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There is a newer version: 8.6.0.37351


  When all the keys of a Map are values from the same enum, the Map can be replaced with an EnumMap,
  which can be much more efficient than other sets because the underlying data structure is a simple array.


Noncompliant Code Example
public class MyClass {

  public enum COLOR {
    RED, GREEN, BLUE, ORANGE;
  }

  public void mapMood() {
    Map<COLOR, String> moodMap = new HashMap<COLOR, String> ();
  }
}


Compliant Solution
public class MyClass {

  public enum COLOR {
    RED, GREEN, BLUE, ORANGE;
  }

  public void mapMood() {
    EnumMap<COLOR, String> moodMap = new EnumMap<COLOR, String> (COLOR.class);
  }
}