动态代理JDK

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class MyProxy implements InvocationHandler {
    public void setTarget(Car target) {
        this.target = target;
    }

    private Car target;

    public Object getProxy(){
       return  Proxy.newProxyInstance(target.getClass().getClassLoader(),target.getClass().getInterfaces(),this);
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("代理");
        return method.invoke(target,args);
    }

    public static void main(String[] args) {

        Car car = new Car();
        MyProxy myProxy = new MyProxy();
        myProxy.setTarget(car);
        Vehical proxy = (Vehical) myProxy.getProxy();
        proxy.getCar();

    }

    static class Car implements Vehical {
       @Override
       public void getCar(){
           System.out.println("haha");
        }
    }

    interface Vehical {
        void getCar();
    }
}