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Answer Posted / encapsulation
(I) Can you explain strategy pattern?
Strategy pattern are algorithms inside a class which can be
interchanged depending on the class used. This pattern is
useful when you want to decide on runtime which algorithm
to be used.
Let's try to see an example of how strategy pattern works
practically. Let's take an example of a math's calculation
where we have strategies like add and substract.
Figure 'Strategy in action' shows the same in a pictorial
format. It takes two numbers and the depending on the
strategy it gives out results. So if it's an addition
strategy it will add the numbers, if it's a substraction
strategy it will give the substracted results. These
strategies are nothing but algorithms. Strategy pattern are
nothing but encapsulation of algorithms inside classes.
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