Drools Rule Engine

Overview Drools Rule Engine is a Business Rules Management System (BRMS) solution. Some people also consider drool as a Business Logic integration Platform (BLiP). It provides the following features. Core Business Rules Engine (BRE), Drools Workbench (A rule authoring web application) Support for Decision Model and Notation (DMN)  Eclipse IDE plugin for core development. Drools has…

Facade Design Pattern

The facade design pattern is a structural design pattern used commonly in object oriented languages like Java. A facade is an object that serves as a front-facing interface masking more complex underlying or structural code. the facade design pattern can: improve the readability and usability by masking interaction with more complex components behind a simplified API. provide a context-specific…

Decorator Design Pattern

Decorator Design pattern allows us to add behaviour to an object without affecting the other objects of the same class. When to use the decorator pattern If you want an object to gain (or lose) functionality at runtime, then you should use the decorator pattern. This approach lets us add features to a class without…

Composite Design Pattern

The composite design pattern is a partitioning design pattern. It lets you treat a group of objects the same way you would treat a single object of that kind. In this post, we will try to explore this with an example in Java. For example, A large arithmetic expression is a composite of smaller expressions….

Bridge Design Pattern

The Bridge design pattern is a structural pattern that deals with decoupling abstraction and its implementation. It lets you split a set of related classes into two separate abstraction and implementation hierarchies. As these are now separated, you can develop them independently of each other. Let’s understand this design pattern with an example in Java….

Adapter Design Pattern

Let’s learn about Adapter Design Pattern with an example in Java. What is Adapter Design Pattern? the adapter pattern bridges the gap between two incompatible classes or interface. It is one of the structural design patterns described in the Book of Gang of Four. For example, take a look at the analogy of android and…

Prototype Design Pattern

In this post, We will take a look at prototype design pattern in java with an example. What is Prototype Pattern? The prototype Design pattern is a creational pattern that deals with creating objects quickly through cloning. This pattern is helpful when an object would take less time to initialize than through constructors. Also, this…

Builder Design Pattern

In this post, We will take a look at Builder Design Pattern in Java with a real-world example. It is a creational design pattern that allows to create objects with variations. Definition As per the book from the gang of four on design patterns, The builder design pattern separates the construction of a complex object…

Singleton Design Pattern

The Singleton Design Pattern in java restricts the instantiation of a class to a “single” object. It is a creational pattern as it deals with object creation. Also, this pattern is the simplest among all design patterns. A java class is following singleton pattern if the following statements are true. The class must have only one…

Abstract Design Pattern

Let’s take a look at the abstract factory design pattern in java with a real-world example. Abstract factory pattern in java is a creational pattern. It is based on factory pattern but goes one level deep to create the factory of factories. This pattern deals with similar factories by grouping them. In abstract factory pattern,…