面试题Android面试一问一答

Android面试一问一答:代理模式

2019-01-12  本文已影响17人  LvStudio

什么是代理模式,代理模式有哪几种

静态代理和动态代理有什么区别

代码实现

public interface IShopPhone {
    /**
     * 购买手机
     * @param phoneName 手机型号
     */
    void shopPhone(String phoneName);
}

public class ZeroShopPhone implements IShopPhone {
    @Override
    public void shopPhone(String phoneName) {
        System.out.println("Zero 成功购买: "+phoneName+" 手机");
    }
}

public class ProxyShopPhone implements IShopPhone {

    private ZeroShopPhone shopPhone;

    public ProxyShopPhone(ZeroShopPhone shopPhone) {
        super();
        this.shopPhone = shopPhone;
    }

    @Override
    public void shopPhone(String phoneName) {
        System.out.println("我是代理商,我悄悄的拿走一个摄像头 →_→!");
        this.shopPhone.shopPhone(phoneName);
    }
}

public class Client {
    public static void main(String[] args) {
        IShopPhone zeroShopPhone = new ZeroShopPhone();
        IShopPhone proxy = new ProxyShopPhone(zeroShopPhone);
        proxy.shopPhone("IPhone X");
    }
}
public class Client {
    public static void main(String[] args) {
        IShopPhone zeroShopPhone = new ZeroShopPhone();

        IShopPhone proxy = (IShopPhone) Proxy.newProxyInstance(
                zeroShopPhone.getClass().getClassLoader(),
                zeroShopPhone.getClass().getInterfaces(), 
                new InvocationHandler() {
                    @Override
                    public Object invoke(Object obj, Method method, Object[] args) throws Throwable {
                        System.out.println("我是代理商,我悄悄的拿走一个摄像头 →_→!");
                        return method.invoke(zeroShopPhone, args);
                    }
                });
        proxy.shopPhone("IPhone X");
    }
}

参考:https://www.jianshu.com/p/ebf55553bfe6
参考:https://www.jianshu.com/p/148940451575

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