How to Make a Proxy in Java

Proxy classes in Java represent classes that handle method calls for other classes. Essentially, this means that when two classes inherit methods from a base interface, one class will implement the interface method by calling the method of the other class. Thus, one class can call the method of another while shielding users from the fact that another class exists. This can enhance class and data security by controlling how users interact with objects and data.

Things You'll Need

• Java Development Kit

Instructions

1. Create a generic interface that contains an abstract method. For example:

   interface ProxyInterface{
   public void method();
   }

2. Create two classes that implement the ProxyInterface:

   class P1 implements ProxyInterface{
   }

   class P2 implements ProxyInterface{
   }

3. Create an implementation of "method()" in class "P2." Then, call the P2 version of "method()" from "P1." P1 now represents the proxy class:

   class P1 implements ProxyInterface{

   P2 p = new P2();

   public void method(){
   p.method();
   }

   class P2 implements ProxyInterface{

   public void method(){
   System.out.println("Hi");
   }

   }

References

• Java World: Explore the Dynamic Proxy API
• Devx: Using Proxy Classes in Java