Why we use messaging systems?

1. Static Factory Method instead constructors.

Good old traditional way to create object is using constructor. Another technique to create object is called static factory method. Static factory method is different than design pattern factory method. Class can provide a public static factory method, simply static method that returns an instance of class.

Dependency Injection

Introduction

Spring;

• Application development framework for java.
• Most popular application development framework.
• Makes developers more productive.
• Makes java simple productive, safer, reactive and cloud ready.

Dependency is more specific directly relationship among two object, where one of the object modification may require others may need to be modificated.

Read Software Architecture Patterns by Mark Richards
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