Many students feel that Java programming is difficult. It attributes to the difficulty of programming with Java frameworks and the problem of the programming education environment. This paper proposes a method that supports learnersto understand Java frameworks. The method provides self-study support environment to bridge a lecture and a programming exercise. This environment uses the sequence diagram to provide a learner with knowledge to describe messages. The method enables to guide a learner, checking code dependency and reference of variables while the learner specifies his program. An experiment has proved that the method improves understanding of learners.