Chain of Responsibility Pattern in Java

Chain of Responsibility Pattern is a Behavioral Pattern in which, a Request is sent through a chain of handling Objects without knowing which Object will handle it. With Chain of Responsibility Pattern, we can avoid coupling the Sender of a request to received Objects and create a processing sequence automatically based on type of request.

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Observer Pattern in Java

Observer Pattern is a Behavioral Pattern in which, an Object (we call it Subject) contains a list of dependency Objects (we call them Observers). Observers will be notified and updated automatically whenever Subject changes its state. Today we’re gonna look at how Observer Pattern in Java works.

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Java Design Pattern – Abstract Factory Pattern

Abstract factory pattern is a Super-Factory of a group familiar factories. We can use it to expose API for integration code and hidden the logic implementation. Abstract Factory gives us a way to manage and decouple design in case Program has more than one Factory having the same Interface.

The tutorial will guide you a sample for how to program with Abstract Factory Pattern.

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Java Design Pattern – Singleton Pattern

Singleton Pattern is a design pattern which you often meet in almost applications. Singleton Pattern provides a way to instantiate only one instance in an application context.

The tutorial introduces the design of Singleton Design Pattern and give many ways to create a Singleton Pattern in your application.

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