import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public class LogHandler implements InvocationHandler {     private Object delegate;     public Object bind(Object delegate) {         this.delegate = delegate;         return Proxy.newProxyInstance(delegate.getClass().getClassLoader(),                 delegate.getClass().getInterfaces(), this);     }     @Override     public Object invoke(Object proxy, Method method, Object[] args)             throws Throwable {         Object result = null;         try {             System.out.println("方法开始：" + method);             result = method.invoke(delegate, args);             System.out.println("方法结束：" + method);         } catch (Exception e) {             e.printStackTrace();         }         return result;     } }

public interface Animal {     public void hello(); }

public class Monkey implements Animal {     @Override     public void hello() {         // TODO Auto-generated method stub         System.out.println("hello");     } }

public class Main {     public static void main(String[] args) {         LogHandler logHandler = new LogHandler();         Animal animal = (Animal) logHandler.bind(new Monkey());         animal.hello();     } }