TreeSet, SortedSet and HashSet : TreeSet « Collections Data Structure « Java

1. Java
2. Collections Data Structure
3. TreeSet

TreeSet, SortedSet and HashSet

   

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

class SetDemo {
  public static void main(String[] args) {
    String[] letters = { "A", "B", "C", "D", "E" };

    Set s = new HashSet();

    for (int i = 0; i < letters.length; i++)
      s.add(letters[i]);

    if (!s.add(letters[0]))
      System.out.println("Cannot add a duplicate.\n");

    Iterator iter = s.iterator();
    while (iter.hasNext())
      System.out.println(iter.next());

    System.out.println("");

    SortedSet ss = new TreeSet();

    for (int i = 0; i < letters.length; i++)
      ss.add(letters[i]);

    if (!ss.add(letters[0]))
      System.out.println("Cannot add a duplicate.\n");

    iter = ss.iterator();
    while (iter.hasNext())
      System.out.println(iter.next());
  }
}

   
    
    
  

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