java动态代理解决方案

package blog.dynamicProxy;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;public class JDynamicProxy {    public static void main(String[] args) {        RealSubject real=new RealSubject();        Subject sub=(Subject)java.lang.reflect.Proxy.newProxyInstance(Subject.class.getClassLoader(), new Class[]{Subject.class}, new DynamicProxy(real));        sub.performance(10000);        sub.performance(90000);    }}interface Subject{    public void performance(int n);}class RealSubject implements Subject{    @Override    public void performance(int n) {        String str=null;        for(int i=0;i<n;++i){            str+=String.valueOf(i);        }    }}class DynamicProxy implements InvocationHandler{    protected Object proxied;    public DynamicProxy(Object o){        this.proxied=o;    }    @Override    public Object invoke(Object proxy, Method method, Object[] args)            throws Throwable {        long before=System.currentTimeMillis();        method.invoke(proxied, args);        long time=System.currentTimeMillis()-before;        System.out.println(time);        return null;    }    }