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                ## **模式的定義** 定義了一組算法,將每個算法都封裝起來,并且使它們之間可以互換。 舉個傳銷的栗子,傳銷體系結算中,一級代理、二級代理、三級代理等等都有他們對應等級的結算算法,那我們就可以利用策略模式封裝每級代理的結算算法,并提供統一的結算方法,只要輸入代理等級就可以輸出對應的結算金額。 ## **代碼實現** 1. 定義標準結算算法策略并實現各個級別的結算策略 ``` // 定義抽象算法策略 public abstract class Strategy { // 結算 abstract void settle(); } // 實現一級代理結算策略 public class Level1Strategy extends Strategy{ @Override void settle() { System.out.println("一級代理結算"); } } // 實現二級代理結算策略 public class Level2Strategy extends Strategy{ @Override void settle() { System.out.println("二級代理結算"); } } ``` 2. 創建對外調用的結算實例 ``` public class SettleContext { private Strategy strategy; public SettleContext(Strategy strategy) { this.strategy = strategy; } // 執行 public void execute() { strategy.settle(); } } ``` 3. 客戶端調用 ``` public static void main(String[] args) { SettleContext context1 = new SettleContext(new Level1Strategy()); context1.execute(); SettleContext context2 = new SettleContext(new Level2Strategy()); context2.execute(); } ```
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