Using drools to solve the problem of Xiao Ming drinking soda

Problem Description:

1, Xiao Ming Hand has 50 yuan money;

2, 1 yuan money can buy a bottle of drink;

3, 2 empty bottles can be exchanged for a bottle of drink;

4. The question is: how many bottles of drink can Xiao Ming drink at last?

First, create a new MAVEN project and join the drools dependency

<dependency><groupId>org.drools</groupId><artifactId>drools-core</artifactId> <version>6.2.0.final</version></dependency><dependency><groupid>org.drools</ groupid><artifactid>drools-compiler</artifactid><version>6.2.0.final</version></ Dependency>

Package Com.lala.bean;public class Drinks {private integer money;private integer total = 0;//drink quantity private integer bottle = 0; Number of empty bottles public drinks (Integer money) {This.money = money;} Public Integer Getmoney () {return money;} public void Setmoney ("Integer money") {This.money = money;} Public Integer Gettotal () {return total;} public void Settotal (Integer total) {this.total = total;} Public Integer Getbottle () {return bottle;} public void Setbottle (Integer bottle) {this.bottle = bottle;}}

Drools Rules:

Package Com.drink;import com.lala.bean.drinks;rule ' Money ' salience 2    when    $d:D rinks (Money > 0);    Then    Modify ($d) {    Setmoney ($d. Getmoney ()-1),//buy a bottle of    settotal ($d. Gettotal () + 1),//drink a bottle of    Setbottle ($ D.getbottle () + 1);//Add an empty bottle (add an empty bottle for each bottle)    };endrule "Bottle" Salience 1 when    $d:D rinks (bottle >= 2);    Then    Modify ($d) {    setbottle ($d. Getbottle ()-2),//2 empty bottles for a bottle of    settotal ($d. Gettotal () + 1),//Drink a bottle    Setbottle ($d. Getbottle () + 1);//Add an empty bottle (add an empty bottle for each bottle)    };end

Test:

Package Com.lala.mydrools;import Org.kie.api.kieservices;import Org.kie.api.runtime.kiecontainer;import Org.kie.api.runtime.kiesession;import Com.lala.bean.drinks;public class Test {static Kiesession getsession ()    {        kieservices ks = KieServices.Factory.get ();                 Kiecontainer KC = Ks.getkieclasspathcontainer ();         Return kc.newkiesession ("Simpleruleksession");    }    public static void Main (string[] args)    {        Kiesession ks = GetSession ();                Drinks dr = new Drinks (a);        Ks.insert (DR);        int count = Ks.fireallrules ();        SYSTEM.OUT.PRINTLN ("Always executed" +count+ "rule");        System.out.println ("Can drink in total:" + dr.gettotal () + "bottle");        Ks.dispose ();    }}

Finally, the output is:

There are 99 rules that have been executed.
Total Drink: 99 Bottles

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Using drools to solve the problem of Xiao Ming drinking soda