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When should Visitor Pattern be used?
The visitor pattern is useful when you want to process a data structure containing different kinds of objects, and you want to perform a specific operation on each of them, depending on its type. Your example is not the best, since you pass a single homogeneous list as input, so there is really no need for the pattern.
Which design pattern ensures that only one object of particular class gets created?
Which design pattern ensures that only one object of particular class gets created? Explanation: Singleton pattern involves a single class which is responsible to create an object while making sure that only one object gets created.
When would you use the Flyweight pattern?
The flyweight pattern is useful when dealing with large numbers of objects with simple repeated elements that would use a large amount of memory if individually stored. It is common to hold shared data in external data structures and pass it to the objects temporarily when they are used.
When do you use the visitor design pattern?
Visitor design pattern. Visitor design pattern is one of the behavioral design patterns. It is used when we have to perform an operation on a group of similar kind of Objects. With the help of visitor pattern, we can move the operational logic from the objects to another class.
How is concretevisitor used in abstract visitor pattern?
ConcreteVisitor : For each type of visitor all the visit methods, declared in abstract visitor, must be implemented. Each Visitor will be responsible for different operations. Visitable : This is an interface which declares the accept operation. This is the entry point which enables an object to be “visited” by the visitor object.
Which is the entry point for the visitor object?
This is the entry point which enables an object to be “visited” by the visitor object. ConcreteVisitable : These classes implement the Visitable interface or class and defines the accept operation.