public Collection<Realm> getRealms() {
        return this.realms;
    }
Returns the realms wrapped by this <code>Authorizer</code> which are consulted during an authorization check.

@return the realms wrapped by this <code>Authorizer</code> which are consulted during an authorization check.
core/src/main/java/org/apache/shiro/authz/ModularRealmAuthorizer.java