TreeMap size()
int size()- Returns the number of key-value mappings in this map.
import java.util.TreeMap;
public class Main {
public static void main(String[] args) {
TreeMap<String,String> treeMap = new TreeMap<String,String>();
treeMap.put("1", "One");
treeMap.put("2", "Two");
treeMap.put("3", "Three");
treeMap.clear();
System.out.println(treeMap.size());
}
}