tree.add(14);
      tree.add(15);
      tree.add(16);
      tree.add(17);

      // using comparator
      treecomp = (TreeSet)tree.comparator();

      if(treecomp!=null) {
         for (Integer element : treecomp)
         System.out.println(element + " ");
      } else {
         System.out.println("treecomp value: "+treecomp); 
         System.out.println("So it is using natural ordering");
      }
   }    
}

Let us compile and run the above program, this will produce the following result.

treecomp value: null
So it is using natural ordering