Software Architecture Design Patterns in Java

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Software Architecture Design Patterns in Java

3. BASIC PATTERNS

INTERFACE In general, the functionality of an object-oriented system is encapsulated in the form of a set of objects. These objects provide different services either on their own or by interacting with other objects.

Example: public class MainApp { public static void main(String [] args) { SalaryCalculator c = new CategoryA(10000, 200); Employee e = new Employee ("Jennifer”,c); e.display(); c = new CategoryB(20000, 800); e = new Employee ("Shania”,c); e.display(); } }

2 .UNIFIED MODELING LANGUAGE (UML)

UML offers 12 diagrams towards representing an application’s requirements analysis and solution design.

classification

STRUCTURE DIAGRAMS 1. Class diagrams 2. Object diagrams 3. Component diagrams 4. Deployment diagrams BEHAVIOR DIAGRAMS 1. Use Case diagrams 2. Sequence diagrams 3. Activity diagrams 4. Collaboration diagrams 5. Statechart diagram MODEL MANAGEMENT DIAGRAMS 1. Packages 2. Subsystems 3. Models

CLASS DIAGRAMS Class diagrams are part of the structure diagrams and are used to describe the static structure of a system. SEQUENCE DIAGRAMS Sequence diagrams are used to depict interactions among collaborating objects in terms of messages exchanged over time for a specific result.

Class Diagram - Sequence Diagram

1 DESIGN PATTERNS: ORIGIN AND HISTORY

WHAT IS A DESIGN PATTERN?

A design pattern is a documented best practice or core of a solution that has been applied successfully in multiple environments to solve a problem that recursin a specific set of situations.

ORIGIN AND HISTORY

During the late 1970s, an architect named Christopher Alexander carried out the first known work in the area of patterns. In an attempt to identify and describe the wholeness or aliveness of quality designs, Alexander and his colleagues studied different structures that were designed to solve the same problem. He identified similarities among designs that were of high quality. He used the term pattern in the following books to refer to these similarities.