We will present a fixed point method for the stability theorems of
functional equations of Jensen type as given by S.-M. Jung
 and Wang Jian .
 S.M. JUNG, Hyers-Ulam-Rassias stability of Jensen's equation and its application,
Proc. Amer. Math. Soc., 126 (1998), 3137-3143.
 WANG JIAN, Some further generalizations of the Hyers-Ulam
Rassias stability of functional equations, J. Math. Anal.
Appl., 263 (2001), 406-423.