24种设计模式-代理

代理模式,：实际工作的类被隐藏在代理类的后面。当你调用代理类中的方法，实际上调用的是实体类中的方法

package design;

/**
 * Created by Administrator on 2018/4/19.
 */
public interface ProxyBase {
    void f();
    void g();
    void h();
}

package design;

/**
 * Created by Administrator on 2018/4/19.
 */
public class Proxy implements ProxyBase {
    private ProxyBase impelmentation;

    public Proxy(){
        impelmentation=new Implementation();
    }
    public void f() {
        impelmentation.f();
    }

    public void g() {
        impelmentation.g();
    }

    public void h() {
        impelmentation.h();
    }
}

class Implementation implements ProxyBase {
    public void f() {
        System.out.println("Implementation.f()");
    }

    public void g() {
        System.out.println("Implementation.g()");
    }

    public void h() {
        System.out.println("Implementation.h()");
    }

}

package design;

/**
 * Created by Administrator on 2018/4/19.
 */
public class ProxyDemo {
    Proxy p = new Proxy();
    public void test() {
// This just makes sure it will complete
// without throwing an exception.
        p.f();
        p.g();
        p.h();
    }
    public static void main(String args[]) {
        junit.textui.TestRunner.run(ProxyDemo.class);
    }
}