Abstract Factory pattern works around a super-factory which creates other factories. This factory is also called as a factory of factories. Abstract Factory design pattern comes under Creational Design Pattern as this pattern provides one of the best ways to create Objects. In Abstract Factory pattern an interface is responsible for creating a fact...

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Let us learn another creational design pattern in this article. Prototype design pattern implementation allows us to solve the problem of having multiple copies of objects those are expensive and resource intensive to create. Gang of Four book defines prototype design pattern as below Specifies kind of objects to created using prototypical instance...

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The Chain of Responsibility (COR) design pattern is used when more than one object handles a request and performs their corresponding responsibilities to complete the whole task. The pattern can be used to achieve loose coupling in software design, where the request can be passed through a chain of objects or request handler for processing. Based o...

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This pattern is used when some objects (observer) are dependent upon the state of another object (observable). The pattern is defined by GoF as: Define a one-to-many dependency between objects so that when one object changes state, all its dependent are notified and updated automatically. The object which is being watched is called the Subject and ...

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Facade pattern is one of the most frequently used Structural design pattern. GoF defined this pattern as: Provide a unified interface to a set of interfaces in a subsystem. Facade Pattern defines a higher-level interface that makes the subsystem easier to use. “beep beep.. Msg received… salary credited to ur a/c” Without any 2nd thought we can acce...

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The Flyweight Pattern can be a useful pattern in situations where we have several objects, and many of those are representing the same value. In these instances, it can be possible to share the values as long as the objects are immutable. The following example shows from the Java standard library, taken from Sun’s implementation of the Integer clas...

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Flyweight Design Pattern is one of the Structural design pattern. This pattern decreases object count in heap by reusing Objects from an Object pool. This will improve application’s memory management. According to GoF, flyweight design pattern’s intent is: Use sharing to support large numbers of fine-grained objects efficiently. Flyweight design pa...

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Strategy pattern is one of the behavioural design patterns. This pattern is to be used where you want to choose the algorithm to use at runtime. Is intended to provide a means to define a family of algorithms, encapsulate each one as an object. These can then be flexibly passed in to change the functionality and let the client decides the actual im...

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