import java.util.TreeMap;
public class Main {
public static void main(String[] args) {
TreeMap treeMap = new TreeMap();
System.out.println("Size of TreeMap : " + treeMap.size());
treeMap.put("1", "One");
treeMap.put("2", "Two");
treeMap.put("3", "Three");
System.out.println("Size of TreeMap after addition : " + treeMap.size());
treeMap.remove("2");
System.out.println("Size of TreeMap after removal : " + treeMap.size());
}
}