Groovy Day 2 : Differences in term of readability between Java and Groovy

For this article, we will see the differences of readability between an "old" language (Java) and a dynamic language (Groovy). You will see at first the evolution of Java to try to become more readable for the novice (and less tiring for the advance developper). The second part is the Groovy version of the same code and you will see the difference very easily.
I decided to use a simple example of a creation of HashMap and store in it the names of the seasons and the related adjectives.

First code snippet is a Java 1.4 code.

class HashMapJavaShow {
   public static void main(String[] args) {
      // creation of the hashmap
      HashMap<String, String> seasons = new HashMap<String, String>();
      
      // insertion of data, key => value
      // in this example we take the name of the season as key
      // and the related adjective as value
      seasons.put("spring", "vernal");
      seasons.put("summer", "estival");
      seasons.put("automn", "autumnal");
      seasons.put("winter", "hibernal");
      
      // before 1.5 we were forced to use an iterator
      Iterator iter = seasons.iterator();
      // loop until the iterator has not more element
      while(iter.hasNext()){
         // retrieve the current element and display it
         // using its default method toString()
         System.out.println(iter.next());
      }
   }
}