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Working with Subsets

Since a TreeSet is ordered, its subset is also ordered. The two that are simplest to explain are headset() and tailSet(): public SortedSet headSet(Object toElement) public SortedSet tailSet(Object fromElement) import java.util.Arrays; import java.util.TreeSet; public class MainClass {   public static void main(String args[]) throws Exception {     String elements[] = { "A", "C", "D", "G", "F" };     TreeSet set = new TreeSet(Arrays.asList(elements));     System.out.println(set.headSet("D"));     System.out.println(set.tailSet(""));   } } [A, C] [A, C, D, F, G]