![]() ![]() Strategies/PayByPayPal.java: Payment via PayPal package refactoring_ strategies strategies/PayStrategy.java: Common interface of payment methods package refactoring_ After selecting a product to purchase, a customer picks a payment method: either Paypal or credit card.Ĭoncrete strategies not only perform the actual payment but also alter the behavior of the checkout form, providing appropriate fields to record payment details. In this example, the Strategy pattern is used to implement the various payment methods in an e-commerce application. Identification: Strategy pattern can be recognized by a method that lets a nested object do the actual work, as well as a setter that allows replacing that object with a different one. ![]() : service() method, plus all of the doXXX() methods that accept HttpServletRequest and HttpServletResponse objects as arguments. #compare() called from Collections#sort(). Here some examples of Strategy in core Java libraries: Java 8 brought the support of lambda functions, which can serve as simpler alternatives to the Strategy pattern. It’s often used in various frameworks to provide users a way to change the behavior of a class without extending it. Usage examples: The Strategy pattern is very common in Java code.
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