import java.util.Map;
import java.util.TreeMap;
public class TreeMapKeyCount {
public static void main(String[] args) {
Map<Integer, String> tm = new TreeMap<Integer,String>();
// add key and values
tm.put(1,”java”);
tm.put(2,”cpp”);
tm.put(3,”php”);
tm.put(4,”c”);
tm.put(5, “mysql”);
//print treemap
System.out.println(“TreeMap Is=”+tm);
//Returns the number of key-value mappings in this map
System.out.println(“size of treemap = “+tm.size());
}
}
Output:
TreeMap Is={1=java, 2=cpp, 3=php, 4=c, 5=mysql}
size of treemap = 5