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.
public class MyClass { public enum COLOR { RED, GREEN, BLUE, ORANGE; } public void mapMood() { Map<COLOR, String> moodMap = new HashMap<COLOR, String> (); } }
public class MyClass { public enum COLOR { RED, GREEN, BLUE, ORANGE; } public void mapMood() { EnumMap<COLOR, String> moodMap = new EnumMap<> (COLOR.class); } }