Java 接口方法调用的代理模式

// 接口
interface Subject {
    void doSomething();
}

// 实际类
class RealSubject implements Subject {
    @Override
    public void doSomething() {
        System.out.println("RealSubject: Doing something...");
    }
}

// 代理类
class Proxy implements Subject {
    private Subject realSubject;

    public Proxy(Subject realSubject) {
        this.realSubject = realSubject;
    }

    @Override
    public void doSomething() {
        // 在调用实际方法之前或之后可以进行额外处理
        System.out.println("Proxy: Before calling realSubject...");
        realSubject.doSomething();
        System.out.println("Proxy: After calling realSubject...");
    }
}

// 实战案例
public class Main {
    public static void main(String[] args) {
        // 创建实际类
        Subject realSubject = new RealSubject();

        // 创建代理类
        Subject proxy = new Proxy(realSubject);

        // 通过代理类调用接口方法
        proxy.doSomething();
    }
}