Get Head Set from Java TreeSet

    /*
      Get Head Set from Java TreeSet example
      This Java Example shows how to get the portion of TreeSet containing the values
      less than the specified value using headSet method of Java TreeSet class.
    */
    package org.best.example;
    import java.util.SortedSet;
    import java.util.TreeSet;
    
    public class GetHeadSetFromTreeSetExample {
    
    public static void main(String[] args) {
    
    //create TreeSet object
    TreeSet tSet = new TreeSet();
    
    //add elements to TreeSet
    tSet.add("1");
    tSet.add("3");
    tSet.add("2");
    tSet.add("5");
    tSet.add("4");
    
    /*
      To get a Head Set from Java TreeSet use,
      SortedSet headSet(Object fromElement) method of Java TreeSet class.
    
      This method returns the portion of TreeSet containing elements less than
      fromElement.
    
      Please note that, the SortedSet returned by this method is backed by
      the original TreeSet. So any changes made to SortedSet will be
      reflected back to original TreeSet.
      */
    
    SortedSet sortedSet = tSet.headSet("3");
    
    System.out.println("Head Set Contains : " + sortedSet);
    
    }
    }
    
    /*
    Output would be
    Head Set Contains : [1, 2]
    */