What are some examples of the Strategy Pattern in Java?

Can you explain the Strategy Pattern in Java?

Sure! The Strategy Pattern is a behavioral design pattern that enables selecting an algorithm's behavior at runtime.

Can you give me a code example of the Strategy Pattern?

Absolutely! Here's a simple example:

// Strategy Interface
interface PaymentStrategy {
    void pay(int amount);
}

// Concrete Strategy A
class CreditCardPayment implements PaymentStrategy {
    public void pay(int amount) {
        System.out.println("Paid " + amount + " using Credit Card.");
    }
}

// Concrete Strategy B
class PayPalPayment implements PaymentStrategy {
    public void pay(int amount) {
        System.out.println("Paid " + amount + " using PayPal.");
    }
}

// Context
class ShoppingCart {
    private PaymentStrategy paymentStrategy;

    public void setPaymentStrategy(PaymentStrategy paymentStrategy) {
        this.paymentStrategy = paymentStrategy;
    }

    public void checkout(int amount) {
        paymentStrategy.pay(amount);
    }
}

In this example, you can switch between different payment strategies at runtime.

What are the benefits of using the Strategy Pattern?

The Strategy Pattern promotes flexibility and reusability. It allows you to define a family of algorithms, encapsulate each one, and make them interchangeable. This means you can change the algorithm used without altering the code that uses it.