这种场景你还写 ifelse 你跟孩子坐一桌去吧

@Test
public void test_ifelse() {
    Result result = null;
    if ("男".equals(policy.getSex())) {
        if (policy.getAge() < 18) {
            if (policy.getUserSingle()) {
                result = Result.buildResult("A", "红色A");
            } else {
                result = Result.buildResult("B", "红色B");
            }
        } else if (policy.getAge() >= 18 && policy.getAge() <= 30) {
            if (policy.getUserMarry()) {
                result = Result.buildResult("C", "红色C");
            } else {
                result = Result.buildResult("D", "红色D");
            }
        } else if (policy.getAge() > 30) {
            if (policy.getUserParenting()) {
                result = Result.buildResult("E", "红色E");
            } else {
                result = Result.buildResult("F", "红色F");
            }
        }
    } else if ("女".equals(policy.getSex())) {
        if (policy.getAge() < 18) {
            if (policy.getUserSingle()) {
                result = Result.buildResult("A", "黄色A");
            } else {
                result = Result.buildResult("B", "黄色B");
            }
        } else if (policy.getAge() >= 18 && policy.getAge() <= 30) {
            if (policy.getUserMarry()) {
                result = Result.buildResult("C", "黄色C");
            } else {
                result = Result.buildResult("D", "黄色D");
            }
        } else if (policy.getAge() > 30) {
            if (policy.getUserParenting()) {
                result = Result.buildResult("E", "黄色E");
            } else {
                result = Result.buildResult("F", "黄色F");
            }
        }
    }
    System.out.println("决策结果(IfElse)：" + result);
}

itstack-demo-drools-02
└── src
    ├── main
    │   ├── java
    │   │   └── org.itstack.demo
    │   │       ├── model
    │   │       │	└── Policy.java
    │   │       └── Result.java
    │   ├── resources
    │   │   ├── META-INF
    │   │   │   └── kmodule.xml
    │   │   └── rules
    │   │       └── tree.drl
    │   └── webapp
    │       └── index.html
    └── test
         └── java
             └── org.itstack.demo.test
                 └── ApiTest.java

public class Policy {
    private String sex;            // 性别；男、女
    private Integer age;           // 年龄
    private Boolean userSingle;    // 单身；是/否
    private Boolean userMarry;     // 结婚；是/否
    private Boolean userParenting; // 育儿；是/否
    
    ...get/set
}    

public class Result {
    private String code;
    private String info;
    
}    

<?xml version="1.0" encoding="utf-8" ?>
<kmodule xmlns="http://www.drools.org/xsd/kmodule">
    <kbase name="rules">
        <ksession name="all-rules"/>
    </kbase>
</kmodule>

package rules;
import org.itstack.demo.model.Policy
import org.itstack.demo.Result;
global org.itstack.demo.Result res;
rule "红A"
when
    Policy(sex == "男", age < 18, userSingle)
    then
    res.setResult("A","红色A");
    end
rule "红B"
when
    Policy(sex == "男", age < 18, !userSingle)
    then
    res.setResult("B","红色B");
    end
rule "红C"
when
    Policy(sex == "男", age >= 18, age <= 30, userMarry)
    then
    res.setResult("C","红色C");
    end
rule "红D"
when
    Policy(sex == "男", age >= 18, age <= 30, !userMarry)
    then
    res.setResult("D","红色D");
    end
rule "红E"
when
    Policy(sex == "男", age > 30, userParenting)
    then
    res.setResult("E","红色E");
    end
rule "红F"
when
    Policy(sex == "男", age > 30, !userParenting)
    then
    res.setResult("F","红色F");
    end
rule "黄A"
when
    Policy(sex == "女", age < 18, userSingle)
    then
    res.setResult("A","黄色A");
    end
rule "黄B"
when
    Policy(sex == "女", age < 18, !userSingle)
    then
    res.setResult("B","黄色B");
    end
rule "黄C"
when
    Policy(sex == "女", age >= 18, age <= 30, userMarry)
    then
    res.setResult("C","黄色C");
    end
rule "黄D"
when
    Policy(sex == "女", age >= 18, age <= 30, !userMarry)
    then
    res.setResult("D","黄色D");
    end
rule "黄E"
when
    Policy(sex == "女", age > 30, userParenting)
    then
    res.setResult("E","黄色E");
    end
rule "黄F"
when
    Policy(sex == "女", age > 30, !userParenting)
    then
    res.setResult("F","黄色F");
    end  

public class ApiTest {
    private KieContainer kieContainer;
    private Policy policy;
    @Before
    public void init() {
        // 构建KieServices
        KieServices kieServices = KieServices.Factory.get();
        kieContainer = kieServices.getKieClasspathContainer();
        policy = new Policy();
        policy.setSex("男");
        policy.setAge(16);
        policy.setUserSingle(false);
        policy.setUserMarry(false);
        policy.setUserParenting(false);
        System.out.println("决策请求：" + JSON.toJSONString(policy));
    }
    @Test
    public void test_drools() {
        KieSession kieSession = kieContainer.newKieSession("all-rules");
        kieSession.insert(policy);
        Result result = new Result();
        kieSession.setGlobal("res", result);
        int count = kieSession.fireAllRules();
        System.out.println("Fire rule(s)：" + count);
        System.out.println("决策结果(Drools)：" + result);
        kieSession.dispose();
    }
}

决策请求：{"age":16,"sex":"男","userMarry":false,"userParenting":false,"userSingle":false}
Fire rule(s)：1
决策结果(Drools)：B|红色B