Sunday 29 July 2012

Remove all elements from Java TreeSet example


This Java Example shows how to remove all elements contained in Java TreeSet or clear TreeSet object using clear method. It also shows how  to check whether TreeSet object is empty or not using isEmpty method.

import java.util.TreeSet;

public class RemoveAllElementsFromTreeSetExample {

 public static void main(String[] args) {

  // create object of TreeSet
  TreeSet tSet = new TreeSet();

  // add elements to TreeSet object
  tSet.add(new Integer("1"));
  tSet.add(new Integer("2"));
  tSet.add(new Integer("3"));

  System.out.println("TreeSet before removal : " + tSet);

  /**
   * To remove all elements from Java TreeSet or to clear TreeSet object
   * use, void clear() method. This method removes all elements from
   * TreeSet.
   **/

  tSet.clear();
  System.out.println("TreeSet after removal : " + tSet);

  /**
   * To check whether TreeSet contains any elements or not use boolean
   * isEmpty() method. This method returns true if the TreeSet does not
   * contains any elements otherwise false.
   **/

  System.out.println("Is TreeSet empty ? " + tSet.isEmpty());

 }
}


The output is:


TreeSet before removal : [1, 2, 3]
TreeSet after removal : []
Is TreeSet empty ? true

No comments:

Post a Comment