Application Controller Pattern

Use an Application Controller to centralize retrieval and invocation of request-processing components, such as commands and views.
Let's discuss how Application Controller Design Pattern works with examples.
This pattern is divided into a number of sections for simplicity like problem, forces, structure, solution, implementation etc.

Table of Contents

Problem
Forces
Solution
Explanation
Structure - Class Diagram, Sequence Diagram
Participants and Responsibilities
Implementation
Consequences
Applicability
Real world examples
References
Read above topics on http://www.javaguides.net/2018/08/application-controller-design-pattern-in-java.html

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