An in-depth explanation of java design patterns - static proxy

/**
 * 定义通用接口
 * @author Administrator
 * @date 2018/7/22
 */
public interface IBusiness {

    /**
     * 接口执行方法
     */
    void execute();
}

/**
 * 真实操作实现类
 * @author Administrator
 * @date 2018/7/22
 */
public class BusinessImpl implements IBusiness{

    @Override
    public void execute() {
        System.out.println("真正执行操作......");
    }
    
}

/**
 * 静态代理
 * @author Administrator
 * @date 2018/7/22
 */
public class ProxyBusiness implements IBusiness{

    /**
     * 定义需要执行的接口
     */
    private IBusiness business;

    /**
     * 通过set方法传参，真实需要执行的对象
     */
    public void setBusiness(IBusiness business) {
        this.business = business;
    }

    /**
     * 代理对象执行操作
     */
    @Override
    public void execute() {
        if(business == null){
            System.out.println("实际操作对象为null");
            return;
        }
        before();
        business.execute();
        after();
    }

    /**
     * 执行操作前
     */
    public void before(){
        System.out.println("执行操作前......");
    }

    /**
     * 执行操作后
     */
    public void after(){
        System.out.println("执行操作后......");
    }

    /**
     * 测试
     */
    public static void main(String[] args) {
        ProxyBusiness proxyBusiness = new ProxyBusiness();
        BusinessImpl business = new BusinessImpl();
        proxyBusiness.setBusiness(business);
        proxyBusiness.execute();
    }
}