Prototype Design Pattern Program in Java

Published: 10 April 2018
on channel: Programming Line

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******************** Prototype Design Pattern:
→ It falls under Creational Design Pattern.
→ Book definition: "Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype."
→ Simple definition: "Create new objects by copying or cloning the existing object."

When to use Prototype Design Pattern?
→ When the object creation is a costly operation.
→ Example: An Object is to be created after reading data from a database. Reading data from the database is a costly operation.

Sample Implementation:
→ It consists of a base class "Shape" and two derived classes called "Square" and "Rectangle".
→ We are trying to maintain a map that would cache the "Square" and "Rectangle" object.
→ If a new request is to create a new "Square" or "Rectangle" object then it will check the cache map. If it exists then we would just clone the existing object and we will do the required operations on that.

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