1 package DynamicProxy; 2  3 import java.lang.reflect.InvocationHandler; 4 import java.lang.reflect.Method; 5 import java.lang.reflect.Proxy; 6  7 interface AbstractClass { 8     public void show(); 9 }10 11 class ClassA implements AbstractClass {12     public void show() {13         System.out.println("I am A !");14     }15 }16 17 class ClassB implements AbstractClass {18     public void show() {19         System.out.println("I am B !");20     }21 }22 23 class Invoker implements InvocationHandler {24     AbstractClass ac;25     public Invoker(AbstractClass ac) {26         this.ac = ac;27     }28     29     @Override30     public Object invoke(Object proxy, Method method, Object[] args)31             throws Throwable {32         method.invoke(ac, args);33         return null;34     }35     36 }37 38 public class DynamicProxyTest {39     public static void main(String[] args) {40         41         Invoker invoker1 = new Invoker(new ClassA());42         AbstractClass ac1 = (AbstractClass) Proxy.newProxyInstance(AbstractClass.class.getClassLoader(), new Class[] {AbstractClass.class}, invoker1);43         ac1.show();44         45         Invoker invoker2 = new Invoker(new ClassB());46         AbstractClass ac2 = (AbstractClass) Proxy.newProxyInstance(AbstractClass.class.getClassLoader(), new Class[] {AbstractClass.class}, invoker2);47         ac2.show();48     }49 }