Java EnumMap.keySet()

public Set <K> keySet()

/*  w  w  w  .j  a v a  2  s  . c  o  m*/

import java.util.*;

enum Tutorial {

   CSS, Python, PHP, Java, Javascript
};


public class Main {

   public static void main(String[] args) {
      EnumMap<Tutorial, String>  map =
              new EnumMap<Tutorial, String> (Tutorial.class);

      map.put(Tutorial.CSS, "1");
      map.put(Tutorial.Python, "2");
      map.put(Tutorial.PHP, "3");
      map.put(Tutorial.Java, "4");

      System.out.println(map);

      // create a new set and return the set view of the keys contained
      Set<Tutorial>  set = map.keySet();

      System.out.println("Set: " + set);
   }
}