策略模式的思想的经典案例分析

我们先来假设一个场景：作为杂货店老板，你还需要根据不同季节或促销活动选择不同的定价策略。比如在淡季时，货物打9折销售。大批量采购时，提供85折优惠。

实际上，这就是策略模式的思想。

// 定义策略接口 interface PricingStrategy { double calculatePrice(double originalPrice); } // 定义具体策略 class SeasonalDiscountStrategy implements PricingStrategy { @Override public double calculatePrice(double originalPrice) { return originalPrice * 0.9; // 10% discount } } class BulkPurchaseDiscountStrategy implements PricingStrategy { @Override public double calculatePrice(double originalPrice) { return originalPrice * 0.85; // 15% discount } } // 上下文 class GroceryStore { private PricingStrategy pricingStrategy; public GroceryStore(PricingStrategy strategy) { this.pricingStrategy = strategy; } public double calculateFinalPrice(double originalPrice) { return pricingStrategy.calculatePrice(originalPrice); } } // 使用示例 public class Main { public static void main(String[] args) { PricingStrategy seasonalDiscount = new SeasonalDiscountStrategy(); PricingStrategy bulkPurchaseDiscount = new BulkPurchaseDiscountStrategy(); GroceryStore store = new GroceryStore(seasonalDiscount); double finalPrice = store.calculateFinalPrice(100.0); System.out.println("Final price with seasonal discount: " + finalPrice); store = new GroceryStore(bulkPurchaseDiscount); finalPrice = store.calculateFinalPrice(10000.0); System.out.println("Final price with bulk purchase discount: " + finalPrice); } }

运行程序，输出如下：

Final price with seasonal discount: 90.0 Final price with bulk purchase discount: 8500.0

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