When all the elements in a Set are values from the same enum, the Set can be replaced with an EnumSet, which can be much more efficient than other sets because the underlying data structure is a simple bitmap.
public class MyClass { public enum COLOR { RED, GREEN, BLUE, ORANGE; } public void doSomething() { Set<COLOR> warm = new HashSet<COLOR>(); warm.add(COLOR.RED); warm.add(COLOR.ORANGE); } }
public class MyClass { public enum COLOR { RED, GREEN, BLUE, ORANGE; } public void doSomething() { Set<COLOR> warm = EnumSet.of(COLOR.RED, COLOR.ORANGE); } }