Java Program to get all keys and all Values from a Tree Map

import java.util.*;  
public class demo1 
{  
 public static void main(String args[])
 {  
  TreeMap<Integer,String> treemap=new TreeMap<Integer,String>();      
  treemap.put(1, "C#");
  treemap.put(2, "C++");
  treemap.put(3, "Java");
  treemap.put(4, "Python");
  treemap.put(5, "Perl");
    
  Set keys = treemap.keySet();
  System.out.println("Keys in treemap are:" +keys);
  System.out.println("Values in treemap are:" +treemap.values());       
 }
}