Adds a principal to the list of owners.paramcaller the invoking principal.paramowner the owner to added.return{@code true} if the owner was added, {@code false} if it was already an owner.throwsNotOwnerException if the invoking principal is not an owner.sinceAndroid 1.0
Removes a principal from the list of owners.paramcaller the invoking principal.paramowner the owner to be removed.return{@code true} if the owner was removed, {@code false} if it was not an owner.throwsNotOwnerException if the invoking principal is not an owner.throwsLastOwnerException if the owner to be removed is the last owner and hence removing it would make this object owner-less.sinceAndroid 1.0
Checks whether the specified principal is an owner of this object.paramowner the principal to check.return{@code true} if the specified principal is an owner, otherwise {@code false}.sinceAndroid 1.0