public interface Group extends Principal
This interface is used to represent a group of principals. (A principal represents an entity such as an individual user or a company).
Note that Group extends Principal. Thus, either a Principal or a Group can be passed as an argument to methods containing a Principal parameter. For example, you can add either a Principal or a Group to a Group object by calling the object's addMember method, passing it the Principal or Group.
boolean addMember(Principal user)
Adds the specified member to the group.
user - the principal to add to this group.boolean removeMember(Principal user)
Removes the specified member from the group.
user - the principal to remove from this group.boolean isMember(Principal member)
Returns true if the passed principal is a member of the group. This method does a recursive search, so if a principal belongs to a group which is a member of this group, true is returned.
member - the principal whose membership is to be checked.Enumeration<? extends Principal> members()
Returns an enumeration of the members in the group. The returned objects can be instances of either Principal or Group (which is a subclass of Principal).
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