Set Example 1
import org.apache.commons.collections.set.MapBackedSet; import java.util.Map; import java.util.Set; import java.util.HashMap; import java.util.Iterator; public class SetExampleV1 { public static void main(String args[]) { // create a Map Map map = new HashMap(); map.put("Key1", "Value1"); // create the decoration Set set = MapBackedSet.decorate(map); map.put("Key2", "Any dummy value"); set.add("Key3"); Iterator itr = set.iterator(); while(itr.hasNext()) { System.err.println(itr.next()); } } }