Design pattern-Agent pattern

Agent mode: the agent and the principal realize the common behavior, and then let the agent system call the principal to complete these behaviors.

Example: the agent Proxy acts on behalf of MrLi to send gifts to MrssHong.

The class diagram is as follows:

Code implementation:

Define an interface for giving gifts: GiveGift

Package com.zpj.designMode.proxy;// defines an interface for giving gifts: public interface GiveGift {public void giveFlowers (); public void giveDolls (); public void giveChocolate ();}

Implement MrLi:

Package com.zpj.designMode.proxy;/** * MrLi will chase girls to give gifts, so to implement the interface GiveGift * / public class MrLi implements GiveGift {private MrssHong hong;// is pursued by public MrLi (MrssHong hong) {this.hong = hong;} @ Override public void giveFlowers () {System.out.println ("- send flowers -" + hong.getName ()) } @ Override public void giveDolls () {System.out.println ("- send dolls -" + hong.getName ();} @ Override public void giveChocolate () {System.out.println ("- send chocolates -" + hong.getName ());}}

Implement the proxy Proxy:

Package com.zpj.designMode.proxy;public class Proxy implements GiveGift {private MrLi person;// principal public Proxy (MrssHong hong) {person = new MrLi (hong);} @ Override public void giveFlowers () {person.giveFlowers ();} @ Override public void giveDolls () {person.giveDolls ();} @ Override public void giveChocolate () {person.giveChocolate ();}

Gift recipient: MrssHong

Package com.zpj.designMode.proxy;public class MrssHong {private String name; public MrssHong (String name) {super (); this.name = name;} public String getName () {return name;} public void setName (String name) {this.name = name;}}

Test class:

Package com.zpj.designMode.proxy;import org.junit.Test;public class TestUnit {@ Test public void test01 () {MrssHong hong = new MrssHong ("Red × × ×"); / / tell the agent who to send the gift, this agent belongs exclusively to MrLi Proxy proxy = new Proxy (hong); / / the agent sends the gift proxy.giveFlowers (); proxy.giveChocolate (); proxy.giveDolls () }}