How to use the proxy design pattern in the java interface

This article focuses on "how to use the agent design pattern in the java interface". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use the agent design pattern in the java interface.

Concept: two subclasses work together to implement an interface, one of which is responsible for the real business implementation, and the other is responsible for assisting the real business theme.

Package www.miao.java;interface ISubject {/ / the core function is to buy a computer public void buyComputer ();} / real business implementation class RealSubject implements ISubject {public void buyComputer () {System.out.println ("buy an alien computer");}} class proxySubject implements ISubject {/ / real operation business private ISubject subject; public proxySubject (ISubject subject) {this.subject = subject;} public void produceComputer () {System.out.println ("production of alien computers") } public void afterSale () {System.out.println ("after-sale of alien computers");} public void buyComputer () {/ / prepare this.produceComputer () before real operation; / / call real business this.subject.buyComputer (); / / wrap up this.afterSale () after operation;}} class Factory {public static ISubject getInstance () {return new proxySubject (new RealSubject ()) }} public class Test {public static void main (String [] args) {ISubject subject = Factory.getInstance (); subject.buyComputer ();}}

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