InvocationHandler

An InvocationHandler is an interface in Java that is implemented by a dynamic proxy class. It is used to handle method invocations on the proxy object.

The InvocationHandler interface has a single method called "invoke", which is called when a method is invoked on the proxy object. This method takes three parameters: the proxy object itself, the method being invoked, and an array of objects representing the arguments passed to the method.

The implementation of the invoke method in the InvocationHandler is responsible for handling the method invocation. It can perform any necessary actions before or after the method call, modify the arguments or return value, and even delegate the method call to another object.

InvocationHandler is often used in combination with the Proxy class in Java to create dynamic proxy objects. These proxy objects can intercept method invocations and perform additional operations, such as logging, caching, or security checks, before or after the actual method call.

Overall, the InvocationHandler interface provides a powerful mechanism for intercepting and handling method invocations on proxy objects in Java. It allows for dynamic behavior and can be used in a wide range of scenarios, such as implementing AOP (Aspect-Oriented Programming) or creating custom frameworks and libraries