package typeinfo;

import java.lang.reflect.*;

/**

* RUN:

* javac typeinfo/SelectingMethods.java && java typeinfo.SelectingMethods

* OUTPUT:

* boring1

* boring2

* Proxy detected interesting method!

* interesting bonobo

* boring3

*/

public class SelectingMethods {

public static void main(String[] args) {

SomeMethods proxy = (SomeMethods)Proxy.newProxyInstance(

SomeMethods.class.getClassLoader()

, new Class[]{ SomeMethods.class }

, new MethodSelector(new Implementation())

);

proxy.boring1();

proxy.boring2();

proxy.interesting("bonobo");

proxy.boring3();

}

}

class MethodSelector implements InvocationHandler {

private Object proxied;

public MethodSelector(Object proxied) {

this.proxied = proxied;

}

public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

if (method.getName().equals("interesting")) {

System.out.println("Proxy detected interesting method!");

}

return method.invoke(proxied, args);

}

}

interface SomeMethods {

void boring1();

void boring2();

void boring3();

void interesting(String arg);

}

class Implementation implements SomeMethods {

public void boring1() { System.out.println("boring1"); }

public void boring2() { System.out.println("boring2"); }

public void boring3() { System.out.println("boring3"); }

public void interesting(String arg) { System.out.println("interesting " + arg); }

}