@Order in Spring

spring/spring-order-annotation/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.javadevjournal</groupId>
+    <artifactId>spring-order-annotation</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>spring-order-annotation</name>
+    <description>Spring @Order annotation example</description>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.3.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+
+</project>

spring/spring-order-annotation/src/main/java/com/javadevjournal/SpringOrderAnnotationApplication.java

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+package com.javadevjournal;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringOrderAnnotationApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringOrderAnnotationApplication.class, args);
+    }
+}

spring/spring-order-annotation/src/main/java/com/javadevjournal/car/Car.java

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+package com.javadevjournal.car;
+
+public interface Car {
+
+    /**
+     * This method is responsible for recommending car to customer based on our algorithm
+     * @return Recommended car
+     */
+    String getCarRecommendation();
+}

spring/spring-order-annotation/src/main/java/com/javadevjournal/car/Honda.java

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+package com.javadevjournal.car;
+
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+
+@Component
+@Order(2)
+public class Honda implements Car {
+
+    @Override
+    public String getCarRecommendation() {
+        return "Honda";
+    }
+}

spring/spring-order-annotation/src/main/java/com/javadevjournal/car/Toyota.java

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+package com.javadevjournal.car;
+
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+
+@Component
+@Order(1)
+public class Toyota implements Car {
+
+    @Override
+    public String getCarRecommendation() {
+        return "Toyota";
+    }
+}

spring/spring-order-annotation/src/main/java/com/javadevjournal/car/UsedCar.java

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+package com.javadevjournal.car;
+
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+
+@Component
+@Order(Ordered.LOWEST_PRECEDENCE)
+public class UsedCar implements Car {
+
+    @Override
+    public String getCarRecommendation() {
+        return "Certified Car";
+    }
+}

spring/spring-order-annotation/src/test/java/com/javadevjournal/OrderAnnotationTest.java

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+package com.javadevjournal;
+
+import com.javadevjournal.car.Car;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.List;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class OrderAnnotationTest {
+
+    @Autowired
+    private List<Car> cars;
+
+    @Test
+    public void test_spring_order_annotation(){
+
+        assertThat(cars.get(0).getCarRecommendation(),is(equalTo("Toyota")));
+        assertThat(cars.get(1).getCarRecommendation(),is(equalTo("Honda")));
+        assertThat(cars.get(2).getCarRecommendation(),is(equalTo("Certified Car")));
+    }
+}

spring/spring-order-annotation/src/test/java/com/javadevjournal/SpringOrderAnnotationApplicationTests.java

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+package com.javadevjournal;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class SpringOrderAnnotationApplicationTests {
+
+    @Test
+    public void contextLoads() {
+    }
+
+}