question: public void makeImmutable ( ) { mutable = false ; if ( authnContextClassRef != null ) { authnContextClassRef = Collections . unmodifiableList ( authnContextClassRef ) ; } if ( authnContextDeclRef != null ) { authnContextDeclRef = Collections . unmodifiableList ( authnContextDeclRef ) ; } return ; }
target:  Makes the obejct immutable