关于创建动态类的实例对象及调用其方法 - 黑马程序员技术交流社区

package cn.itcast.day3;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Collection;
public class ProxyTest {
/**
* @param args
*/
public static void main(String[] args)throws Exception {
// TODO Auto-generated method stub
Class clazzProxy1 = Proxy.getProxyClass(Collection.class.getClassLoader(), Collection.class);
System.out.println(clazzProxy1.getName());
System.out.println("------begin constructors list------");
/*$Proxy0()
$Proxy0(InvocationHandler,int)*/
Constructor[] constructors = clazzProxy1.getConstructors();
for(Constructor constructor : constructors){
String name = constructor.getName();
StringBuilder sBuilder = new StringBuilder(name);
sBuilder.append('(');
Class[] clazzParams = constructor.getParameterTypes();
for(Class clazzParam : clazzParams){
sBuilder.append(clazzParam.getName()).append(',');
}
if(clazzParams!=null && clazzParams.length != 0)
sBuilder.deleteCharAt(sBuilder.length()-1);
sBuilder.append(')');
System.out.println(sBuilder.toString());
}
System.out.println("------begin methods list------");
/*$Proxy0()
$Proxy0(InvocationHandler,int)*/
Method[] methods = clazzProxy1.getMethods();
for(Method method : methods){
String name = method.getName();
StringBuilder sBuilder = new StringBuilder(name);
sBuilder.append('(');
Class[] clazzParams = method.getParameterTypes();
for(Class clazzParam : clazzParams){
sBuilder.append(clazzParam.getName()).append(',');
}
if(clazzParams!=null && clazzParams.length != 0)
sBuilder.deleteCharAt(sBuilder.length()-1);
sBuilder.append(')');
System.out.println(sBuilder.toString());
}
System.out.println("------begin create instance object------");
//Object obj = clazzProxy1.newInstance();
Constructor constructor = clazzProxy1.getConstructor(InvocationHandler.class);
class MyInvocationHandler1 implements InvocationHandler {
@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
// TODO Auto-generated method stub
return null;
}
Collection proxy1 = (Collection)constructor.newInstance(new MyInvocationHandler1());//
System.out.println(proxy1);
}
}
}

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