Java类信息作为函数参数

import java.lang.reflect.InvocationTargetException;interface IA{　　void fun();}

class C implements IA{　　public void fun() {

　　　　System.out.println(\"fun in C\");　　}}

class D implements IA{　　public void fun() {

　　　　System.out.println(\"fun in D\");　　}}

class B{

　　public void fun(Class ia) throws InstantiationException, IllegalAccessException, IllegalArgumentException,InvocationTargetException, 　　　　NoSuchMethodException, SecurityException {　　　　System.out.println(ia.getName());

　　　　IA exp=(IA) ia.getDeclaredConstructor().newInstance(); //根据反射机制实例化　　　　exp.fun(); //多态　　}}

public class test {

　　public static void main(String[] args) throws InstantiationException, IllegalAccessException, IllegalArgumentException,InvocationTargetException, NoSuchMethodException, SecurityException {　　　　B myB=new B();　　　　myB.fun(D.class);

　　　　System.out.println(\"normal running.\");　　}}