TreeSet - iterate using iterator, listIterator, Enumeration and enhanced for loop







TreeSet - iterate using iterator, listIterator, Enumeration and enhanced for loop.



import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
/** Copyright (c), AnkitMittal JavaMadeSoEasy.com */
public class TreeSetTest {
   public static void main(String args[]) {
     
      Set<String> treeSet=new TreeSet<String>();
      treeSet.add("javaMadeSoEasy");
      treeSet.add("ankit");
     
      System.out.println("-------use iterator-------");
          Iterator<String> iterator=treeSet.iterator();
      while(iterator.hasNext()){
         System.out.println(iterator.next());
      }
     
      System.out.println("-------use Enumeration-------");
          Enumeration<String> listEnum=Collections.enumeration(treeSet);   
   while(listEnum.hasMoreElements()){
      System.out.println(listEnum.nextElement());
   }
  
   System.out.println("-------use enhanced for loop-------");
          for(String string:treeSet){
         System.out.println(string);
      }
     
   }
}
/*OUTPUT
-------use iterator-------
ankit
javaMadeSoEasy
-------use Enumeration-------
ankit
javaMadeSoEasy
-------use enhanced for loop-------
ankit
javaMadeSoEasy
*/



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