TreeSet : toArray: Copy Set Data to Object Array

Object[] toArray()

Returns an array containing all of the elements in this set. The order how the Elements from the set copied is totally depends on the iterator implementation.

import java.util.*;
class TreeSetCopyToArray{
 public static void main(String args[]){
  TreeSet<Double> mySet = new TreeSet<> ();
  Object myArray[];
  
  /* Add Elements to the Set */
  mySet.add(55.6);
  mySet.add(10.01);
  mySet.add(5.01);
  mySet.add(-100.123);
  
  /* Copy Elements to the myArray */
  myArray = mySet.toArray();
  
  /* Display the elements of the Array */
  System.out.println("Elements in the Array are");
  for(Object obj : myArray)
   System.out.println(obj);
 }
}

Output

Elements in the Array are
-100.123
5.01
10.01
55.6

Observe the Output, the Elements are not copied to the “myArray” as the way they inserted. Elements are copied to the Array based on the iterator.

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