Java TreeMap Set View Of Keys

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import java.util.Iterator;
import java.util.TreeMap;
import java.util.Set;

public class JavaTreeMapSetView {

	public static void main(String[] args) {

		TreeMap treeMap = new TreeMap();

		treeMap.put("1", "One");
		treeMap.put("3", "Three");
		treeMap.put("2", "Two");

		Set set = treeMap.keySet();

		System.out.println("Set created from TreeMap Keys contains :");
		Iterator iterator = set.iterator();
		while (iterator.hasNext())
			System.out.println(iterator.next());

		set.remove("1");

		boolean blnExists = treeMap.containsKey("1");
		System.out.println("Does TreeMap contain 1 ? " + blnExists);
	}
}

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