Java Coding Problems

Implementing a dynamic proxy

For example, let's write a dynamic proxy that counts the number of invocations of the methods of List.

A dynamic proxy is created via the Proxy.newProxyInstance() method. The newProxyInstance() methods takes three parameters:

• ClassLoader: This is used to load the dynamic proxy class
• Class<?>[]: This is the array of interfaces to implement
• InvocationHandler: This is the invocation handler to dispatch method invocations to

Check out this example:

List<String> listProxy = (List<String>) Proxy.newProxyInstance(  List.class.getClassLoader(), new Class[] {    List.class}, invocationHandler);

This snippet of code returns a dynamic implementation of the List interface. Further, all invocations via this proxy will be dispatched ...