Using SortedSets and TreeSets. - Java Collection Framework

Java examples for Collection Framework:SortedSet

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Description

Using SortedSets and TreeSets.

Demo Code

import java.util.Arrays;
import java.util.SortedSet;
import java.util.TreeSet;

public class Main 
{
   public static void main(String[] args)
   {/*from w  ww  .ja  v a 2  s  .c  o  m*/
      // create TreeSet from array colors
      String[] colors = {"yellow", "green", "black", "tan", "grey",
         "white", "orange", "red", "green"};
      SortedSet<String> tree = new TreeSet<>(Arrays.asList(colors));

      System.out.print("sorted set: ");
      printSet(tree);

      // get headSet based on "orange"
      System.out.print("headSet (\"orange\"):  ");
      printSet(tree.headSet("orange"));

      // get tailSet based upon "orange"
      System.out.print("tailSet (\"orange\"):  ");
      printSet(tree.tailSet("orange"));

      // get first and last elements
      System.out.printf("first: %s%n", tree.first());
      System.out.printf("last : %s%n", tree.last());
   } 

   // output SortedSet using enhanced for statement
   private static void printSet(SortedSet<String> set)
   {
      for (String s : set)
         System.out.printf("%s ", s);

      System.out.println();
   } 
}

Result


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