What is Spring DI with a static factory method that returns the instance of another class?

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What is Spring DI with a static factory method that returns the instance of another class?

What is Spring DI with a static factory method that returns the instance of another class?

What is Spring DI with a static factory method that returns the instance of another class?

pom.xml

<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%20http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ram.core</groupId>
    <artifactId>SpringDemo</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>SpringDemo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>5.0.2.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!-- Spring 5 dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>
</project>

Animal.java

package com.ram.model;

public interface Animal
{
    public abstract void eat();
}

Cow.java

package com.ram.model;

public class Cow implements Animal
{

    public void eat()
    {
        System.out.println("Cow eats grass..");
    }

}

Dog.java

package com.ram.model;

public class Dog implements Animal
{

    public void eat()
    {
        System.out.println("Dog eats chicken bone...");
    }

}

AnimalFactory.java

package com.ram.factory;

import com.ram.model.Animal;
import com.ram.model.Dog;

public class AnimalFactory
{
    public static Animal getAnimal()
    {
        return new Dog();// return any one instance, either Dog or Cow
        // return new Cow();
    }
}

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">

    <bean id="animal" class="com.ram.factory.AnimalFactory"
        factory-method="getAnimal">
    </bean>

</beans>

App.java

package com.ram.core;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ram.model.Animal;

public class App
{
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "applicationContext.xml");

        System.out.println("---------------------------------------");

        Animal animal = (Animal)context.getBean("animal");
        System.out.println(
                "Got " + animal +" object from the ApplicationContext[Spring Container]");
       
        animal.eat();
    }

}

Output

Jul 05, 2018 9:24:36 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Thu Jul 05 09:24:36 IST 2018]; root of context hierarchy
Jul 05, 2018 9:24:36 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
---------------------------------------
Got com.ram.model.Dog@3ffc5af1 object from the ApplicationContext[Spring Container]
Dog eats chicken bone...

Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_DI_StaticfactoryMethod_another_class.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_DI_StaticfactoryMethod_another_class

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/87c44fe2f8e6bec23f023e02860b09f4be9b1bfd/Spring_2018/SpringDemo_DI_StaticfactoryMethod_another_class/?at=master

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