java_代理模式_静态代理

public interface IHello {
    String hi(String key);
}


public class HelloStaticProxy implements IHello{
    private IHello iHello;

    public HelloStaticProxy(IHello iHello) {
        this.iHello = iHello;
    }

    @Override
    public String hi(String key) {
        System.out.println(">>>>>start proxy start");
        String result = iHello.hi(key);
        System.out.println(">>>>>static proxy end");
        return result;
    }

}


public class HelloImpl1 implements IHello{
    @Override
    public String hi(String key) {
        String str = "hello:" + key;
        System.out.println("HelloImpl1! " + str);
        return str;
    }
}


public class HelloImpl2 implements IHello{
    @Override
    public String hi(String key) {
        String str = "hello:" + key;
        System.out.println("HelloImpl2! " + str);
        return str;
    }
}



public class DemoTest {
    public static void main(String[] args) {
        IHello helloProxy = new HelloStaticProxy(new HelloImpl1());
        helloProxy.hi("world");
        helloProxy = new HelloStaticProxy(new HelloImpl2());
        helloProxy.hi("world");
    }
}