What you can do with a TreeSet

         
// : c11:SortedSetDemo.java
// What you can do with a TreeSet.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

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

public class SortedSetDemo {

  public static void main(String[] args) {
    SortedSet sortedSet = new TreeSet(Arrays
        .asList("one two three four five six seven eight".split(" ")));
    System.out.println(sortedSet);
    Object low = sortedSet.first(), high = sortedSet.last();
    System.out.println(low);
    System.out.println(high);
    Iterator it = sortedSet.iterator();
    for (int i = 0; i <= 6; i++) {
      if (i == 3)
        low = it.next();
      if (i == 6)
        high = it.next();
      else
        it.next();
    }
    System.out.println(low);
    System.out.println(high);
    System.out.println(sortedSet.subSet(low, high));
    System.out.println(sortedSet.headSet(high));
    System.out.println(sortedSet.tailSet(low));
  }
} ///:~

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What you can do with a TreeSet : Set « Collections Data Structure « Java

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