As we know design pattern are created to solve a specific problem. Singleton solve the problem of creating only one object of one class. Singleton design pattern is one of the most popular design patterns, it restricts any class to have only one object. And that object is used where ever required. There are certain…

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The Observer pattern is a software design pattern in which an object, called the subject, maintains a list of all the other objects that depend on it (the subject). These dependents are called observers. They are automatically notified if the state of the subject (the maintainer of all dependents(observers)) changes. It is usually accomplished by…

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