读《深入理解Java虚拟机》第三版，周志明著。
import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; /** * @author hyl * @version v1.0: DynamicProxyTest.java, v 0.1 2020/9/3 19:45 $ */ public class DynamicProxyTest { interface IHello { void sayHello(); } static class Hello implements IHello { @Override public void sayHello() { System.out.println("hello world"); } } static class DynamicProxy implements InvocationHandler { Object originalObject; Object bind(Object originalObj) { this.originalObject = originalObj; return Proxy.newProxyInstance(originalObj.getClass() .getClassLoader(), originalObj.getClass() .getInterfaces(), this); } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("welcome"); return method.invoke(originalObject, args); } } public static void main(String[] args) { // 打印出代理类 System.getProperties().put("sun.misc.ProxyGenerator.saveGeneratedFiles","true"); IHello hello =(IHello) new DynamicProxy().bind(new Hello()); hello.sayHello(); } }