Java / Design Patterns
Explain strategy design pattern in Java.
Strategy pattern is useful for implementing set of related algorithms for example, compression algorithms, filtering strategies etc. Strategy design pattern allows you to create Context classes, that uses Strategy implementation classes for applying business rules. This pattern follows open closed design principle and quite useful in Java.
One example of Strategy pattern from JDK is a Collections.sort() method and Comparator interface, which is a strategy interface and defines strategy for comparing objects. Because of this pattern, we don't need to modify sort() method (closed for modification) to compare any object, at same time we can implement Comparator interface to define new comparing strategy (open for extension).
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