Demonstrace problémů při refaktoraci na příkladu modularizace části programu BlueJ++

The main goal of this thesis is to demonstrate the problems of refactoring of larger pro-grams on an example of modularization of part of the BlueJ++ program.BlueJ ++ is a separate fork of the BlueJ learning development environment modified to maximize teaching support according to Architecture First methodology. The BlueJ++ architecture inherited from the BlueJ environment is unsatisfactory, because the application cannot be easily expanded.The first part of this thesis describes the refactoring and introduces the reader to modulari-zation and modules. It also introduces Java services and modules.The next part of this thesis contains an analysis of the initial state of the BlueJ++ architec-ture, analyzes the initial state of the embedded editor and its interconnection with the rest of the program. This is followed by software design, which demonstrates some of the modularization issues and their solutions.The result of this thesis is an independent editor module, which communicates with the application core via defined API. Realization of the API design using set of refactorings solved tight coupling between the editor and the application core. Use of the service solved the imminent circular dependencies between editor module and the application core. Be-cause of the new API design, the editor module can be replaced at any time without any loss of functionality.