修改if-else到策略模式

// 定义策略接口
interface Strategy {
    void execute();
}

// 具体策略类A
class ConcreteStrategyA implements Strategy {
    public void execute() {
        // 实现具体的策略A
    }
}

// 具体策略类B
class ConcreteStrategyB implements Strategy {
    public void execute() {
        // 实现具体的策略B
    }
}

// 上下文类
class Context {
    private Strategy strategy;

    public Context(Strategy strategy) {
        this.strategy = strategy;
    }

    public void executeStrategy() {
        strategy.execute();
    }
}

// 使用策略模式
public class Main {
    public static void main(String[] args) {
        // 根据条件选择策略类
        Strategy strategy;
        if (condition) {
            strategy = new ConcreteStrategyA();
        } else {
            strategy = new ConcreteStrategyB();
        }

        // 创建上下文对象，并传入策略类
        Context context = new Context(strategy);

        // 执行策略
        context.executeStrategy();
    }
}