Java treemap
import java.util.*;
class Tree_Map{
public static void main(String args[]){
TreeMap<Integer,String> map=new TreeMap<Integer,String>();
map.put(93,"Afghanistan");
map.put(213,"Algeria");
map.put(55,"Brazil");
for(Map.Entry mapTree:map.entrySet()){
System.out.println(mapTree.getKey()+" "+mapTree.getValue());
}
}
}