How to hide an Enum Value in Java?

Question

I have a Enum class with rights.

public enum UserRight {
    SYSTEMMANAGEMENT, USERADMINISTRATION, ROLEADMINISTRATION, 
    STRUCTUREADMINISTRATION, DOCUMENTADMINISTRATION;
}

Now i want to load all my rights into a list except SYSTEMMANAGEMENT. I do it now like this:

availrightslist.addAll(Arrays.asList(UserRight.values()));

How can I load all rights without the SYSTEMMANAGEMENT right?

Answer 1

您可以在添加所有内容后将其删除：

availrightslist.remove(UserRight.SYSTEMMANAGEMENT);

或使用一些EnumSet 魔术：

Set<UserRight> rights = EnumSet.complementOf(EnumSet.of(UserRight.SYSTEMMANAGEMENT));

通常，如果您有个Collection，enum建议您使用EnumSet。因为UserRight两次都没有意义。