java动态代理简单实例

package hello;

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


interface AbstractClass {
	public void show();
}

class ClassA implements AbstractClass {
	public void show() {
		System.out.println("我是A类");
	}
}

// 具体类B  
class ClassB implements AbstractClass {  
    public void show() {  
        // TODO Auto-generated method stub  
        System.out.println("我是B类！");  
    }  
}  

class Invoker implements InvocationHandler {
	AbstractClass ac;
	public Invoker(AbstractClass ac) {
		this.ac = ac;
	}
	
	public Object invoke(Object proxy, Method method, Object[] arg) throws Throwable {
		method.invoke(ac, arg);
	    return null;
	}
}


// test
class HelloWorld {
	public static void main(String[] args) {
		Invoker invoker1 = new Invoker(new ClassA());
		AbstractClass ac1 = (AbstractClass) Proxy.newProxyInstance(AbstractClass.class.getClassLoader(), new Class[]{AbstractClass.class},invoker1);
		ac1.show();
		Invoker invoker2 = new Invoker(new ClassA());
		AbstractClass ac2 = (AbstractClass) Proxy.newProxyInstance(AbstractClass.class.getClassLoader(), new Class[]{AbstractClass.class},invoker2);
		ac2.show();		
}
}

1. 我是A类！  
2. 我是B类！